NAD Silver S300 Radio News 1935 12

User Manual: NAD Silver S300

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]ADIO
NEWS

DECEMBER
25¢
IN CANADA 300

AND

SNORT WAVE RADIO

FIGlI IIIVG

CRIME
with
RADIO

ÑS!TSYO
A Publication Devoted to
Television
Set Building
Experiments
Short Waves
Amateur Activity

Bui L

Progress in Radio

DX Reception

Broadcasting
Applications

Service Work

Engineering
Measurements
Electronics

GENERAL

Lieu/

6 ELECTRIC

aim-40/

HE SENTRY BOX unit includes the
tuning condenser and dial mechanism as well
as the coils and switch compartments. Separate coils are used for each circuit and no
tapped coils are used. A unique type of construction permits shortest possible leads
coils are mounted directly on their respective
band change switches. Separate shielded
compartments house the R.F., detector and
oscillator circuits. The result is efficiency and
stability in performance heretofore impossible of attainment.
Permanence of circuit alignment is assured
by the use of the PERMALINER trimmer
a new air-dielectric trimmer,
capacitor
sealed against moisture and dirt.

A cut -away view of the underside of SENTRY BOX
showing coil mountings and PERMALINERS. Note
the clean wiring and short, rigid leads.

MODEL A -82. A production broadcast receiver, yet built like a
commercial communications instrument. Eight Metal Tubes
Four Reception Bands
Sentry Box
Permaliners
Stabilized Dynamic Speaker
Sliding -rule Tuning Scale
CW Oscillator may be added.
Lo -note Compensation

$94.50

(Eastern List Price)

GENERAL

ELECTRIC

liacAoL.
www.americanradiohistory.com

1935

RADIO NEWS FOR DECEMBER,

321

Now ¿JIp"Ot Xm a qo0et Joe
OH, NOT SO GOOD BILL,
BUT IM STILL HAVING FUN

GEE, THERE'S DJ C IN
BERLIN. THAT'S THE TENTH

FOREIGN STATION
TONIGHT. RADIO
-

NO,

PLAYING WITH RADIO.
MELLO

AM LUCKY. TOM, EUT YOU
HAO THE SAME CHANCE.
REMEMEER MOOT A YEAR ASO
I SHOWED YOU A BOOK FROM
NATIONAL RADIO INSTITUTE THAT
TOLD ABOUT WE OPPORTUNITIES
AND BIG FUTURE IN RADIO AND
HOW OTHERS NAD SUCCEEDED

TOM. EVE BEEN TOO BUSY MAciNG
GOOD MONEY OUT OF RADIO TO
SPEND TIME PLAYING" WITH IT.

HADDJ.CLAST NIGHT

TOM,

ON A LITTLE SET I BUILT.
IS RADIO STILL YOUR

WOWS EVERYTHING'

SI
SURE LUCKY.
NOTICED YOUR SWELL CLOTHES

HOBBY TOO'.

AND SNAPPY CAR. I THOUGHT
YOU NAD INHERITED A MILLION.
TELL ME ABOUT IT.

SURELY FUN.

TNbU6H THEIR HOME TRAINING? REMEMBER,I TRIED
TO GET YOU To ENROLL
TOR THEIR COURSE WHEN

na or

rDID.
I

r1Di-

_aLf

WELL, IT WAS THE SMARTEST MOVE 1
EVER MADE. PM DONS SWELL. MARY AND
I ME TO BE MARRIED NEST MONTH. TOM.
WHY DON T YOU SNAP OUT OF IT'. DON'T
STAY IN THAT DREARY LOW PAY JOE ALL

THEN
IF BILL
SUCCEEDED
I

CAN

,Oa

INSTALL AND
SERVICE LOUD
SPEAKER SYSTEMS

CAN MAKE

REAL MONEY

SERVICING
RADIO SETS

TOO;

OR MAKE 5000 MONEY
IN ANY ONE Or THE MANY
OTHER NEW AND OROWIN6
BRANCHES OF RADIO.
THERE'S No END OF GOOD
JOBS FOR A TRAINED

RADIO MANI
SIR. IM 601116
PoR THAT FREE
AND GET THE

YOUR LIFE. RADIO IS MORE TIAN A
PLAYTNINO. IT'S A BIG BUSINESS. ITS
YOUR OFgaruNITY. TARE MY TIP. IT
ISN'T TOO LATE. RADIO IS STILL

RIGHT

N.R.I. TRAINING

YOU CERTAINLY

KNOW

RADIO.

CERTAINLY PAWS. I
JUST STARTED A FEW
MONTHS AGO AND I'M

MINE NEVER
SOUNDED BETTER

MAKING 6oOD MONEY
ALREADY. THIS SPARE
TIME WORK IS SWELL

YES,
T0

SEND

FUN. AND SOON I'LL
bE ALL SET

BooK.
DOPE

FOR A
GOOD

NOW!

VOUnU AND GROWING.

ON,TOM, ITS

FULL
TIME

OUR WORRIES ARE OVER.

WONDERFUL

IM MAKING GOOD MONEY NOW,
AND THERE'S A BIG FUTURE
AHEAD FOR US IN THIS
LIVE WIRE RAD /O

TOTNINK HOW FAST YOU'VE

GONE AHEAD SINCE YOU
WENT INTO RADIO. WE
NEVER COULD NAVE GOTTEN
MARRIED ON WHAT YOU
WERE GETTING BEFORE.

FIELD.

a
1

!will help you start
spare time or full time Radio

service business Without Capital

Many Radio Experts Make
$30, $50, $75 a Week

THAT N.R.I. MEN

HERE'S PROOF MAKE GOOD MONEY

The World -wide use of Radio re. eel ears has made hundreds of opportonit lee for good spare time or foil tIme
It,W10 bnsincsses. Many of the twenty million Radio sets are only 25% to 40n,ó efficient.
I will show
!m how to rash in an this condition. I will LIa in you to install and servire all types of receiving
shoo' you how to make enough money while learning Radio to start your own
-cis in afar° time.
service business.
Clip the coupon.
Get my free book, "Rich Rewards In Radio."
Read how
hundreds of N. R. I. men have made good money in spare time or full time businesses.
Many Make S5, $10, S15 a Week Extra in Spare Time While Learning
The day you enroll I start sending you Extra Money Job Sheets which quickly show you holy
I give you plans and ideas that
do Radio repair jobs common in most every neighborhood.
have made good spare time money for hundreds of fellows.
My Course is famous as "the
I
Course that pays for itself."

l'll

BUSINESS PAYS S300 A MONTH

now have my own Radio business whlrh shows three
hundred dollars a month profit- thanks again to N.
R. I. The N. R. I. Corse is a bargain at many more
times than its actual cost. " -FRANK
IRPEESE. 222 S. GOtls

Patna.

540 to 5100 A

St., Philadelphia.

Get Ready Now for

am servi riot laoadrmt, silt., Radios and electrical
1 larve run from $40 as
a11DlEa°res IO spare time.
high as $100 a month. My Radio work equals and
often exceeds my regular salar'."-J01IS J. IHEIDE R,
536 Dayton Ave., St. Paul, Minnesota.

that my training is pract irai,
Money-making Information, that it Is
erse to uuderatand -that it is just
what you need to neater Itadlo.
My
sample lesson text. "Radio Receiving
Troubles -the Cause and Remedy"
avers a long list of Radio receiver
troubles lu A. C.. D. C.. battery, uniDrove

versal, auto. T. R. F., super- heterodyne. all -nave. and other types of sels .
reference system
, v u The
.

oln

l cti,

°pH

nedy the
set trouble.. A
faction
devoted t receiver
n. ahmment»Jnnc
t I t r
d
Get this leaen

teat..

Business of Your Own and Jobs Like These

'
'
''

year. Dealers and jobbers. employ servicemen, salesmen. buyers, managers. and
tells about these and other opportunities.

Pay uP to $75 a week. My Free Book

GET MY FREE LESSON
on Radio Servicing Tips

ois

In just about 15 years, Radio's growth has created over 300.000 lobs. Thousands of opportunities will be opened by new Radio developments. Broadcasting stations use engineers, operators. station nlanngets and pay up to 56.000 a year. Manufacturers ells it l'
testers, insperirws. foremen. engineers, servicemen, buyers. for jobs paying up to $7, S011

MONTH IN SPARE TIME

I'll

.4I
9

oil 0sa.

Television, Short Wave, Loud Speaker Systems Included

There is opportunity for you in Radio. Its future Is certain. Television. short
'e, loud speaker systems. ship Radio. pollee Radio, automobile Radio.
every branch, developments and improvements are
aviation Radio
taking place. Hero is a real future for thousands of men who really
know Radio -men with N. R. I. training. Get the training that fityou for good pay opportunities and success in this growing industry

-In

Find Out What Radio Offers You

you satisfactorily that I
I
agree in writing to refund every penny of yyour tuitlml
if you are not satisfied with my Lesson and Instruction
Service upon completion. Get my 04 -page book of faet,.
It's free to any ambitious fellow over 15 years of age.
qc
It tells you about Itadio"a opportunities; about ms
Course: what others are doing and earning. Find
out what Radio offers you. No obligation.
ACT NOW! Mail coupon in an envelope. or
paste it on a lc postcard.
am so sure N. R.

can

train

President
Nat'l Radio Institute.- Dept. SIR
Washington, D. C.
J. E. SMITH,

MAI L T H I Slot FREE 64 page book

1 eY

WIN

°tick

D4`

°4eß a..i.* o

°ß.ho3

.II

SaSko-

°JOa

`'G

ova3
PGA

Edited by
S.

LAURENCE

GORDON TAYLOR

Managing Editor
Jouw M.

MARSHAlt

WILLIAM C. DORF
Associate Editor
JOHN

BORST

Technical Editor

COCKADAY

Assoc.

H. Porra

Tech. Editor

JOSEPH F. ODENB.ACH

Art Editor

N-u1.

XVII

December, 1935

`Heading Guide
to this IssueAs a matter of convenience for
those having specialized interests
in the radio field, the following
lists the articles and features in
this issue, classified under 14
heads. The numbers correspond
with the article numbers in the
Table of Contents on this page:

AMATEURS-2. 3, 4, 6. 7. 8, 9, 10,
11, 1:3. 16. 17. 10. 24, 25, 27, 2S
BROADCAST FANS-:3, 4, 5, 14, 13,
17, 18. 21

DEALERS -3, 4, 7, s, 12, 16, 17, 20,
22, 23.27
DESIGNERS -2, 3, :5, 9, 10, 11, 13,
17, 27
DX FANS-3, 14. 15, 17, 18
ENGINEERS-2, :3, 4, 5, 9, 10, 11,
13, 17, 27

EXPERIMENTERS-1,

3, 4, 5, 7, 8,
9, 10 11, 13, 15, 16, 17, 18, 19, 24,
27. '2t
4, 5, 11, 27
MANUFACTURERS
OPERATORS
6, 26
3. 4, 5, 7, 9, 10,
SERVICEMEN
11, 12, 13, 16, 17, 18, 20, 22, 23, 24,

-2,
-1,

-2,

SET BUILDERS -3, 5, 7, 9, 10, 12,
13. 15, 113 17. 13, 20, 22, 23, 24, 27
S. W. FANS-3, 4, 6, 7, 16, 17, 18, 19,
20,

2.5, 28

STUDENTS-I,

33 4, 5, 7, 8. 9, 10, 11,
12, 13, 16, 17, IS, 20, 22, 23, 24, 27,

TECHNICIANS -2. 3. 4. 5. 0. 7. 9,
la, I1, 12, 13, 16, 17, IS, 22, 23, 24,
27

A Serviceman's Diary

Anonymous 324

Fighting Crime with Two -Way Radio
What's New in Radio

Victor Hall 327

The January issue will introduce a constructional article on a
"Ham" receiver, par excellence!
The receiver to be described was
especially designed and custom
built for Henry B. Lockwood,

owner of amateur station

W2HFS, Mt. Vernon, N. Y., to
meet his extremely rigid requirements of sensitivity, selectivity,
stability, dependability-and above
all -high signal -to -noise ratio.
It is an 8 -tube superhet which
leaves nothing to be desired by
the discerning "ham" who can
afford to spend a medium price
and has the technical ability to
build his own receiver.

Published Monthly by
Lee Ellmaker
President and Treas.
B. Holcepl
Secretary
H. D. Crippen W. P. Jeffery
Advertising Management

Virgil Matcher

205 W. Wacker Dr., Chicago
Western Representative

William C. Dorf 329

Farnsworth Cathode -Ray Television
Samuel Kauf ratan 330
5 Cathode -Ray Magic "Eye"
Merle Cummings 331
6 The "Ham" Shack
Everett M. Walker 332
7 "Ham" Receiver with Dual Regeneration
McMurdo Silver 333
8 5 -Meter DX Tests
L M. Cockaday 334
9 New Acorn Pentode
J van Lienden 335
10 Impedance Matching Calculations (Part 4)
C. A. Johnson 336
11 Talking Light -Beans Receiver
C. A. Johnson & V. Sharp 337
12 Selling Service
A. A. Ghirardi & T. S. Ruggles 338
13 Metal Tube Data
John M. Borst 339
14 Broadcast Station List (European)
Technical Editor 340
15 The DX Corner for the Broadcast Band
S Gordon Taylor 342
16 "Ocean Hopper" Short -Wave Receiver (Part 2). ..John H. Potts 345
4

"Observer" All -Wave Converter.. Cockaday. Benner & Browning
New All -Wave Tuner
Richard Feeney
The DX Corner for Short Waves
Laurence M. Cockaday
World Short-Wave Time -Table
The Editor

Backstage in Broadcasting

The Service Bench

Service Contest Awards

Coming-

No. 6

Students' Radio Physics Course
25 Captain Hall's Short -Wave Page

27
28

QRD?
The Technical Review
Code Practice Schedules

Teck Publications, Inc.,

346

347
350
352

Samuel Kaufman 358
Zeh Bouck 360
The Contest Editor

362

Alfred A. Ghirardi 364
Horace L. Hall 366
By GY 370

Robert Hertzberg 372
Amateur News Editor 377

Washington and South Avenues, Dnae!len, N. J.
EDITORIAL AND EXECUTIVE OFFICES
461 EIGHTH AVENUE. NEW YORK CITY, N. Y.
25c a copy.
Subscriptions:
$2.50 a year, $4.00 for two
Entered as second class matter at the Post Office at Dunellen.
N. J. under the act of March 3, 1879.
years. In Canada and Foreign
Copyright, 1935, by
Teck t'ublications, Inc. in U. S. and Canada. All rights reserved.
Countries $3.00 a year, $5.00
Registration f title of this publication as a trade mark applied
for two years. Subscribers are
for in United States Patent Office. Printed in the United States
notified that change of address
of America. The contents of this magazine must not be repro.
must reach us five weeks in
duced whhout permission.
We cannot be responsible for lost
advance of the nest date of
manuscripts, although every care is taken for their safety.
issue.

322
www.americanradiohistory.com

RADIO NEWS FOR DECEMBER,

That's what
it's built for!

323'

1935

That's what
you'll get!

_._.

SILVER
MASTERPIECE IN

2SSTARTLING
ENGINEERING
ADVANCEMENTS

Tried and tested by critical owners the world over ... years
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every conceivable reception condition. Truly, it has proved itself
to be the "Rolls-Royce" of radio . . , the finest receiver of all time!
Engineered to achieve certain definite results -not merely "tricked
up" to provide a background for intriguing words and phrases
McMurdo Silver's latest and greatest MASTERPIECE is everything
the name implies. That's why we can dare to offer it under a definite
guarantee that it must prove its superiority in comparison with any allwave receiver at any price, with you the sole judge, as have been
users from the F.C.C. to broadcasters, engineers and DX champions.

19 Tubes, providing twenty -three distinct tube functions.
Perfected Circuit.
Unmatched Flexibility of Control.
Unequalled freedomfromnoise.
Selectivity, extreme and variable.
Unmatched Tone Quality.
Double High Fidelity.
35 Watt Undistorted Output.
Amplified Automatic Volume Control.
Airplane Dial with 5 accurately calibrated tuning scales.
Band Spread Tuning.
2 Tuned R.F. Stages on all 5 bands.
Air Dielectric Trimmer Condensers
throughout.
No -loss R.F. Inductances.
All R.F. and I.F. circuits Air Tuned.
Doubly Amplified Tuning Meter.
Calibrated Sensitivity Control.
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Public Address and Phonograph Operation.
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Two Matched Speakers.
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features which have
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Try the MASTERPIECE IV for 10 days in your own home
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...

R9 -I- ANTENNA

The new 119 + Antenna not only eliminates noise, but increases volume of all s. w. stations from 4 to S times. Easy to put up, and costing
only $8.85 net, it is the first tuned short wave antenna available. It's
like adding a stage or two of r. f. to any standard all -wave receiver!
Check and mail the coupon for complete details.

MEMURDO SILVER CORP.
Division of

3352

N. Paulina Street

G. P. H.

SIEN.)

TO11D2V`f
for Free

"BLUE
BOOK OF
RADIO"

McMURDO SILVER CORPORATION
3352 N. Paulina Street, Chicago, U. S. A.
Send Free "BLUE BOOR" giving complete specifications of MASTERPIECE IV, with details of 10 -DAY TRIAL
O Send description of R9 + Antenna.

Name..._
Address

Inc.

Chicago, U. S. A.

www.americanradiohistory.com

City

State

12 -RÑ

RADIO NEWS FOR DECEMBER,

1935

Pages From

"We are happy
to recommend this job!"

eY`UZCeY12ClYl S

D IA R Y
WEDNESDAY- Arrived early.
Off to calls.

SAY

RADIO NEWS

EXPERTS
After Exhaustive Tests
AFTER o week of testing. Mr. Cockaday and
and his experts gave the Super Skyrider

the following enthusiastic endorsement. (See
Radio News, November, 1935) "I find this receiver eminently satisfactory from a communicaiion standpoint and with acceptable tone
quality
.
the receiver actually is a first.
class communication job .
.
I
am happy to
recommend this job to . any amateurs who
want a modern up -to -date and thoroughly
satisfactory receiver for this special class of
.

service."

IRON CORE I. F.

Mach of the high degree of .enit ìvity found
Super Sky Rider I. due to its Iron
foMe
re I.F. Y.tero. of which Mr.
r!Y.. The high degree of sensitivity in th,e
receiver was. of coures. obtained through the
om f iron e
intermediate frequency
forme.. ued with high gain meut
tuber. I predict that the neat general
nnprov aunt in reeeiler design will be the
of iron
thtransformer..

Iki.pereceiver

refore

anions American Receivers. d the cooling
tyre of re.oser in thu .1:,...

* *

Such endorsement from a man in Mr. Geckoday's outstanding position in the radio world
is indeed praise from Caesar.
It is ample
evidence of the really marvelous prformance
of the Super Skyrider and its ability to get
any signals wanted at any time.
See the Super Skyrider at your dealer's today. Examine it, note its compact construction, its convenience. Its very appearance
speaks of precision engineering.

Complete
everything in one
Convenient-modsingle cabinet
ern band changing switch, no inControlled
convenient plug -in coils
Crystal Filter Circuit gives absolute
Tone Conone -signal selectivity
trol
Metal Tubes- increase gain

eliminate tube shield noises
tuning charts required -it's
the dial
Beat Oscillator
Electro- Mechanical Band Spread.

and

No
all on
SEE

THESE

FEATURES
DEALER'S.

YOUR

THE HALLICRAFTERS INC.
3001 -V

SOUTHPORT

AVE.

CHICAGO.

ILLINOIS

www.americanradiohistory.com

Number One-Stromberg 635,
magnetic speaker. Complaint : won't
work. Turned on set. Tubes light. Removed 45 tube. No sound in speaker.
Removed speaker cord tips from set
and connected same across pilot -light
socket terminals. No sound. Removed
unit and found armature broken.
Brought to shop to replace armature.
Number Two-Philco 11 -tube all wave. Complaint: can't get Europe!
Loaded up with noise- reducing aerial
material and started off. Found set in
very noisy location. Usual broadcast
type antenna and installation. Installed
20 -foot doublet with twisted -pair lead -in.
Connected lead -in to coupler and attached set. Still noisy. Removed
coupler and connected transmission line
direct to antenna and ground posts on
set. Tuned to London and it came
pounding in with little background noise,
to the astonishment and delight of all
concerned (including me). Tuned to
local broadcast. Weak and noisy! Connected both sides of transmission line to
antenna post. Locals O.K. Installed
single -pole, double -throw switch so the
customer could connect transmission
line either way.
Number Three- Stromberg 12. Complaint: howls when first turned on. Expected sour 45 -tube and was not
disappointed. Cleaned condenser rotor
contacts, replaced worn lead -in strip and
tightened ground clamp. Off to next
patient.
Number Four -Stromberg 642. Complaint: fades at times. Listened patiently (if wearily) to the stock phrase,
"(When the doctor arrives, the pain disappears." Set operating O.K., of course.
Antenna and ground, O.K. Tapped
tubes; O.K. for noise. Pounded chassis. Nothing happened. Checked volume- control operation carefully. Slightly
oisy in one spot. Connected up oscillator, using an unmodulated carrier, rechecked volume control. Rough action
now very apparent. Found bad spot
coincided with normal room volume position when receiving stations which
caused most trouble. Got customer's
O.K. for volume- control replacement
and shop overhaul. Pulled chassis and
returned to shop.

THURSDAY-Arrived early at yacht
harbor with complete equipment to service a yacht job reported last week.
Philco Transitone. Owner wanted hookup changed so his batteries would be
under equal load. Saved me one trip
by explaining that he had a 32 -volt
Delco system with the radio hooked
across one battery only. Took along
the fat resistor I had ordered and went
aboard. Installed resistor in series with
32 volt line: -Set noisy! Rechecked with

RADIO NEWS FOR DECEMBER,

THESE records from

325

1935

an anony-

mous serviceman's diary should
be of decided interest to veteran
servicemen, as well as to those
whose experience in the service
field is more limited. Written by
a man who "knows his stuff," and
shot with an occasional outcropping of humor, these items provide many hints not found in text
hooks. More of these pages will
appear from time to time.

battery. Still noisy. Turned
Still noisy!
volume control.
Removed chassis and replaced usual
cause of trouble, the first a.f. transformer, and re- installed. O.K.!
Stopped off on my way back to shop
to look over an A. K. 627. Complaint:
distorts. Checked set. Volume control
slightly noisy. 47's weak. Replaced
47's. Still distorts slightly. Removed
to shop and checked thoroughly. Everything O.K.. except volume control. Replaced volume control. Distortion cured.
6 -volt

down

FRIDAY-Ho, hum! Another day.
Got to get going!
Number One -Stromberg 29. Cornplaint : weak reception. Found normal
deflection of tuning meter when tuning
to resonance with local broadcast signals.
Turned chassis upside down and gave it
the once -over visual inspection which
often saves so much time. Found 10,000ohm resistor, connecting to speaker
receptacle, badly overheated, the lacquer coding having flaked off in spots.
Traced lead from resistor to .3 condenser in by -pass condenser block, removed lead from condenser terminal
and checked condenser with ohmmeter.
high Showed reading of 1500 ohms
resistance short -circuit. of course Replaced this condenser with a good 400 volt type by -pass, and on second
thought replaced the .3 by -pass in the
tuning meter circuit also. although it
tested O.K.
Next -An A. K. 37. Complaint fades.
noisy. Found filament voltages low on
Tightened terminal nuts,
the 26's.
bringing voltage up to normal. Volume
control noisy. Found winding O.K., so
removed moving arm, cleaned all arm
contact surfaces with garnet paper, increased tension and polished flat phosphor- bronze strip connecting to middle
terminal of volume control and reassembled. O.K.
Next-Victor 9 -54 combination. Complaint: radio squeals. phonograph N.G.
Found set unstable but operating fairly
well below 1000 kc. Slight i.f. and
considerable r.f. oscillation at high -frequency end of scale. Readjusted r.f.
feed -back condenser. No effect Checked
voltages. First detector plate. 160 volts
-too high Removed S.P.U. Found
open 1000-ohm section in voltage divider. Removed gang condenser, aligned
and neutralized i.f. amplifier. Reassembled complete. Radio now O.K.
Tried "phono" section. Pushed record changer starting switch. No results.
Pushed turntable tentatively and mechanism operated O.K.

-a

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-a

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guaranteed merchandise.

WHOLESALE RADIO SERVICE CO., Inc.
100 Sixth Avenue, Dept. N-125
New York. N. Y.
Please rush FREE copy of your new 1936

Catalog No. 59.
Name
Address
t

Town

State.

KOLESALE RADIOSERVICE Oi

NEW YORK.N.Y
100 SIXTH AVE.
CHICAGO, ILL.
ATLANTA, GA.
901 W JACKSON BLVD.

430W PEACHTREE ST NW

Also at 542 E. Fordham Road, Bronx, N. Y., and 219 Central Ave., Newark, N. J.

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Commerce Air of Department and Corps Air Army States United the to Contractors

CORP. AVIATION. BENDIX OF SUBSIDIARY
Ohio Dayton,

Place Sunrise 125

CO. PRODUCTS RADIO THE
DETAILS FOR WRITE
L

MANUFACTURERS TUBE ALL OF APPROVAL MEETS
tubes metal testing for needed are
switches selector special no Remember,

tubes metal all for

flexibility Complete

TESTERS SET 58 SERIES
meters

low as bands fundamental With

GENERATORS SIGNAL

TESTER TUBE
oAÿRAo
SYSTEM INDEX NEW

AAD
1935 DECEMBER,

FOR NEWS RADIO

326
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December, 1935

Çjighting Crime
with

TWO-WAY RADIO
No longer has the professional criminal all of the advantages of modern science
aiding him in his illicit pursuits. Radio is a weapon that the modern police officer
relies on more and more each year. And now 2 -way police radio steps in to
give the forces of law and order the upper hand, so that the criminal, even with
his high -powered automobile and machine guns, has nowhere to turn without the
eyes, ears, and strong arms of the law ready to reach out and pull him down
Three calling headquarters
By Victor Hall
patrol, listening intently, hears:
Car Three calling headquar"Attention all cars
Attention all
Kay."
ters
Man discovered stabbed . . .
cars
Kay."
Front Street near Main . . . City Hospital ambulance
"O. R., Car Three
Go ahead
May be dead
"Reporting man discovered stabbed
Keep lookout for suspicious persons . . .
being called
Front Stréet near Main
Need ambulance . . .
Halt suspected cars . . . (The telephone at Dobson's
Will report for identification after further examination
elbow rings; its bell sounds faintly in every car) .
Kay."
Stand by a moment . . . (Dobson turns away to his
It is two A. M. Most of the city's 100,000 are asleep.
phone; in the cars, his voice fades, remote and muffled;
But not all! Lights still burn in the Daily Gazette office.
then at the first words he hears, Dobson shoves the telephone
Out on Route 14 the Pine Tree Inn orchestra plays its
close up to the microphone and what he says suddenly
closing number. In the
becomes clearly audible
swanky Rosedale section
again in the police cars)
THEY SAW, THEY HEARD, AND NOW THEY SPEAK!
the last bridge parties are
You're calling from
The new 2 -way police radio installations being rushed into the
breaking up. And quietly
Lacy's drug store, eh?
police cars of leading cities of the United States are enabling
law officers to keep in touch with other police cars and uith
nosing around town are
Saw three men fighting
headquarters so that reinforcements can be called upon and
the cars of the police mo. You say two of them
the criminals headed off during the actual chase. Getaways
tor patrol.
jumped in a car on Main
seldom exist nowadays.
In Car Five, Patrolmen
Street
Didn't get the
McFee and Elton idling
license number . . . An
along State Street have
open car, eh? . .. tan coljust passed an open car
ored?
They drove off
heading leisurely out of
West!
."
the business section. They
Out on State Street Mceyed the two men on the
Fee and Elton stiffen up.
front seat, automatically
Two men-open car-tan
noted the car was tan colored. McFee is spincolored and continued on.
ning his wheel, shifting
At headquarters, Sergeant
gears, backing, turning,
Dobson was sitting at the
and as Dobson finishes his
microphone about to send
message
. keep look -.
out the two o'clock time
out . . . these men may
signal when his receiver
be armed
Time twospoke up and Car Three
four
.
Dobson
made its startling report.
Kay," Elton grabs the
Now Dobson leans fortelephone off the dash
ward and addresses his
board.
microphone and the night
"Car Five calling
.
.

...

...
...

...

327
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328

RADIO NEWS FOR DECEMBER,

1935

That pattern is such that five of the
discs now lie athwart five roads leading
from Rosedale.
The black one -where will it turn
next? That question the Sergeant and
the men listening in the patrol cars
blocking Rosedale ask themselves. They
have but a few instants to wait and
then comes:
"Five calling.... Elton in Five calling.... Runaway car fired at us... .
McFee hit.... Ought to have attention
quick.
. Can't follow. .
. Tan car
turned right into Hillside Street. .
Trying to make Route 14 that way...."
The Sergeant snaps to the microphone, gives more orders. He returns.
to his map, moves the black disc sharply
right and forward and then clusters our
of the shining brass ones close around
it. Only an inch of map space shows
around the black disc now.

Gang Car Ditched
"Car Six calling.... Six calling...
Car Five Calling.... Open tan car with
two men in front seat just passed us
Have
going out. on State Street.
turned around and are following... .
Kay."
Dobson replies: "O. K., Five.
Cars One, Two, Six and Seven, get on
main crossings. .. "
An instant later Elton's voice comes
back: "Car Five calling.... Five calling. .
. Open car turned off on Park
.Avenue.... Is heading through Rosedale, probably for Route 14.... We're
turning into Park now.... They've seen
us.
. They must be the ones. .
They're hitting it up.... Going 65, 70!"
.

At Headquarters
Sergeant Dobson at headquarters suddenly becomes a commander -in-chief
directing the movement of units capable
of obeying at 80 miles per hour. capable
also of telling him where they are, what
they see.
He barks a few words into the microphone, repeats them. repeats them again.
His hands move swiftly over the table
before him. A number of shining little

DISPATCHER ON DUTY
Here is the dispatcher taking down
an actual report from a speeding police car running down the criminals.
The row of lights in the upper right hand corner tells him where every car
is stationed and just which one can
best aid in the capture.
brass discs shift quickly over the map
of the city. Where Five last reported
the speeding car, he places a sombre looking black disc. Out on the highways. the patrol cars move in synchronism with the discs, matching the pattern formed by what an observer might
take to be an odd game of checkers
played single- handed by the sergeant.
INSTALLATION DETAILS
The two illustrations at the left show
the compactness of the transmitter,
with views outside and inside. Below:: How the various other units of
the 2 -way system are placed at strategic points in the car's anatomy.

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Chasing car on Hillside. .
.
Chasing
car on Hillside.
." And a minute
and a half later, "Car Two calling... .
Two calling. . . . Ditched tan car at
entrance to Route 14.
.
Both men
knocked out but not killed.... Shall
we bring them in? ..."
Sergeant Dobson barks more orders
into the microphone and restores all but
three of the brass discs to their normal positions. He picks up the black
disc, drops it with a faint plunk into- a
little box and then relaxes with a sigh.
Frightened calls from Rosedale are
swamping the police switchboard in the
hall: "Say, Officer, I heard some shots."
"Officer, there's been a shooting up
here somewhere."
"Get a man up
here quick, I think I heard some
And the telephone man, glancing at a
message in the sergeant's hand, is replying, "Yes, sir, yes, ma'm, a couple of
hold -up men; we got 'em near the Pine
Tree Inn...." Thus 2 -way police radio,
latest weapon in the hands of the police
for fighting crime.
One -way police radio -namely, equipment for transmitting from headquarters to patrol (Turn to page 378)

..."

RADIO NEWS FOR DECEMBER,

329

1935

WHAT'S

eW
Zf2

RADIO
Yes, there is something
new in radio! On this

and the following pages
you will find important
inside information in
our descriptions of and
tests on the metal tube
sets, parts and accessories

By William C. Dorf
A New Mike for Police Cars
A hand type microphone has just been

announced by the Universal Microphone
Co. for police cars equipped for two -way
radio communication. The microphone is
fitted with a rubber mouthpiece. It weighs
less than two pounds and comes in single
and double button models.

Dealers See New Receiver Line
The new line of Stewart -Warner "Ferro dyne" receivers equipped with the new
metal tubes, were recently introduced to
the public at a national convention of the
company's dealers and distributors at the
Drake Hotel in Chicago.

Circular Slide Rule
The Tavella "Mascot" vest -pocket slide
rule shown, offers the dual advantages of
far greater compactness and greater scale
length (and therefore accuracy) than slide
rules of the ordinary type. Also its cost,
complete with leather case, is only a fraction of the cost of straight rules. It is
unbreakable and the sharp black graduations on white celluloid make it easy to
read.
On the front are a "D" scale, a "C"
scale, a "CI" scale and an "L" scale. It
is therefore suitable for the multiplication
of three factors with one setting. Conversions to d.b. can easily be made. Scales
on the back include trigonometric scales
with scales for obtaining squares and
square roots.

RADIO DEVICE ENABLES BLIND PERSON TO READ
There has recently been developed the device pictured above, which converts printed
letters in a book to electronic impulses on a special framework upon which the
blind person places his hands. He soon learns to read these impulses as he would
the raised letter of the Braille system. The device uses photo -electric cells and
other radio parts and was invented in the Physics Department of a Soviet university.

A New Item for Auto Radio
Enthusiasts
A new type spark plug with built -in
resistor for eliminating ignition noise in
auto radios has been recently developed by
engineers of the AC Spark Plug Co. The
resistor unit can be removed and replaced
should it become ineffective, without replacing the entire spark plug.

The Latest in Cathode -Ray
Equipment
The Clough -Brengle Model CRA cathode -ray oscillograph incorporates a built in linear sweep circuit, input amplifiers

and a power supply for operating the
This instru3 -inch cathode -ray tube.
ment used in combination with their
model OM signal generator provides a
modern method for servicing radio sets.

New Small -Size Metal Tube
Rectifier
A new type 5Z4 metal tube, interchangeable with the original cage type
5Z4 metal rectifier was recently introduced
by Hygrade Sylvania Company. The outstanding feature of the new tube is its
reduced size, which the manufacturer
points out was accomplished without loss
of any of the electrical characteristics. The
height of the tube is 334 inches and the
diameter 1 5/16 inches. The filament current drain is 1.5 amperes as compared to
the 2.0 amperes drain of the original 5Z4.
The decreased filament wattage results in

www.americanradiohistory.com

lower operating temperatures. The new
tube will also replace type 5Y3, the glass
rectifier tube incorporating the octal type
base.

An Attractive Metal Tube Set
This three -band 7 -tube set made by the
International Radio Corporation, employs
the new metal tubes throughout and it
(Turn to page 374)

RADIO NEWS FOR DECEMBER,

1935

FYI -IAT YOU CAN SEE
Figure 1: The illustration, above, is a
reproduction of a photograph made of
a received image on the oscillight
tube, which is the heart of the Farnsworth Television system. Figure 5:
The middle picture shows an operator
adjusting the Farnsworth commercial

rack -mounting television equipment.
Figure 3: .41 right of page is Mr.
Farnsworth demonstrating his standard home -type receiver for television
and sound reception.

AST month, RADIO NEws described
the special demonstration given
J for members of its editorial staff
at the Philadelphia laboratories of
Farnsworth Television, Inc. We reported on the fidelity and clearness of
Philo T. Farnsworth's system and the
fact that 10 by 12 inch and 6 by 7 inch
images had been successfully achieved
by the young inventor. Now, in this
second article, we will set forth the
methods as well as the results of the
young inventor's high -definition television tests.

360 -400 Lines
The previous article contained some
skeleton details of this highly advanced
system of image transmission. And we
are now elaborating on the earlier facts
to give a precise picture of the Farnsworth system -one of the most advanced in the world. We might repeat
these few facts before proceeding into
our technical description of the apparatus and methods: The RADIO NEWS
demonstration was conducted on 240
lines. But the inventor intends to increase his system to 360 lines and, and

Ca,r,on. Days are used in Botta

FARNSWORTH
Many experimenters would like to know how the
for picking up the picture as well as for recreating
of the Farnsworth system employing a
still later. to "something in the order
of 400 lines."
An idea of the type of image seen at
our special demonstration is conveyed
by Figure 1. But, you must keep in
mind the fact that photographs are

DISSECTOR AND RECREATOR
Figure 2: Diagram, below, shows
schematically how the cathode -ray
principle is used in the transmitter
and in the receiver. The dotted line
indicates a wire connection, although
these

radio.

impulses are sent easily by
The text explains the various

functions of the circuit.

www.americanradiohistory.com

By Samuel
very difficult to take of the moving images at the end of a cathode -ray tube
and that the same image directly conveyed to the eye registers as being
clearer than the average photograph of
the image. Also. it is apparent that the
eye and brain of the viewer of a television program automatically make allowances for minor imperfections of the
moving image. But the same viewer is
bound to be more critical when gazing
at a still picture of the same image.
Actually, however, a television program
consists of a rapid succession of minute

Rimo

Nk:ws FOR DECEMBER, 1935

331

THE TELEVISION RECEIVER
Figure 7: The view above, of the

-Transmission and Reeception by

ELEVISION
cathode -ray type of tube can be used in television
it. This article explains the mode of operation
number of important and novel features

Kaufman
parts of pictures
reconstruction of
registers itself on
determining the

and it is the efficient
the entire series that
the viewer's mind in
merits of the trans-

missions.

Cathode

The RADIO NEWS group was impressed with the Farnsworth demonstration. And the daily press, too, accorded
favorable comment to demonstrations
at the Philadelphia laboratory. Figure
2 gives the basic schematic outline of
the Farnsworth television transmitter
and receiver circuits, virtually identical

television reception unit comprises the
cathode -ray tube and associated radio
tubes mounted on metal chassis. Figure 4: Center illustration shows a view
(from the back) disclosing the television receiver, at the top; the power
supply, bottom; while the operator
points at the short -wave unit. Figure
6: At the top left of the page is the
Fernsch model using the same principles and manufactured for the German market.

to the apparatus employed at the
Philadelphia press demonstrations. Mr.
A. H. Brolly, chief engineer of Farnsworth Television Laboratories, Inc.,
who jointly with Mr. Farnsworth explained the system to this magazine's
staff, prepared the diagram. The pickup of the transmitter, designated on the
diagram as A has been dubbed the
"image dissector." The light intensities
of an image focused upon its photosensitive surface is converted by the
dissector into fluctuations of an electric current. The scanning system also
embraces its enveloping coil assembly
(B) and the scanning oscillators (C)
and (D). Mr. Brolly pointed out that
their joint duty is to analyze the area
of an image into (Turn to page 375)

kay

VIAGIG

"EYE"
By Merle Cummings
ANOVEL application of a cathode ray tube has been made in the
"Magic Eye" feature of the new
season's RCA -Victor line. The "eye"
consists of a special type tube installed
horizontally in the radio receiver so that
only the dome, with a fluorescent surface resembling the human eye, is visible
through a panel opening. When the set
is functioning, the "eye" blinks forth
with a green light broken only by a tiny
fan of shadow. The spread and contraction of the shadow fan denotes just
how accurately the set is tuned.

THE NEW TUBE AND HOW IT SHOWS TUNING
At the center is shown the new 6E5 tube, with the cathode -ray "eye" at the top of
the bulb. The two outside views show the end of the tube and the indications of
out -of -tune and in -tune positions of the tuning dial.
When the shadow is narrowed to a
thin line, the listener knows definitely
that his set is tuned to the most reso-

nant point. This feature greatly enhances "silent tuning" inasmuch as the
(Turn to page 381)

RADIO NEWS FOR DECEMBER,

1935

the
1A117"
Shack
(I
A WESTERN DX'ER
This is the amateur station JV7EOR
owned and operated by Rex Womack
of Everett, Washington.
to the nation in
times of disasters which cut off normal communication to whole sections of
the country with one sweep, leaving a
trail of havoc and the burden of summoning help on his shoulders, have been
recorded in news columns and radio magazines from time to time. Frequently,
however, their deeds of heroism go unnoticed. It happens that about once or
twice a year an "act of God" hits some
section of the United States and, with
all of the suffering which ensues and the
need for calling help. leaves a devastated
area without its normal means of wire
communication with the "outside" world.

THE amateurs' value

MOST recent of these terrible disasters was the Florida hurricane last
September which left a trail of
death and destruction from the southern
tip of the state, the Keys, sweeping northward along the west coast then turning inland at Cedar Key just south of Tallahassee. Here again the amateur demonstrated his ability to rally to an emergency and come through with a communication job that, alone, brought news of the
suffering in the stricken zone and summoned the necessary help that undoubtedly
alleviated much of the suffering.
Credit for the success of the emergency
communication goes largely to the 75
meter 'phone men who cleared the entire
band and received it exclusively for the
-handling of the emergency traffic. But, to
one "ham" goes a large share of the credit
for his excellent resourcefulness. He is
Fred G. Bassett, Jr., owner of station
W4AKI. With the news of hurricane
sweeping up from the Gulf of Mexico with
the Florida Keys directly in its path, Bassett left his home at Eustis, Fla., on Sunday, September 1, for Matecombe and
Tavernier keys which suffered most severely from the storm. He took with him a
portable transmitter and receiver which run
on battery power. Then from early the
following Monday morning until Wednesday he stuck by his post and broadcast
to the anxious outside world the dramatic
story of the disaster; summoned aid and
directed the manner of its arrival and kept
all Florida informed of the progress of

the hurricane. His messages ran: "Seventyfive dead, forty-seven injured, four doctors
killed -; no medical aid, no food or water,
no medical supplies, no clothing." Thus,
was unfolded the story of the Florida
hurricane.
Bassett, of course, was not alone in accomplishing the feat that will make amateur
history. He was one -one of the principal
.

ones

-of

Department
for the amateur
operator to help him
keep up -to -date

number of Florida stations that

formed an emergency Florida network
which was helped in its work by the cooperation of the entire 75 meter 'phone
band which with the help of policing by
amateurs in other districts, was kept entirely clear of stations excepting only those
handling the emergency traffic.
Activity of the Florida network began
with the first gust of wind that hit the
keys and continued until normal means
of communication was restored. They dispatched news of barometric readings, wind
speeds and relief preparations. As the hurricane gained in force, Bassett found himself the only means of contact with the
stricken zone. Alonzo O. Bliss, W4COT,
working with W4AKI established contact
with state authorities and the Red Cross
and maintained direct contact with the
operator on Matecombe. Bliss handled the
bulk of traffic from and to the Keys and
did an excellent job of it.
Then followed the dramatic story of the
disaster. Amateurs and short-wave listeners all over the country followed it in
detail, many being able to pick up W4AKI
direct. Your Editor, operating his station
at the time, picked up a QST message
from W4BYY in which it was said the
stations in Florida handling the emergency
traffic were receiving severe interference
from stations outside the district, particularly those in the first and second districts. We, along with a number of other
stations, immediately repeated the broadcast. The alarm spread like wildfire. Everyone, of course, was eager to co- operate. The
policing was carried on by W2KR, W2BO,
W3DQ and countless others. Every time
a station opened with a CQ or a call and
apparently unaware of the situation, the
self -des ignated "police" stations jumped
upon him. They all closed down and listened.

A Dramatic Story

The story unfolded was truly dramatic.
Reports of the storm's effect filtered
story from a man whose house
through
had been flattened by the wind with one
blow; the list of dead and injured with
the description of necessary supplies. .
the story of the derailed train.... "Tell
Colonel MacNamara no shelter, no cover
for the injured; situation very bad" .
"Boat with 200 cots, 400 blankets, 40 tents
and complete medical supplies has left by
inland waterways. Should be there in few
. an
hours" . . more weather reports
amateur in Tama is told storm will reach
his city within hour, he replies his family
is being taken care of but he is going to
standby until the wind takes his antenna
down
a message from the Miami Red
Cross: "Several truck loads of food and
medical supplies are leaving. Miami for the
so on until the Florida
keys"
. and
Stations faded out as the dawn arrived over

-a

...

www.americanradiohistory.com

Conducted by

Everett M. Walker
Editor for Amateur Activities
New Jersey -1,500 miles from the scene of
tragedy, destruction, death and need.
An actual account of the Florida amateurs' part in handling the emergency
traffic was prepared by George F. Kendrick, W4COS, of St. Augustine, Fla. This
account, containing more than 1,600 words,
was forwarded by amateur radio by
W4COS to W4CVQ, W. H. Jacobs, of Fort
Bragg, N. C., who himself took part in
the emergency work, and then forwarded
to the writer. W4COS's account follows:
"When the weather bureau advisory was
broadcast at 10 a.m. on Labor Day,
September 4, little did any of the amateur
radio 'gang' in Florida realize the momentous hours to follow. What happened in
the Florida keys that night and the following several days is now history.

"Monday night found the Florida storm network on the job. The Army Amateur 'phone net
of Florida was called by W4WS, M. L. Patterson, the net control station, who requested \V4GO,
A. H. Davis, at Clewiston, to take over the net
control station as he was nearest to the storm
He did, and conarea, and centrally located.
tinned to dö so for nearly sixty hours of continuous operation.
"After finding ont just who was on the air
he turned the job of clearing the 75 meter 'phone
hand over to W4DU, at Jacksonville and
\V4BYY, at Fargo, Ga. At this point W4BYY
called QST and asked that all stations within
the frequencies of 3900 and 3920 kilocycles QRT
or QSY stop transmitting or change frequency,
for that was the area in which the Florida network was working."
At this point W4CVQ at Fort Bragg, X. C.,
hearing this QST offered his services to contact
northern stations and ask their aid in clearing
the channels for the emergency traffic. This offer
was immediately accepted, and a OST (general
call to all stations) was broadcast. The channels first requested were 3900 to 3825 kilocycles
This cleared the
and 3940 to 3960 kilocycles.
channel for \VaARI who was operating on 3945
kilocycles.
"The balance of the 3940 to 3960 channel was
used for clearing traffic north,". says W4CVQ,
"and how traffic could be handled on this clear
channel can best be described by the following
illustration: A message was started in Maine regarding the removing of passengers from the
liner Dixie; this message was handled over the
cleared channel and was delivered to the proper
person in Florida and an answer was back to the
sender in twenty -three minutes.
The following
stations operated in the cleared channel: \V3LA,

WSAVS, \V5DAN, W2FJU,
M. WIGXD. W9M M. \V813WH,
W4\I1 W3y1K, CO8YB, W4COD, W8IXP
and \'4ANU.
"Time and again one could hear a station in
1V3AI5l

WIA

the cleared area and one of the high powered
"(watch -dogs as W4BYY called them) stations
.

(Turn to page 376)

RADIO NEWS FOR DECEMBER,

1935

333

LOW -COST "HAM" SET

EMPLOYS

"DUAL"
REGENERATION
(Jones- Silver. "Super-Gainer'

THE FRONT VIEW

dit

excellent degree of band spread is provided. Rough
tuning is accomplished by the two controls above and
ganged band spread by means of the large central dial.

By McMurdo Silver
REGENERATION is the oldest
known method of getting something for, relatively, nothing.
Regeneration applied to a single tube
will yield sensitivity limited only by its
degree and stability, which is simply
another way of saying that in the matter
of sensitivity alone, a regenerative detector will give just about all that can
be had from multi -tube "repeater"
amplifiers.
The price paid is the criticalness of
regeneration control, this being one of
the reasons for its abandonment in favor of complicated multi -stage but noncritical receivers in the broadcast field.
The second reason is selectivity. On
weak signals the selectivity of a critically regenerative detector is quite good,
but not with strong interfering signals.
However, if selectivity, or the major
portion thereof, can be had through the
use of several good tuned circuits, then
regeneration will simply and economically contribute additional selectivity and
gain.
A 3 -Tube Superhet
Going from the general to the specific,
the. "Super- Gainer" described herewith,
using only three tubes (plus a rectifier).
provides a high order of sensitivity and
image selectivity and through non-critical i.f. regeneration, practically "single signal" selectivity on c.w. reception.
Conceived by Frank Jones, the
"Super- Gainer," for no more than the
cost of a "three -tube. one ri., regenerative detector and one a.f. amplifier,"
can be quickly and easily built to give

erative detector both tune quite sharp,
relatively, no attempt is made to gang
the two circuits except over the narrow
amateur and s.w. broadcast frequency
bands. This can be done quite nicely
for any actually used frequency bands
by simply first tuning or setting the separate first detector and oscillator tank
tuning condensers controled by the upper left and right knobs.
The 6C6 first detector feeds a dual
tuned Aladdin "Polyiron" iron -cored i.f.
transformer tuned to anywhere between
450 and 500 kc. The two high -Q circuits of this i.f. transformer contribute
about as much selectivity and almost as
much gain as would two ordinary air core i.f. transformers. But here again
regeneration is used to further increase
gain and selectivity up to practical
single -signal proportions.

practically the full selectivity and all
the gain of much more expensive super hets. As such, it is the answer to the
prayer for a fine receiver by thousands
of financially embarrassed c.w. amateurs.
How all this is accomplished is best
explained by the circuit herewith.

R.F. and I.F. Regeneration
Signals are fed from an antenna
through the usual low (twisted hook-up
wire) capacity to the tuned grid circuit
of the 6C6 first detector. This 6C6 is
hooked up as the conventional "electron coupled" regenerative detector, regeneration being controlled by the screen grid voltage potentiometer. Rl. Quite
obviously this circuit so far is a one tube regenerative receiver, capable of
all of the weak- signal sensitivity of such
circuits. But for selectivity, this circuit is called upon only to discriminate
between a desired signal and its "image"
900 to 1000 kc. away. This it can easily
do by virtue of a good high-Q circuit,
plus regeneration.
To the suppressor grid of this 6C6
first detector is connected the 76 oscillator plate (or grid, preferably). This
is pure electron coupling of a stable,
harmonic -free type but without prolific
harmonic generation.
Because the oscillator and the regen-

Providing Regeneration
The first section of a 79 dual triode
is used as the regenerative second detector. Regeneration is provided by connecting the r.f. choke, L5, between
cathode and B
or its plate return.
This makes a conventional oscillator
circuit, oscillation and regeneration
being controlled by rheostat R2 shunt-

ing L5.

The second triode section of the 79
tube is the audio amplifier, resistance
coupled to the first 79 triode section
(second detector), and terminates in the
tip jacks for headphones. A magnetic
loudspeaker may be used satisfactorily
on fairly strong signals.
A 12Z3 rectifier (Turn to page 371)

A UNIQUE LAYOUT
The designers have adapted an unusual assembly plan which results in
short leads and high efficiency. The
circuit is shown o the right.

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RADIO NEWS FOR DECEMBER,

1935

Checking - Up

A review of some of

the results obtained
CONDUCTING 5 -METER DX TESTS AT PELHAM
Here is the 5-meter experimental transmitting and receiving station set up at the
Westchester Listening Post to investigate possibilities of 5 -meter DX. This post is
located on the lop of a high hill and is considered to be a very favorable location.
Participating in the tests, left to right are Ed. Berliant W2HHE, your Editor, Ben
Russ W2QZ, and Nat Bernstein 11'2GKB.

when RADIO NEWS enlisted the aid of a number of local 5 -meter
amáteurs last summer
to test the distance covering ability of 5 -meter
communications

By L. M. Cockaday

THE TRANSMITTER, FRONT AND REAR VIEWS
The illustrations, above, show the front and rear views of the 5 -meter transmitter
used in the tests. The job is completely a.c. operated and all control is accomplished
from the front of the panel. The unit is completely encased in the rear as well as top,
bottom and front. The shielding cases have been removed to show the layout.
WHAT THE RECEIVER LOOKS LIKE
The two lower illustrations show the inside and front views of the superheterodyne
receiver employed in this series of tests. The receiver is completely single -control and
fully shielded as indicated below. Noti e the novel method of coupling the coils to
the antenna circuit.

DURING the last six months we
have heard of many DX records
being broken in the United
States and in England for distance transmissions on 5 -meter wavelengths. First
it was 30 to 40 miles. Then distances
from 100 to 150 miles were mentioned
and later distances as great as 500 to
700 miles were rumored as the maximum figures for reception of these tiny
wavelength signals. In order to check
up on these rumors, our staff outlined
a series of experimental transmissions
and made arrangements to have them
listened for by 5 -meter observers at distant points. The results may be summarized as follows: Distances up to 25
to 35 and often 50 miles may be easily
covered with a suitable antenna placed
at the best available heights above
ground at the various locations. Distances well over 100 miles can be
covered fairly regularly from the tops
of high buildings, hills, etc.; and
once in a while a distance of 300 to
500 miles is covered and reported by
listeners.

Proved Reliability
At any rate, RADIO NEWS is convinced that ultra -high frequencies have
emerged from the preliminary laboratory stages to a point where, with the
suitable apparatus now obtainable, reliable voice transmission can be obtained
and with very low powers (of the order
of 10 watts output) the various distances mentioned above can be covered
fairly regularly, depending upon the location.
The importance of 5 -meter communication is also further demonstrated in
localities where heavy static is prevalent. Here the amateur phone wavelengths above 75 meters are severely
interfered with, whereas the 5 -meter
wavelengths cover the local area, up to

www.americanradiohistory.com

RADIO NEWS FOR DECEMBER,

335

1935

on the Possibility

meter

q ti

ai RADFORD PA.
..

P1w_

QSA

QE6

DX
i
30 miles. with no sign of static. On the
20 -meter bands transmissions from 25
to 100 miles are often impossible due to

the "skip- distance" effect. For semi local transmissions, therefore, the 5meter band seems to be ideal.
Five -meter waves seem to travel fairly
close to the ground in a more or less
straight line, and the latest researches
indicate that these 5- to 8 -meter waves
occasionally skip so that they also can
be heard over distances of hundreds of
miles.

Possible Applications
In many cases where the terrain is
wild and inaccessible, as in the jungles
of South America, where there are no
existing telephone or telegraph services,
where expeditions send out hunting or
exploration parties or where a mine is
located some distance from a central
camp, for working between forest
camps, for amateur portable work, the
5 -meter transmitter and receiver should
be ideal.
Many radio laboratories throughout
the world are now devoting high pressure work to these frequencies. Mr. B.
H. Russ, one of the leading experimenters working with these waves and also
chief engineer of the Eastern Radio
Specialty Company, has completed a
series of designs of such equipment.
He has made many tests in the field and
working together with RADIO NEWS,
with the transmitting and receiving
equipment pictured on this page, has
conducted many tests in the field on 5
meters. Some of these test contacts
have been made from the Peak Laboratory, Columbus Circle, New York.
using the call W2QZ portable. Some of
the 5 -meter amateurs worked consistently from this point during the tests
were W2BZM of North Bergen, N. J.,
who reported signals QSA -5, R9 plus;
W2HVZ, Brbnx, N. Y.. QSA -5, R8 plus;
W2IJV, Pelham Bay. N. Y., QSA -5, R8;
W2HUS, Paterson, N. J.. QSA-5, R7
plus; W2HEJ, Jersey City, N. J., QSA -5.
R8. Of course, many other stations
were worked and reports up to 30 miles,
on quality of voice using this transmitter. were excellent. comparing favorably
with the finest ,20-meter transmissions.
Later, a. series of tests was conducted
with the apparatus located in a tower
of the Half Moon Hotel, located on a
flat terrain, on the boardwalk at Coney

:__..

POBiRfl.lD(iA" o

Island. N. Y., with

the call letters

W2GKB portable.
The object of this
special test was to
work from a height
over a flat -surface
country for greater
distance. A great
many 5 -meter amateur stations were
worked, including
two contacts with
W3DRA in Strafford, Pa., airline distance estimated as
between 110 and
115 miles.
Later tests were

made with this type

apparatus

MI_3

'7.0.2°

v. o
M 20

20.SP^.

:.P:... ú
tCëYw2 I

TT
l

[

"THE PROOF OF THE PUDDING"
Some of the long -distance verifications received
as a result of these 5 -meter tests. Beim: The schematic
diagram of the transmitter circuit.

At top:

in the
Bronx from station
IV2APV and a number of long- distance
contacts were maintained and many reports from Listening Post Observers
were received. the maximum distance
covered being from Kalamazoo, Mich.,

E%cew

ACORN
Pentode

By J. van Lienden
TUBE engineers have found room to
put two more elements into the acorn
tube, giving us the "acorn" pentode,
to be designated as type 954. This ryew
tube looks very much like the 955 except
that there are two more terminals, one on
top and one at the bottom. These are the
plate and the grid. The pentode is intended for use as an ri. amplifier at ultra short waves, as a detector, or as an a.f.
amplifier. Due to the construction of the
tube, a gain of 3 or more is possible at
300 to 400 megacycles; at lower frequencies higher gains can be obtained. This
-is a considerable improvement over the
larger size tubes, which will not give any
gain at all at such frequencies!
Characteristics of the tube are shown in
Table I, while a plate family of curves

www.americanradiohistory.com

distance well over 500 miles. Verification cards for these distances have
been received and a couple of them
are shown on this page. An interesting
demonstration in (Turn to page 369)
a

G3
SUPPRESSOR

LEAD TO

LPEATDETO

Hat

GRID

--t
FI G.

HEATER

CATHODE

appears in Figure 2. Figure 1 shows the
connections to the socket. The five terminals, which are situated in one plane,
can be mounted on the usual socket- available for the 955. Note, however, that the
prongs which connect to plate and grid
on the 955, go to the screen and the suppressor on the 954. Special clips should
be used for connection to the upper and
lower prongs. The manufacturer warns
not to solder to the prongs of the tube
since the heat will damage the seal.
Extraordinary care has to be taken in
shielding and by- passing; in fait, the technique of set construction will have
be
(Continued on page 341)

33s

RADIO NEWS FOR DECEMBER,

1935

Theory and Practice for Correct

IMPEDANCE MATCH
By C. A. Johnson
Part Four
IN

Part III we learned what happens
when impedances are mismatched in
an audio frequency transmission line.
Distortion is introduced by reflection
losses and reflection phase shifts, both
of which usually vary with frequency.

SINCE the component units of an
audio- frequency system seldom
have the same terminal impedance, we must have available a suitable
means of matching different impedances.
Transformers are frequently employed
for this purpose. We all know that a
properly designed impedance -matching
transformer performs this duty satisfactorily. Insufficient knowledge as to
just how and why a transformer functions sometimes prevents us from making the most of their possibilities. In
this installment, therefore, we shall attempt to explain the elementary theory
of a transformer as an impedanceadjusting device. The theory is not difficult, but it is very important to
memorize it to an extent where you can
use the information without referring
to a textbook.

An Exact Definition
When you are called upon to define
a transformer, you usually visualize a
device having two separate windings on
a common core. Then you proceed to
explain that energy is transferred from
one winding to the other by the magnetic flux that flows through the core,
and is therefore common to both coils.
Such a description of a transformer is

satisfactory for qualitative purposes.
For analytical work. we need a more
exact definition.
We may define a transformer as any
network with two or more windings between which there exists a "mutual impedance." This means that the circuits
associated with each winding will influence each other. These effects are
measurable, of course. and can therefore be evaluated quantitatively. The
mutual impedance between a winding
A and a winding B is defined as the
vector ratio between the open -circuit
voltage on A, and the current flowing
in B. Since the impedance is "mutual."
it works both ways. That is, it may
also be defined as the vector ratio of
the open- circuit voltage on B and to the
current flowing in A. These definitions
probably sound very simple and trite,
but they give the first and most important clue to the action of a trans former as an impedance- matching device; namely, what happens in one
winding determines the characteristics
of the other.

For sake of simplicity, we will first
analyze the action of an ideal transformer. By this we mean a transformer
consisting of two purely inductive windings, and having no magnetic losses.
Later we will show to what extent this
ideal is approached in practice. Figure
1
is a diagram illustrating a simple
transformer. We will define the symbols used as follows:

Terminals
dary.

3 &

2-Terminals

and

E= IpZp +I,Z

(2)

I,Z, +IpZp +IpZ,,, =O

(3)

Now from these equations we see that

Symbols Used
Terminals
mary.

helps to clarify the action of Z,,,. In
the light of this information, we may
write the following equations for
Figure 1.
By Kirchoff's First Law and our definition of Zm,

of pri-

4-Terminals of secon-

E-Voltage

applied to primary.

4-Current

flowing in primary.

I,-Current

flowing in secondary.

Z,,, is the connecting link between the

current in the primary and the voltage
in the secondary, or vice versa. You
must always remember that a transformer, as such, always works the same
way in either direction. The terms "primary" and "secondary" are merely a
convenient way of designating the source
and load in a system.
From equations (2) and (3) it may
also be shown that

Zp- Inherent

impedance of primary
due to its inductive reactance.

Z,-

Inherent impedance of secondary
winding due to its inductive reactance.
Z,,, -The mutual impedance existing
between the two windings.

Z,_.-Impedance

looking into the priNote that this is not the same

mary.
as Zp!

Z,_,- Impedance
ondary.
as Z,!

looking into the secNote that this is not the same

All of the above values of Z are
usually complex quantities in practice
(see Part II), but in this analysis we
do not have to separate them into real
and imaginary parts.

An Ideal Transformer
Now it can be shown that in the case
of an ideal transformer both Z,, and Zx
are infinitely large pure inductances.
Furthermore, in the ideal case, we always have the following relation between Zp, Z, and Z,,,
Z,,,

=1/ZpZ,

(1)

It appears, therefore, that Z,_, is determined by a combination of the effects
of Zp and Z,,,. Similarly. Z,_, is a function of both Z, and Z,,,. This fact

www.americanradiohistory.com

(4)

The detailed calculations involve differential calculus and are not of extreme
importance here. The important thing
to notice is very simple and should
never be forgotten. Look at equation
(4) once more. Note that the value of
Z,_, is entirely dependent upon ZL!
The values of Zp and Z, merely determine the ratio of the transformer. This
is strictly true. of course, only in the
case of the ideal transformer. However, it is true within limits for any
practical case.

Impedance Ratio

ZL- Impedance

of load that may be
attached to the secondary.

Hence, we may conclude that it is
never correct to assume that the "ohms
primary" and "ohms secondary" of a
given transformer are fixed constants
like the resistance of a piece of wire.
The impedance ratings on transformer
windings are always interdependent. A
transformer designed to match a 200 ohm line to a 500 -ohm line is designed

ratio of .4. It usually
Z,
will work equally well for matching a
250 -ohm line to a 625 -ohm line, and
often for still higher or lower values,
provided the ratio is the same.
In our next installment, we will discuss the factors that determine the impedance range over which ordinary
transformers may be used. This depends upon the width of the frequency
band to be transmitted, and on the
allowable distortion.
to have

RADIO NEWS FOR DECEMBER,

1935

T(eceiver for the

TALKING
LIGHT-BEAM

TELEPHONE
By C. A. Johnson and V. Sharp
IN

this article is described the receiving circuit used with our light -beam
transmitter at New York University.
Many other types of circuits may be
used, but we offer this working design
as a starting point for our experi-

menters.
The essential units of a successful

apparatus are:
1. Some type of light- sensitive device
(such as a photo-cell) having a uniform
frequency response over the audio range.
2. A low noise -level pre -amplifier
having enough gain to bring the photocell output up to about -50 decibels for
the average signal level.
3. A power amplifier having a gain of
about 80 decibels, and sufficient power
output for the loudspeaker system required.
We have tried all available types of
light- sensitive devices. Some types appear to have an advantage from the
standpoint of output level, but this is
usually offset by non -uniform frequency
response, and difficulty of coupling to
the pre -amplifier.
The photo cell we are using at present is a Cetron type CE -2, which was
designed for talking motion -picture
work. Any similar type, such as the
G.E. PJ23, will work equally well. The
standard type of photo -cell coupling circuit is used as shown in Figure 1.

FIG.2

The values of resistor and coupling condenser shown were found to give the
best combination of gain and frequency
response in our system. We also found
that by adding the by -pass condenser,
C -2, and the resistor, R -6, the circuit
was more stable at high gain.

The Pre -amplifier
The circuit of the pre -amplifier is also
shown in Figure 1. It is similar in design to that in any sound -head amplifier. Since the power consumption is
low, we designed it to operate with batteries so as to simplify our problem of
hum elimination. This also enabled us
to use the 864 type of tube, which gave
us the least trouble with i icrophonics.
This circuit will prove to be very satisfactory for experimental work, because
it is flexible, inexpensive; and can be
built so that it is completely free from
extraneous noises.
We have tried two different methods
of arranging this equipment on a chassis.
Each has some advantages, depending

CONSTRUCTION DETAILS
Figure 1 gives the circuit for the complete pre -amplifier. Figure 2 shows
the circuit for an external photoelectric pick -up for use if it is desired,to
move it a distance away from the preamplifier. The photograph shows an
internal view of the pre -amplifier with
a compartment for batteries and another compartment for the photo-cell

housing to fit into

LENS

ALTERNATIVE
EXTERNAL HEAD
FOR P.E. CELL

THE RECEIVING UNIT

READY FOR ACTION
At the left is the pre -amplifier in its
carrying case. At the right is the
photo -cell on its tripod and the condensing lens.

upon the requirements of the problem,
and upon the parts that you have available. The first method is to mount the
photo -cell in a housing that is separate
from the pre -amplifier. Connection is
then made by means of a welt-shielded
and insulated photo -cell cable. The second method is to build the photo -cell
and two amplifier stages into one common housing. This eliminates the problem of a photo-cell cable, but introduces
the problem of an isolated battery supply; unless the entire outfit is to be
cumbersome. We have obtained better
results with the second method, but will
describe, briefly, the mechanical details
of each.

Construction
If the photo-cell

is to be in a separate
unit, the first problem is to build the
housing. For this purpose, we built a
16 -gauge sheet -iron box, 3%" square
and 5" high. The top was fitted with a
removable cover, held in place with
Parker -Kalon screws. A one -inch round
hole was cut in the back side of the box
(about 2 inches above the bottom), for
the photo-cell cable. A % -inch round
hole was cut on the front side of the
box for the photo -cell window. The
height of this hole (Turn to page 381)

864

"
5MEG

LENS

864

M FD.

MFD.

141

Ri
MEG.
C2
.5

MFD.
RS
M EG.

CS
MFD.

FIG.1

C-

3 V.

C4.5V.

www.americanradiohistory.com

A-

B-

C+

A+
3V.

180V.

B+
P.E.C.
45 V.

338

RADIO NEWS FOR DECEMBER,

1935

ELLING
The Opening Gun in the
Battle for Better Servicing

DOOR -TO -DOOR
AN important sales method often
featured. Our readers are invited to guess what is wrong with this
picture; then read the article and find
out if you are correct.
may be the best radio serviceman in town, but if you cannot
sell your services to the members
of your community, all your technical
training, equipment and experience are
of little value to you. And if you are
a beginner in service work you must
learn the business side of the profession plus the technical side!
It is a well known fact that among
many independent servicemen there
exists, far too often, a certain lack of
showmanship and business ability which
seems to be associated naturally with
the technical mind. Invariably. it acts
as a distinct barrier to the building up
of a flourishing and successful business.
and the sooner you realize it the better
off you are going to be!
YOL'

Building Your Business

PLANNING THIS IMPORTANT SERVICE SERIES
T this conference in the RADIO NEWS Editorial sanctum plans were made to
incorporate in this series all of the information necessary to help servicemen,
beginners and old timers, too, for that matter, in understanding the purely business
aspects of servicing. Left to right: Mr. John H. Potts, Associate Technical Editor;
Mr. Alfred A. Ghirardi. well -known service expert; Mr. T. S. Ruggles. specialist
in business building; and your Managing Editor, Mr. S. Gordon Taylor.

to tell you how to go about it. You
yourself will have to decide how big
a "splash" you can make then carry out
your own program. It is our aim to
show you exactly how to "make sales of
your service" in ways that will promote customer good -will and make many
new friends; how to "promote" your
business (no matter how small) through
the many channels open to you by
tested and proved methods; how to

make "extra" profits; how to put "good
business methods" to use; how to keep
"service and sales records" so that the
maximum amount of important and
useful information is made available at
a moment's notice. etc. When these
fundamentals are fully understood, your
own common sense and ingenuity
should carry you on toward a fuller
measure of success than you have heretofore enjoyed!

OVER-THE -COUNTER SALES PROFITABLE
THE well - stocked

sales counter of a successful and reliable service organization
Pelham. N. Y. Notice the side -lines carried. Mr. Walter R. Kolb,
co- partner in the business. says. "This is one of the most profitable adjuncts to
our business." He is shown serving a customer.

There is really no excuse for this state.
of affairs. It is likely that most servicemen are so engrossed with the ever -increasing technical complexities of their
work that they just don't think of an
advertising and promotion side to their
business and so have never set out to
find out anything about it. Many of
them think that it costs so much money
to advertise that only large organizations can afford it. They do not realize
that there are numerous excellent business- building methods open to even the
smallest shop. If you are a serviceman you can easily be a good business
man and a good salesman if only you
will learn the fundamentals of business
promotion and apply yourself to its
problems with the same degree of enthusiasm and seriousness that you show
in the technical phases of your work. It
is the purpose of this series of articles

www.americanradiohistory.com

RADIO NEWS FOR DECEMBER,

1935

Most of the larger service and sales organizations are fully aware of the great value
of business methods, advertising and promotion.
But some servicemen, working
alone, forget these aids, which mean all the
difference between making a "fair profit"
and "just a bare living"
SELLING OVER THE TELEPHONE

By A. A. Ghirardi
and T. S. Ruggles
First of all, it must be understood
that there is a definite technique involved in getting new business and holding your present business against competition, just as there must be a definite
technique in servicing radio equipment
or doing almost any other worthwhile
thing. Also, that there are many different methods to be employed in getting new business-some are open to
all, others work well in some types of
communities and not in others, still
others are effective only at certain times
of the year and others require such a
large outlay of money that only large
organizations are prepared to finance
them.

Keeping At It
The next important point is that no
matter what methods you employ, they
must be plugged systematically and doggedly! This is one of the most important "secrets" of the entire story-if
you are not prepared to carry out any
business promotion plan persistently
and systematically, you'd better not
start it at all-you'll lose less money
by not starting. Your business may
absorb your thought 24 hours a day,
but remember that it is not sufficient
to tell a man about your services only
once in order to sell him. His life is
full of other interests which occupy
his attention in rapid succession, and
he will soon forget about you -unless
you hammer away at him at sufficiently frequent intervals (with your message) until he automatically thinks of
your shop when any question about his
radio comes up. Then, and not until
then, have you really "sold" your service to him.

Selecting Your Methods
There are many different methods
which are available to you for getting
business. For example there is "personal" selling (and that includes both
counter selling and door -to -door selling
or "canvassing "), telephone selling,
direct mail advertising (postcards, blotters, log books, sales letters, etc.),

DON'T forget that many profitable sales of radio service, as well as sales of electrical repairs and wholesale appliances, can be made over the telephone. That is
one of the main efforts of Mr. Jerry Liucci, of the service
firm of Kolb & Crawford, in Pelham, New York.

is-

newspaper advertising, radio advertising and displays. These and other types
of selling will be described at appropriate places in this series. Best results are usually obtained when the
serviceman uses a combination of these
sales methods such that one follows up
the efforts of the other -for example,
direct mail, followed by telephone or
personal selling, etc.
You must understand thoroughly that
personal salesmanship is basic in a
successful servicing business! Your business is a "personal- service" business.
Your customers are not buying merchandise so much as they are buying
your own personal services. The thing

you've really got to sell
yourselfas well as your shop. Therefore, isn't
it obvious that the most logical way
to sell yourself is through personal
contact if the set -up of your business
and community makes this practical?
Every time a prospect (or a regular
customer) comes into your shop, you
should be two men in one-an expert
technician and an expert salesman. One
without the other is a serious handicap
in these days of exceedingly keen competition. But selling at the counter is
really the easiest of all kinds of selling.
The customer was already sufficiently
interested in what you have to offer to
take the time to (Turn to page 383)

More Information on

PIN NUMBER ARRANGEMENT

METAL
TUBES
John M. Borst
the

information
SUPPLEMENTING
given in the June issue, below are
given the characteristics of four additional metal tubes released by R.C.A. These
are the 5Z4, a full -wave rectifier, the 6F5,
a high -mu triode, the 6F6, a power pentode, and the 6L7, a pentagrid mixer tube
of a new design.
All these tubes, regardless of the number of prongs, will fit the same eight -contact socket. An illustration of the bottom
view of the base is shown in Figure 1.
The concentric circles of pins show which
pins are omitted in the 7 -, and 6 -prong
tubes, and the two different 5 -prong arrangements. The key of the central pin
points to the space between pins number
1 and number 8. The diameter of the pin circle is .687 inch; the length of the pins
is .375 inch and the length of the central
pin in .56 inch. The maximum diameter
of the base, which is also the maximum
diameter of the tube, is 1i'e inch. A bot-

SMALL OCTAL 8-PIN BASE
SMALL OCTAL 7-PIN BASE
SMALL OCTAL 6-PIN BASE

°°°

©© © O KEY
O

Oe
0

BOTTOM VIEW

tom view of type 6A8 is shown in
Figure 2.
Here is a brief review of the previously
described metal tubes, giving their purpose,
the glass equivalents, and the prong connections.
With very few exceptions, pin number
1 is connected to the shell, pins number 2
and 7 are the heaters, pin number 8 is
always a cathode and pin number 3 is the
plate. Unless otherwise indicated, this is
true of the following tubes.

6A8-A pentagrid converter, equivalent

to the 6A7. In addition to the above regular pin connections, pin number 4 connects to the screen, number 5 to the os(Turn to page 341)

310

RADIO NEWS FOR DECEMBER,

1935

EUROPEAN STATION LIST
Minna

ALBANIA
Cali

Location

ka.

Under construction

Graz
Linz

Klagenfurt
Dornbirn (Vorarlberg)
Salzburg

BELGIUM

ON4RW

Brussels
Brussels
Schaerbeek
Brussels

519
592
886
1294
1294
1294
1348

2.0
100.0

620
932

15.0
15.0
0.1
0.1
0.1
0.1
0.1
0.1
0.1

122
122

Antwerp
Courtrai
Chatelineau

465
465
491
491

Binche
Liege Experimental!

500
500
500
500
500
300
500

Andrimont
Verviers

Liege
Liege
Seraing
Vellereille- le- Brayeux
(Wallonia)

1402

CZECHOSLOVAKIA

Slovakia
Prague (Liblice)
Brno
Bratislava
Morayska Ostrava

392
638
922
1004

Kosice

Prague (Strasnicel

Danzig

OXP

OXQ

DANZIG

0.1
0.1
0.1
0.1

Kalundborg
Copenhagen

ESTONIA

0.015

30.0
120.0

32.0
2.6
5.0

731

1348

431
10 kw.)
527
Viipuri
749
Pori
749
Sortavala
895
Helsingfora
Vasa (underconstruction)1420
1420
Tampere

FRANCE

Radio Paris
Grenoble
Lyons -P. T. T.
Paris Regional
Marseilles Provence
Toulouse -P. T. T.
Strasbourg -P. T. T.
Radio Agen
Radio Toulouse
Limoges -P. T. T.
Paris (Poste Parisien)
Rennes -P. T. T.
Bordeaux -Lafayette
Fecamp (Radio
Normandie)
Nice
Lille -P. T. T.
Radio Nice (Juan -lesPins)
Montpellier
Paris "RadioVitus"
Bordeaux (Sud Ouest)
Paris (Radio-Ile de
France)
Radio Lyons
Radio Beziers
Paris (Radio LL)
Paris (Eiffel Tower)
Radio Nimes

1429
1500

2RN

71PA
11E1

IIRO
IIMI
LIGE
I I BA

I INA
I

ITO

0.5

60.0
10.0

VLZ

20.0
0.5

1.5

60.0
0.5
60.0
40.0
30.0

1113
1185
1213

10.0
60.0

1249
1339
1348
1348

2.0
5.0
2.0
3.0

1348
1393

2.0
5.0
0.3
0.8
20.0

191

Riga
Madona
Kuldiga
Liepaja

60.0
100.0
60.0

20.0

EEAJ4J16

1240
1348

1.0
1.0

LKO
I.KJ
LKH
L KT
1.KF
LKB

I.KD
LKP

LKA
L KM

LKG
LKS
LKK
LKR
LKX

NORWAY

Oslo

Finnmark
Hamar
Trondelag
Frederikstad
Bergen
Bodo

Porsgrunn
Aalesund
Tromso
Narvik
Stavanger
Christiansand
Rjnkan
Notodden

POLAND

Warsaw
\Vilno
Katowice
Lwow

Poznan
Torun
Krakow
Lodz

CTIAA
CTIGL
CTIBO

CTIDH
CTI DR
CTIEB
CTI IV
CTIMO

PORTUGAL

Lisbon
Parade
Lisbon
Lisbon
Lisbon
Lisbon
Lisbon
Lisbon

EAJ15
EAJ 19
EAJ7

EAJ4
EAJ6
EAJ

E4J17

EAJ20
EAJ2I

E4J23

1059
1104
1140
1222
1258
1357
1366

1.0

3.0
20.0
50.0
50.0
10.0
20.0
1.5
t

7.0
10.0
1.0
4.0
0.2

EAJ27

E4J28

EAJ3I
EAJ33
EAJ34
EAJ39
EAJ4l
EAJ42
EAJ43
EAJ44
EAJ46
EAJ47
EAJ48
EAJ51

583
1104
1258
1734

15.0
50.0
10.0
0.1

5;
E.4J57
EAJ58
EAJ60

ÉrA.j65

NETHERLANDS
-

ÉAJ3

60.0

Kannas

Kootwijk
After 15.40 GMT
Hilversum
After sums

E.4J2
EAJ5

531

536
565
610
713
814

155

7.0

EAJ 11

230

150.0

EAJ 18
EAJ22
EAJ25
EAJ26

E\114

EU29
EaJ3o

E4J32

160

995

7.0
150.0
7.0
25.0

EAJ35
EAJ36
EAJ3.

RAS

E4J40

260

349
510
629

776
850

850
850
850

1204
1222
1276
1276
1348
1.357

224
536
758
795
8681

986

60.0
I0.0
0.7

20.0
0.7
1.0
0.5
0.7
0.35
0.1

0.3
0.5
0.5
0.15
0.15
120.0
16.0
12.0
16.0
16.0

24.0

1022
1339

2.0
2.0

629

20.0
5.0

1031

1348
1411
1411
1411
1411
1411

0.05
0.05
0.04

0.04
0.04
0.04

1411
1411
1411

Oporto
Oporto
Oporto
Oporto
Oporto
Oporto
Oporto

1429
1429
1429
1429
1429
1429
1492
1492
1492

Lisbon

Oporto
Oporto

EAJ45
EAJ49
EAJ50
EAJ52
EAJ55
EAJ56
EAJ62
EAJ63
EAJ64
EAJ68
SBG
SBE
SBF
SBD
SCN
SBA
SBB
SCC
SCV

SCP

SCU
SCL
SBK
SBC

SBJ
SCF
SCG
SCR
SCS
SCE

SC\V

SPAIN

Madrid

Seville
Barcelona
Valencia
Barcelona
Oviedo

731
731

795
850
022
022
Madrid
095
258
San Sebastian
Santiago de Compostela 492
Pamplona
492
Malaga
492
492
Zaragoza
492
Alcoy.
Palma de Mallorca
492
Granada
492
492
Hurcia
492
Sabadell
492
hlelilla
Gandia
492
Cordoba
492
492
Burgos
492
Bilbao
492
Alicante
492
Tarragona
492
Gijon
492
Badalona
492
La Coruna
492
Landa
S. C. Tenerife
492

Albaceta
Ceuta
Valladolid

492
492
492
492

Manresa
Badajoz
Alcira
Orense
Jerez Fra (Cadiz)
Almeria
Jaen
Ciudad Real
Reus
Castellon
Logron
Huesca
Tarassa
Antequera
Alcala de Henares
(Madrid)
Onteniente (Valencia)
Santander
Villanueva Geltru
(Barcelona)

492
492
492
492
492
492
492
492
500
500
500
500

Vigo

Jativa

Linares
Gerona
Pontevedra
Denia
Toledo
Las Palmas
Elche
Algeciras
Salamanca
Vitoria
Leon
Segovia
Lugo

hlotala

SWEDEN

Boden

Ostersund
Sundsvall
hlalmberget
Stockholm
Goteborg
Falun
Horby
Orebro
Eskilstuna
Sagte
Varberg
Kiruna
Karlstad
Malmo
Norrkoping
Trollhattan
Hudiksvall
Halsingborg
Uddevalla
U mea

0.04
0.04
0.3
0.25
0.05
0.05
0.04
0.1

0.05
0.04
0.3
0.3

RUMANIA

Brasov, will increase power to 150
kw.
160
Bucharest
823

ÉÌO

LITHUANIA

1.3

0.2

1.5
1.5

Lisbon
Lisbon

Bed,

0.3

986

LATVIA

CSICF

16.0

Palermo
Firenze

Turin I
Trieste
Rome III
Milan II
Turin II

CSIRP
CS1BI
CS1AA

208

ITALY

Rome I
Milan I
Genoa
Bari
Naples

CS1RG

1438
1465

1321

Reykjavik

Bolzano

CT IAN
CSISR
CS1IR

120.0
6.25
1.25
1.25
1.25

ICELAND

Athlone
Cork
Dublin

CTIKM

1.5
1.5
1.5

Malta(under construct ion)1176

0.7
0.5
0.5

7.0
5.0
2.0
35.0

2.0
5.0
2.0
5.0
2.0
0.25

MALTA

1.5

15.0
15.0

574
658

Miskolc
Pecs

1.5

80.0

1491

\tagyarovar

359
546
1122

Luxemburg

10.0
1.0
0.25
10.0

182

1424
1456

Budapest II
Budapest I
Nyiregyhaza

1330
1330
1330
1330
1330
1348

LUXEMBURG

40.0

GERMANY

Koenigswusterhausen
(Deutschlandsender)
Muehlacker
Langenbcrg

6C K

IITR

583
648
695
749
776
859
863
895
895
959
1040
1077

1411

HUNGARY

100.0
120.0
100.0
100.0
100.0
60.0
25.0
0.5

IRISH FREE STATE

LVT

166
220 kw.)
Oulu (to be increased to

Turku
Pietarsaari

HAL?
HAL
HAE
HAE2
HAE3
HAE4

IiBZ

FINLAND

OFE

Koenigsberg

2.0

13.5
11.2

Lahti (to be increased to

OFA

Stettin

1.0

1158
1204

238
1176

Tartu

OFH
OFD

Gleiwitz
Nuernberg
Dresden
Bremen
Flensburg
Hanover
Magdeburg

0.1

1113

1303

DENMARK

Tallinn

Trier
Freiburg
Coblentz

5.0
5.0
2.0

0.l

1195
1195
1195
1195
1193
1195
1231
1267
1285

Kassel

TFU

struction)

OKB
OKR
OKK

904
950
1031

Frankfurt
Kaiserslautern

7.5
16.0

BULGARIA

Sofia (to be increased to
2 kw.)
850
Varna (to be increased to
2 kw.)
1276
Stara Zagora (under con-

OKP

841

Breslau
Heilsberg

Innsbrucck
Vienna

ON4CE

785

Hamburg

1385

AUSTRIA

ON4EB

740

Leipzig
Berlin -Tegel

kw.

Halmstad
Ornskoldsvik

500
500

2.0

12.0

3.0
3.0
7.5
1.5
1.0
1.0
12.0
3.0
0.2
0.2
0.2
0.2
0.1
0.1
0.2
0.2
0.2
0.2
0.2
0.1
0.2

0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

0.11
0.2
0.2

0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.1

0.2

300
500
500

0.2

500
500
500
300
500
500
500
300
500
500
500
500
300
500
500

0.2
0.2
0.2
0.2
0.2
0.04
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2

216
392
413.5
601

704
704
941
1086
1131

1185

1240
1240
1240
1258
1312
1312
1312
1312
1366
1384
1393
1403
1411
1411

0.1
0.2

150.0

0.6
0.6

10.0
0.2

35.0
10.0
2.0
10.0
0.2
0.2

0.4

0.2
0.2
0.23
2.5
0.25

0.25
0.2
0.2

0.05
0.2
0.2
0.2

RADIO NEWS FOR DECEMBER,
Location

Cali

Kalmar

SCI

SCA
SCD
SCT

Boras
Gavle
Uppsala

SC M

he.

kw.

1438
144,
1483
1492
1500

0.2
0.2

ezv

0.2

ACORN

401

1.3

556
677

100.0
100.0

1167

15.0

Pentode

1375
1375

0.5
0.5

ISIS
1530

SWITZERLAND
Geneva
Beromunster
Softens
Monte Ceneri
Basle

Berne

:; I

0.2
0.2
0.2
0.2

Kristiueham
Jonkoping
Karlskrona

SC H
SCJ

1935

(Continued front page 335)
In order to shield stages

entirely different.

TURK
Istanbul
Ankara

188
231

5.0

7.0

UNITED KINGDOM
Droitwich
(Midland National)
Moorside Edge
(North Regional)
\Vesterglen
(Scottish Regional)
\Vashford Cross
(West Regional)
London Regional
Belfast

Droitwich
(Midland Regional)

\\'esterglen
(Scottish National)
Newcastle
London National
Moorside Edge
(North National)

Wasldord Cross
(West National)
Aberdeen

200

130.0

668

.coo

767

50.0

804
877
977

co.o
50.0
1.0

from each other, the tube can be mounted
as shown in Figure 1, thus separating the
plate and the grid by the shield. Ordinary
bv- passing is not satisfactory at these
ultra- short waves. It is recommended to
employ a flat ribbon as a lead to the tube
terminal and to insulate this from the
grounded shield by a strip of mica. This

then functions as the by -pass condenser
right at the tube terminals. When the
tube is used as an a.f. amplifier, the recommended voltages are: plate supply, 250
volts; screen potential, 50 volts; control-

grid bias,

1013

cathode

1050

50.0

1122

1.0

1149

20.0

1149

20.0

1149
1285

20.0

t.o

2.1
at

volts; suppressor connected

socket; plate load,

meg-

ohm. The plate current is then .5 ma.:
the grid leak can be as nigh as 1 megohm.
The voltage amplification is approximately
100 and an undistorted voltage output of

40 -50 volts rms can be obtained.
The 954 offers several unusual opportunities around the laboratory. For in-

U. S. S. R.
RV1
RV14

RVIO
RV76
RV4

RVS
R\'53
RV I
RCZ
I

RV7

RVSO

RV 19
RV66
RV3
RVO3

RV12
RV24
RV5
RV21
RV27

RV49
RV25
R\'47
RV37
RV8.1

RV45

R\'44
R\41

RV74
RV.14

R\'52

RV42
RR36
RV3.5

RVIS
RV.iI
RV56

R\y29
RV23
RV1,
RV46

RVI6
RV9

R\'65

RV64

R\'78

RV_>6

R\'51

R\'39
RV7.1

R\'61
RV30

Moscow

174
187.5

Irkutsk
Minsk- Kulodisbchi

208

Novosibirsk
Kharkov
Baku
Leningrad
Tashkent
Moscow

217.5

232
238
245
256.4

271
283
310

Tiflis
Alma-Ata

Ashkhabad
Krasnoyarsk
Saratov
Verkhueutliusk
Rostov
Smolensk
Sverdlovsk

Erivan
Makhaclt- Kant
Moscow
Voronezh
Stalinahad
Ufa

Stalingrad
Chita
Gorki
Arkhangelsk
Astrakhan
Pyatigorsk
I vanovo
Vladivostok

10.0

3.0
100.0

413.5

10.0

421.3

2.0
10.0

1.0
1.0
1.0
10.0

556

20.0

565
586
598
610

10.0
10.0

625
635

10.0

1.0
0.3
1.0

Penza

640

Petrozavodsk
Grozny
Kazan
Karaganda
Samara
Kiev
Saransk
Ordzhonikidze
Izhevsk

648
676
686

10.0

686

1.0

713
722
734
749

767
776

Stalin

Nalcltik

Moscow
Simferopol

1.0

10.0

1.0
10.0

.4.0
10.0

794

1.0

832

100.0

859

10.0

888

1.0

Dnepropetrovsk
Engelsk
Gomel

91.5

10.0

R\'.55

937
959

1.0

RV 13

Odessa

968
968

10.0

RV67
RV86
RV7O
RV33

R\'57

RV75
R\-2o

Ukhta

Chcrnigoc
Leningrad
Krasnodar

1013
1040

Tiraspol
Vinnitsa
Kharkov

1.0

2.0
5.0
10.0

1050

1.0

1068
1095
1185

4.0
10.0
10.0

527
6E6
1086

5.0
2.5

YUGOSLAVIA
Ljubljana
Belgrade
Zagreb

Afore Information on

METAL
TUBES

10.0

35.0

0.7

0007 MAX. MMFO.

INPUT

MMFD.

7 3 MMFD.

OUTPUT
OVERALL LENGTH__
OVERALL DIAMETER

1
1

4316

3132

3/46

116'

MAXIMUM RATINGS
Ep(d.c.)___

250 V. MAX
Eg3 SUPPRESSOR (d.c)_____I00 V. MAX
Egg
SCREEN
(d.c)
IOO V. MAX.

-- - -

(Continued from page 339)

dilator grid, number
anode -grid.

6 to the oscillator
connected to the top

cap.

6C5-A triode

with
pin

somewhat like the 76 but
higher mu. The grid connects to

a
5.

6D5 -A triode approximately like the
indirectly heated and using a 6.3
volt filament supply. Pin arrangement is
the same as that of the 6C5.
6H6-A twin diode, which has no glass
equivalent. It contains two diodes with in45, but

dependent cathodes. Pin number three connects to P2, number 4 to K2. Pin number 5 connects to PI and number 8 to Kl.
6J7
pentode amplifier with high amplification factor similar to type 77. The
screen connects to pin 4, suppressor to pin
5, control grid to top cap.
6K7
pentode with variable -mu char-

-A

www.americanradiohistory.com

1.2

2.0

,r¡)

MA.

.01 MU(°",¿

MA.

250,000

RATE LOAD

stance, connected as a triode, it can be
used as a vacuum -tube voltmeter. We can
hen do away with the lead to the source
of voltage to be measured, by building the

1.0
1.0

472
472
472
322

6.3 VOLTS
0.15 AMP.

CAPACITY G -P.
(MTH SHIELD9AFFLE)

Ig2

20.0

401

(a.C. OR d.C.)

1.0

10.0

40.0

10.0

2.0

954

VOLTS
Eg1 (C.G)
-5
-3
SUPPRESSOR(G3) Cow/ ECTED TO CATHODE AT SOGMET
AL
1100
OVER 2000
MEG
RP
I
OvER 1.5
1.400
.,(MHOS
Gm
1100

100.0
35.0

390

461.5

Syktyvkar
Cheloksary

10.0
100.0
25.0

10.0

450

Orenburg
Omsk

100.0

20.0

436

Oirtt -Tura

35.0

340
350
355
364
375
380

TABLE

TYPICAL OPERATION AND CHARACTER STICS
CLASS A AMPLIFIER BIASED DET
Ep
90
250
750(Zrou ) VOLTS
100
100
VOLTS
Egz
90

500.0
20.0

333.3
333.3

OHMS

tube itself inside an oversize tes prod
The grid terminal should tick out and phi_
would make it possible to apply the unknown voltage directly to the tube.

FIG. 2

áÌ0s
n6

3d,"
.687"

2!
3ih11

®7

454g

BOTTOM VIEW OF BASE OF TYPE 6A6

Pli;

N2.1
PIN NQ2
PIN 612-3
PIN N24
PIN 542.5

-MI

-SHELL
HEATER
PLATE
Nt.3 &S GRIDS

PIN N2.6
GRID
PIN W7 -HEATER
PIN N2.8-CATHODE
TOP CAP -N2.4 GRID

NQ.1 GRID

acteristics. similar to type 78. Pin connec
lions are the same as for the 6J7.
The following are the four additional
types:
5Z4-A full -wave high -vacuum rectifier
similar to type 80. Pin connections:
shell,
heater, 4 -plate number 2,
plate number 1,
heater and cathode.

Heater voltage
5 0 volts
Heater current
2 0 amperes
A.C. plate voltage per Plate (r.m.s.)
400 max. volts
Peak inverse voltage
1100 max. volts
Output current (tic )
125 inns. ma.
Max. overall length
554 inch
Max. diameter
1 5/16 inch
Rase
small octal 5 -pin

6F5-A

high mu triode, similar to the
(Tarr to page 380)

RADIO NEWS FOR DECEMBER,

1935

PUERTO RICAN WNEL, 1290 KC.,
.5 KW.
At the left it a "s /rot" of San Juan,
Puerto Rico, with WNEL'J mast towering
above its surroundings. Photo submitted
through courtesy of Observer Johnson, of
Chisholm, Minnesota.

RADIO NEWS Broadcast Band Listening Post
Observers

Official

United States

THE DX CORNER
S. GORDON TAYLOR

(For Broadcast Waves)
THE

1935.36 broadcast band

Attention-Urgent!

sea-

under way and
applications are invited from those who
desire appointments as Official Listening
Post Observers for 1936. If you are now
an Observer and wish to renew your
appointment please drop a line to the
editor of this department to that effect.
If you are not now an Observer but wish
to serve in this capacity during 1936,
include a brief summary of your DX
accomplishments and the equipment you
use. Appointments for 1936 will shortly
be made and 1936 official certificates
issued before the first of the year. There
are no fees or charges of any kind and
the only requirement is that observers
submit monthly reports of distant stations heard.
son is now well

is the purpose of the DX Corner to
provide information which will be of
real help to DX readers. In order to accomplish this it would be extremely helpful if readers would write in stating just
which of its features are best liked. To
cooperate towards this end, please drop a
line to the editor, listing the five features
which have been of most interest and help
to you during this or past months. For
your convenience the various features which
have been appearing are listed as follows:
Foreign "Best Bets" List
DX Calendar
U. S. Station Changes
F.C.C. Monitor Schedules
List of Official RADIO NEWS L.P.O.'s.
DX Club Register
Photos of Stations
Photos of Official Observers
Our Readers ReportForeign Station Addresses
Equipment for the DX'er
Just list the five which you like best,
placing these five in the order of their
importance to you.

a number of terms now being
commonly used in DX circles which the editors believe were originated by RADIO NEWS.
Among these terms are "listening post" as applied-to radio reception, "listening post observer,"
"official listening post," "official listening post
observer." etc. These ternis are copyrighted by
RADIO NEWS and have been in use in this publication regularly since 1932.
During the past year or more some of these
have been quite commonly adopted by the various
DX clubs. More recently, however, newspapers
and other magazines have been following the lead
and are also making free use of these terms.
RADIO News has no objection to their use by DX
or short -wave clubs and hereby extends permission to any and all clubs to use them freely.
However, it is suggested that commercial publications desiring to make use of these terms make
written application to the editors of RADIO NEWS

Following are DX programs to be dedicated
to RADIO News during the month of November.
More complete details on these stations will be
found in the "DX Calendar" elsewhere on these

pages:
Nov. 7, KCMC, 5 -5:30 a.m. (Halsey)
13, WHEF, 1 -2 a.m. (Wood)
13, \VPEN- WRAX,4 -4:30 a.m. ( Cleavre)
17, CMBX, 2 -4 a.m.
20. KGEZ 5.5:30 a.m.
Dec. 4, WDASt, 3 -3:20 a.m. (Cleaver)
It is respectfully and urgently suggested that
every Radio News reader who tunes in these
programs drop a line to the stations reporting on
the reception. Obviously stations receiving a
large number of reports are more favorably inclined towards dedicating future broadcasts to
Radio News and it is therefore hoped that each
one of the stations listed above will be snowed
in with reports from readers of this department
-and, of course, from Official Listening Posts.

DX CALENDAR
Below are given lists of special and periodic
DX broadcasts arranged in the order of dates and
hours for the convenience of DX'ers. These special DX broadcasts constitute a happy hunting
ground for the DX listener and most of them are
put on the air at considerable expense to the station owners. Their only compensation comes in
the form of reports from listeners and it is therefore hoped that RADIO NEWS readers will do
their share by reporting every station tuned in.
Practically all of these stations will verify reception upon request but in fairness it is suggested, where verifications are requested, that return postage be enclosed with reports.
All hours shown are a.m. unless otherwise indicated. All time is Eastern Standard. The
initials at the end of an item are those of the
club to which the individual broadcast is dedicated.

SPECIALS
November
2
3

1260 kc., KVOA, Tucson. ?.riz.. .5 kw.
890 kc., WILL. Urbana. Ill., .25 kw.

-2

1310 kc., CJLS, Yarmouth, N. S.,

3-3:30

1113 he.,

3 -5:10

1400 kc.,

10 kw.

FECAMP, Fecamp, France,
IDA
WIRE. Indianapolis.

5:10.5:30 1420 kc., KCMC, Texarkana, Ark.,
.1 kw.
RADIO NEWS
2 -3
1270 he., CMKC, Santiago, Cuba.
.15 kw.
NRC
2:30.4:30 1320 kc., KID, Idaho Fall, Idaho,
.25 kw.

NNRC

3 -4
1' kc., KFRO, Longview,
NNRC
4:30.5:30 1200 kc., CKXX, \\Ingham, Ontario, .05 kw.
CDXR -NRC
I -2
1360 kc., WGES, Chicago. III..
.5 kw.
NNRC
1 -2
1500 kc., WHEF, Kosciusko, Miss.
.1 kw.
RADIO NEWS
Beg. 2:01 1210 kc., KIUL, Garden City, Kansas,

kw
1320 kc., CMOX. Havana, Cuba.
.25 kw.
920 kc. WPEN -WR\X. Philadelphia,
Pa., .25 kw.
RADIO NEWS
1010 kc., CHML, Hamilton, Ontario, .05 kw.
CDXR
920 kc., K\'OD, Denver, Colo.
.5 kw.
CDXR
583 k-c.. Riga. 15 kw.. 1105 kc.,
.1

2 -5

44:30
16
17

4-5
1

-2

son

Mississippi: Mrs. L. R. Ledbetter
Missouri: Dudley Atkins, III.; C. H.
Long. M. F. Meade
Montana: R. W. Schofield
New Jersey: Henry A. Dare, Jack B.
Schneider, Alan B. Walker
New York: Jacob Altner Murray Buitekant, Stephen Flynn, Ray Geller, Edward F. Goss, Robert Hough. Robert
Humphrey, John C. Kalmbach, Jr..
Harry E. Kentzel, Maynard J. Louis.
Harold Mendier, Robert ('. Schmarder, R. H. Tomlinson, William Wheat.
ley

North Carolina: Marvin D. Dixon
North Dakota: O. Ingmar Oleson
Ohio: Irwin Reitman, Stan Elcheshen,
Donald \t'. Shields, Richard J. Southward
Oregon: David Hunter. Walter Weber
Pennsylvania: Robert W. Bottum, Robert Hoffman Cleaver, Edward Kocsan,
J. Warren Routzahn, Francis Schmidt,
Joseph Stokes
Rhode Island: Spencer E. Lawton
South Dakota: Mrs. A. C. Johnson
Tennessee: W. S. Jackson
Texas: E. L. Kimmons
Vermont: Harry T. Tyndall
Virginia: A. J. Parfitt, C. C. Wilson
Washington: john Marshall Junior High
School Radio Club
West Virginia: Clifford Drain
Wyoming: J. H. \Voodhead

CDXR

kw.
7:30-8:30 950 kc., KMBC, Kansas CitCDXR
I

THERE are

for permission.

Beg. 2
1 -1:15

Alabama: Ray Wood
Arkansas: James F. Halsey
California: Frank D. Andrews, Roy
Covert, Bill Ellis, Randolph Hunt.
Walter B. Mc\Ienamy, Radio Fellowship. George C. Sholin, Warren E.
Winkler
Connecticut: Fred Burleigh, James A.
Dunigan, Stanley Grabowski, Philip R.
Nichols, R. L. Pelkey
Georgia: W. T. Roberts
Illinois: Herbert H. Diedrich, Ray E.
Everly, H. E. Rebensdorf, D. Floyd
Smith
Indiana: E. R. Roberts
Iowa: Lee F. Blodgett, Ernest Byers
Kansas: Vernon Rimer
Maine: Danford Adams, Steadman O.
Fountain, Floyd L. Hammond, Roger
Williams
Maryland: William L. Bauer, Louis J.
McVey, William Rank, Henry \ \'il.
kinson, Jr., Frank Zelinka
Massachusetts: William W. Beal, Jr.,
\\'alter C. Birch, Russell Foss, Simon
Geller, Robert A. Hallett, Warren C.
Reichardt, Evan B. Roberts
Michigan: John DeMyer, Howard W.
Eck
Minnesota: F. L. Biss, Walter F. John-

www.americanradiohistory.com

Foreign
Alaska: S. A. Tucker
Australia: Albert E. Fault, Victoria;
George F. Ingle, New South \Vales;
Aubrey R. urd, ueensland
Canada: William H. Ansell, Saskatchewan; C. R. Caraven, British Columbia; Claude A. Dulmage, Manitoba;
C. Holmes, British Columbia; Philip
H. Robinson. Nova Scotia; Art Ling,
Ontario, John W. Ker, British Columbia

Cuba: Rafael Valdes Jiminez, Camaguey
England: R. T. Coates, Hants; F. R.
Crowder, Yorkshire: George Ellis,
North Stockport; Charles E. Pellatt,
London
Irish Free State: Ron. C. Bradley
Newfoundland: A. L. Hynes, Clarenville
New Zealand: P. T. Kite. Auckland;
L. W. \fathie, Hawke's Bay; R. H.
Shepherd, Christchurch; Eric W.
Watson, Christchurch
Philippine Islands: George Illenberger
Puerto Rico: Ralph Justo Prats, San turce
South Africa: A. C. Lyell, Johannes.
burg
Sweden: John S. Bohm, Malting
Switzerland: Dr. Max Hausdorff, Viganello

BAnlo NEWS Volt DECEMI4h:R, 1935

3-1.3

Madonatt. 50 kw.; 1258 kc., Kuldiga. 10 kw.
IDA
1380 ke., CMBX, Havana. Cuba.
.15 kw.
RADIO NEWS
.iS
1300 kv., WI I. \Z, Troy, N. Y...5 ksv..
4-5 for
CDXC
4:30.5 630 kc., WGI4F, Evansville, Ind.,
.5 kw.
NRC -C DXR
5 -7
1310 ke.. \WTRC, Elkhart. Ind..
.oi kw.
NZDXA
19
I -4
940 ke... 1VD.A \'. Fargo. N. D.. kw.
I:30 -2:30 749 k',.. RADIO MARSEILLE.
Marseille, Fr.. 100 kw.,
IDA
3-4
1230 kc.. CI'X. l.a Paz, Bolivia.
10 kw.
IDA
20 Beg .2:01 1210 ke.,
KI1 -L. Garden City.
Kansans, .I kw
3 -6
1500 kc., WOP I. Bristol. Tenn...1 kw.
2

-4?

3.3:30

CDXR

1310 kc., KGEZ, Kalispell, Montana,

RADIO NEWS

kw.

3.4

1270 kc., CM KC. Santiago, Cuba.

I.3

922 kc., OK It, Brno, Czechoslovakia.
32

NRC

kw.

.1.5

kw.

27 Beg .2:()1 1210

kc.,

KIUL,

IDA
City

Garden

Kansas, .1 kw.
28
11 -6
900 kc., WJ.\X, Jacksonville. Fla..
kw.
CDXR
2') 1:1 5.1:43 986 ke.. 111:
(1enoua Italy, 10 kw.
1

LISTEN FOR THIS STATION NOVEMBER
KGEZ, Kalispell, Montana, 1310 ke., 100 watts, will broadcast

December
1

-2

1310

kw.

2 -3
2 -4

k:., ('J I.

gram for

1040 Ic., ('P4. 1.a Paz. Bolivia. 1(1
kw.: 2 -2:15 IDA: 2:45-3
NNRC
890 kc.. W\i NIX, Fairmont, W. \'a.,

kw.
CDXR
832 kv., RW39, Moscow, C. S. S. R..
100 kw.
IDA
1400 kc.. WIRE. Indianapolis. Ind..

RADIO

.5
2

1.2

3 -3:10

3-3:20

2 -3

2:30 -4:30

2 -3

4-5

14
15

C\IKC. Santiago, Cuba.
15 kw.
IDA
1320 kc.. KID. Idaho Fall, Idaho.
1250 kc.,

NNRC
KFRO. Longview. Texas.
.1 kw.
NNR(1
4:30-5:30 1200 kc.. ('KNX, \\-ingham, Ontario. .05 kw.
CDXR
Beg .2:01 1210 kc..
KICT. Garden City
.t-4

kw.
NNRC
k... WDAS, Philadelphia. Pa.,
RADIO NEWS
kw.

1370

1.1:30

25 kw,
1370 lec.,

Kansas..) kw.

1320 1c., C \IOX, Havana Cuba,
.25 kw.
620 kc., \\'H-I B. Greensburg. Pa..
.25 kw.
CDXR
600 kc., WICC. Bridgeport. C
.5

1.3:30
1

-2

.4.4

kw.

590 kc., WOW. Omaha. Neb.,

kc..

920

.5 kw.
1500 Ix.,

K\'OD,

KDif. Santa Barbara, Calif.,
CDXR

4 -.5

630

4 -5

1310

kw.

k..,

CDXR
CDXR

3 -5

lec.,

kw.

Denver. Colo..

kw.
830 lec., \\'EEU, Reading, Pa.,
.1

kw.

NRC
\\'GBF, Evansville. Ind.,
CDXR
KVOL, Lafayette. La..

kw.
CDXR
1010 kc.. CH\IL, Hamilton, Ontario, .05 kw.
CDXR
1310 ke.. \1'TRC. Elkhart. Ind.,
.03 kw.
CHRISTMAS PARTY
.1

5 -6
5 -7

Dan

2:10 a.m.

Tuesdays-

2:30-3 a.nt.

üursdoys8

PERIODIC
1030 lee., KF141, Abilene, Kansas,

L.P.O. BUITEKANT, NEW' YORK
da amie'[ DX'er, .11r. Buitekant in
addition to being a R.Ablo News Observer, is also first l'ire -President of
the Globe Circlers' DX Club. The re(river is a Majestic 10 -tube super.

11-11:15 p.m.

briduy:s-

8:45-9 p.m.

.'iUlnrdUr.t-

)

-***c.
-e.e.

.25 kw.

kc., WORK,

1320

kw. (NRC)

York. Pa..

1010 kc., CKCK, Regina. Sask..
.5 kw. (tips)

City.

1530 kc., \V9X151'. Kansas

Mo., kw. (tips)
980 kc., KDKA, Pittsburgh. Pa.,
50 kw. (DX tips)

1360 kc.. \WQBC, Vicksburg.
Mims., 1 kw. (tips)
kc.. \\'EEC. Reading, Pa..
p.m.
830
3:30.3:45
kw. (tilts)
3

p.m.

Stndays-

12:+5 -I a.m.

a.m.

WTCN,
kw. (DX tips)
KFI, Los .Angeles.
kw. (DX tips)

1250 lec.,

Minn..
640

k.c..

Calif., 50

CJCA. Edmonton,
Alberta, kw.
1380 kc., CMBX. Havana.C,tba,
.25 kw.
730

lec.,
1

2 -3

a.m.

Consolidated Foreign "Best
Bets"
Following is a li't of the foreign stations being
heard by Official Observers in different sectians
of the U. S. and Canada. Wherever either an
asterisk ( *) or a number appears in a column[
it indicates that the station has been heard in
the section represented by that column. Where
a number appears it represents the approximate
local time when the station is heard. Heavy
bers represent p.m. and light numbers a.m.
This list is made up front observers' reports
(New England) --Ole
as follows:
Col
servers Hammond and Reichardt; Column 2
(New York. Ontario)- Observers Kentzel, Ling,
Lon is, and Tomlinson, Cohan[ .3 (Penisvlvaun ia.
Virginia)-Observers Routzahn and Wilson;
Column 4 (\lississi tail- Observer (Mrs.) Ledbetter; Column i (Minnesota)- Observer John.
son; Column 6 (West Coast)- Observers, hunt.
Hinter and Sholin.
The location and tower of the European sta.
tions listed will be found in the European Call
List elsewhere in this issue: of the TI "s, in the
Asiatic Call List Published last month.
(Note: Official Observers and other readers
are invited to send in a listing of foreign sta.
Huns heard each mouth. In doing so it will
facilitate matters if stations reported are made
lip in the form of a list giving the frequency,
call, location and hour (your own local tittle)
when best heard.)
1

574

kw. (tips,

900 kc., KSEI. Pocatello, Idaho,

11-11:30 p.m.

Kc.

p.m.

CDXR
I

a special DX proNEws listeners on the above date at 5 -5:30 a.m., E.S.T. Their
trans(n'tier, s /io4cn abort, was designed by Donald G9rman. KGEZ's chief engineer.

Yarmouth, N. S..

590
630
640
650
670
681
720
730
740
750
750
750
770

770
780

800
8.40

830

Cell
Stuttgart
XEPN
3AR
5CK

IVA

2C0
HJN
3YA
5CL

I
7

5
5
5

5
5

JOBK-1
7NT

CKSO
4QG
I.R+

5
5

4
s

Celf

832
F40

RW.49

850
850
870
870
870
910
910
910
920
932
940
950
950
959
960
960
960
990
990
1010
1013
1020
1022
1031

1050
1050
1095
1110
1113
1120
1140
1150
1175

1180
1180
1190
1170
1195
1200
1220
1230
1230
1240
1270
1270
1290
1380
1380

14t0
1460

I
-

CMQ
JOFK

TIEI'

JO.\ K-1
I.R6
2GB

XENT

LR2
4RK

HUK

PRF4
CM BC

I-R3

2(,E

Prate Parisien

7
_

YW1RC

XEAW
C\IC'D

LR4

XEK
3H.\

Midland Reg.

2K\-

E.\J-15

7
7

CTIGI-

CX26
2CA
EAJ7
2L'1\
Radio-Norma odic
4BC
11 TO
LR8
JOCK-2

;

7
.i
7

2CH

3KZ

5
s

LS2

4TO

5
7

Frankfurt

Y\3RC
4A K
LS8
2NC
1WKAQ

2S\I
LS9

461:
4BH

5
5

2K0

C\IBN
71J\'

F.C.C. Monitor Schedules
The complete schedule of monitor trutsmissions during the first week of each month was
given in this department last month. Since that
reports indicate only two
t mie govrnuucnt
changes, in the form of additions to the list, as

follows:
Monday. 3:10 5:30 a.m., \WCAC, Storrs, Conn.,
600 kc.

Wednesday. 5:50.6:10
Oklahoma. 1210 kc.

a.m.,

K\' OS. Ardmore,

DX Club Register

3L0
JOHK

281,

KGU

Ke.

.is

JOIK

www.americanradiohistory.com

listing of all clubs but
additional information has been received front
two of then[ and is (liven herewith. Iu formation
on other leading IIX clubs was given in the IIX
Corner of the October issue.
The Universal Radio DX Club. 2018 Green
Street. San Francisco. California; ('harles C.
Norton. President.
World-wide membership.
\temlxrsh ip fee nul dues $1.00 for one year.
including weekly bulletin.
The Plainfield IIX Club, 431 \Watdnntg Avenue, Plainfield. New Jersey: Harold J. ('lark.
Secretary.
Nation -wide ntenthership but residents of any of the Plaintields of the United
Space does not permit

States particularly welcome.

Initiat inn

fee and

RADIO NEWS FOR DECEMBER,

1935

WKAQ, good volume, bad interference.
Finds TA's coming through best from 6 to 7 p.m.
EST and offers the following notes: Fecamp,
1113 kc., heard most every night about R3. Bad
QRM. Seems to run the IBC program each
evening now. Frankfurt, 1195 kc. same. Between 6 and 7:30 p.m. announces in several different languages; German, English, and others
days.

can't make out yet. Best signal R4. Turin, 1140
kc. bad ORM but heard two evenings right after

Signal reaches R7 at
p.m., with singing.
times, drowning out all others on 1140. RW39,
832 kc., quite sure this was the Russian. Logged
enough for a verification 5 to 5:16 p.m. Time
checks with his schedule. Signed off with lady
doing announcing and the International by large
Also lists 14 South
orchestra, or recording.
Americans which he receives best between 7:30
and 8:30, with LR3 good all evening. Observer
Tomlinson inquires as to what Spanish speaking station on about 1095 kc. leaves the air at
7 p.m.
He believes it to be EAJ7 but has not
completely identified it. Can anyone help him
on this?
Observer Routzahn (Pennsylvania): "Have
just completed my version of the Radio News
Tenatuner and believe me I was greatly surprised at the results I obtained on it. Stations
which have been very weak, come in nearly like
locals. I heard a few ball games with it that
I would not have heard otherwise and I hope it
does the same thing in bringing in DX stations
later in the season."
Observer Wilson (Virginia) has been hearing
a station in the background of WBT on 1080 kc.
They seem to go off the air at 7 p.m. and speak
a foreign language which is not Spanish. Thinks
it may be Bordeau and asks for dope from other
listeners.
Observer (Mrs.) Ledbetter (Mississippi) 6

LISTENING POST OF ROBERT BASE, BALI IMMORE
His 23 -tube Scott All -Wave Imperial is shown, surrounded by a mass of verifications from stations heard by Mr. Base.
membership card 25c, annual dues 50e. Members receive DX tips bulletin, called the 'Red
Nite Owl." Official verification card forms on
sale to members.
Additional information on either of these clubs
may be obtained by addressing an inquiry to the
editor of this department.

Correspondents Wanted
The following DX'ers would like to correspond
with fellow DX'ers in the U. S. and Canada:
Norman Keys, 2 Jean St., McKinnon S. E. 14,
Victoria, Australia.
Charles E. Pellatt, 5 Brackley St., Golden Lane,
London E. C. 1, England.

Interclub Cooperative "Plan"
For several years there has been a movement
on foot to correlate the activities of the various
DX clubs in arranging special DX broadcasts to
avoid interference resulting when two independently arranged specials took place on the same
frequency at the same time. Unfortunately these
efforts were handicapped in previous years by
the inability of the clubs to get together on a
basis of mutual agreement and cooperation. This
year, however, a plan has finally been worked out
on which all of the important clubs could agree.
As a result the Interclub Cooperative "Plait'
is now in operation.
The following list of rules explain the activity

quite thoroughly:
1. "The CPC Chairman of each club will send
a weekly report to the "Clearing House' listing
all DX'es definitely arranged, the notification to
show call letters, frequency, location, date and
Eastern Standard Time (frequency check dedications excepted)."
2. "The (,PC Chairman of each club will receive a weekly report from the Clearing House,
listing all DX programs and the Club which arranged the program. It will be the duty of each
memCPC Chairman to advise his committee
bers not to arrange any DXes that will clash with
arranged."
those already
3. "Each club agrees that under no circumstances will they make unfair use of the information supplied them by the Clearing House reports,
This includes the agreement that no club will
write to a station scheduled for a DX program
for another club and ask to have a portion of
club."
that DX program dedicated to their
4. "Each club agrees that for all foreign DXes
the
foreign DX
utmost
to
give
they will do their
broadcast a clear frequency for the period of the
to
also
keep
the
adjacent
DX, and if possible
frequencies clear. Cuban and Mexican programs
foreign."
considered
will not be
5. "Each club agrees that it will not publish
anything in its publication that will in any way
be offensive to another club in the plan."
6. 'Each club agrees that it will not use the
publications of any other DX Club in the plan,
to secure the misses and addresses of members
of other DX clubs and then write to them soliciting their membership."
If the clearing house shall receive notice
7.
of two programs on the same frequency for the

same period, the notice which shall have the
earlier post mark shall receive priority-except
foreign programs, which will be given priority
in all cases. The clearing house shall immedi.
ately notify the sender of the conflicting program
of the necessity of cancelling the conflicting
broadcast."

8. "Each club agrees that it will not publish
or publicize the D. programs arranged by an-

other club without the permission or request of
the president of that club. When permission is
granted, clubs listing DX programs arranged by
another club will give credit to the club that arranged for the DX. If any program is to be
shared with another club. it shall be so listed and
credited."
The "Clearing House" referred to is operated
by Miss Emily Griswold who, for the betterment
of DX'ing, has volunteered for this service without compensation.
To date the organizations participating in the
"plan" are: The Canadian DX Relay, Goderich,
Ont.; Newark News Radio Club, Newark, N. I.;
International DXers Alliance, Bloomington, Ill.;
National Radio Club, York, Pa.; Globe Circlers

Club, Brooklyn, N. Y.; Universal Radio
DX Club San Francisco, Calif.; Mid -Co DX
Exchange, Wichita, Kansas. The Radio NEWS
Broadcast Band DX Corner has recently been
added to this list and it is lending its wholehearted support to the "plan."
The "plan" has been functioning in full stride
since early in September and to all appearances
is meeting expectations in every respect. Thus

the ideal for which many DX club executives
have been striving for yars bas apparently been
attained. Elwin H. Bullard, Chairman of the
Courtesy Program Committee of the Canadian
DX Relay, deserves unlimited credit for his untiring efforts towards the inception and organization of this activity. He has worked tirelessly
towards this end and deserves a vote of thanks
which is hereby heartily extended to him on behalf of all of the RADIO NEWS Official Listening
Post Observers.
Should there be any other DX clubs who wish
to become active participants in the "plan" it is
suggested that they communicate with Mr. Bullard whose address is P. 0. Box 170, Drummondville, Quebec, ilfr. Bullard writes that all
clubs not now in the "plan" but who are willing
to subscribe to the 8 rules given above are cordially invited to apply for membership.

Our Readers Report

Observer Hammond (Maine): "Not much
luck with the TP's to date as static is still bad.
IVA heard but very weak. My log stands at
712 with 281 verified including several TP's,
European and South American.'
Observer Reichardt (Massachusetts): "On
Sept. 11 I had PRF -4 on 923 kc. very good.
Heard also YVIRC. L* -6, and LS -2. On Sept.
9th I tuned in 25 TP's (G -Good F-Fair, and
3YA -P,
P -Poor) 5CK -G, 7NT -G, 2BL -G, 2óB
5CL -F, 3LO -F, 40G -G, 4RK -G, 3HA -G, 2KY -F,
2CH
-G,
3KZ
-F.
2UE -P,
4T0-G,
4BC.G,
2CA -F,
2CO -P, 2UW -P, 2Sìí -F, 4BK.F 4BH.G, and
2KO -G. 7UV also coming in. 'these are best
4:30 to 5:30 EST. Early in the evenings I have
heard Fecamp, Frankfurt (on until 8 p.m. EST)
also Stuttgart, EAJ -7, CTIGL, EAJ -15, PP, MR
and Turin. The best time is 6:15 to 7 p.m. ES-1'
on Saturday nights."
Observer Ling (Ontario): "IYA is the only
TP coming through although several carriers have
been heard."
Observer Louis (New York) reports that the

-G,

DX season opened up early in his location and
that he has heard: 5CK Sept. 8, 9, 10, 13;
IYA, Sept. 7, 9, 11, 12, 13, 14, 17; 2CO, Sept.
6, 7, 8, 9, 11, 12; 2BL, Sept. 7, 8, 9, 11; 7NT,

9, 177; 3L0, Sept. 6, 7, 8. 12, 13, 17;
6,
Sept, Sept.,
Observer Tomlinson (New York) reports
IYA, 5CL, 3YA, MR, and 7NT heard well

enough for verification purposes, with 7NT coming in best of all. HHK, 921 kc., heard on Fri-

Although September

static

ran high reports IN A

nearly every morning she tried for it. 40G
heard September 8th at 5:29 a.m. Is also hearing 3YA and heard 2BL (on its old frequency,
prior to Set. 1st) Japs heard are JOHK (5:07
a.m.), JOIE, JOFK and JOAK -1. She says
further: "Reception here is not usually good before October 1st. August reception of the TP's
was a surprise to me.'
Observer 'Johnson (Minnesota): "I have just
erected a new cage antenna 48' in length, 4 wires
(enameled) of 7 strands each, 35' high. The
improvement in signal strength is very welcome,
and with the Tenatuner just made I hope to get
some very good DX this year. 3A puts in a
signal almost equal to 1YA in strength. I heard
11'A sign off one morning at 6:30 a.m. EST,
and 3YA 8 minutes later (Sept. 13)."
Observer Sholin (California) : "The weather
at present (September) is still
quite warm.
JOHK, 770 kc. is the best Jap at present, being
R6 at 4 a.m. PST. JOIK, 830 kc. is R5 at 4
a.m. PST. All other IO kw. Japs are heard but
with poor volume. They are best heard as they
sign off between 4:30 and 5 a.m. PST. The NZ
and Australian stations are weak but are heard
best at 2 -3 a.m. PST."
Observer Hunter (Oregon): "The TP's are
coming in best at about 5 a m. EST, the best
ones being IYA, 3YA, JOAK -1, JOBK -1,
JOCK -2, JOHK and JOIK. Heard the WIRE
broadcast for RADIO NEWS Sept. 4th and sent
them a report. Have now logged 464 stations,

(Turn to page 365)

OBSERVER LONIS'

LISTENING POST
With his 7-tube Philco L.P.O. Lonis,
Hannibal, N. Y., has chalked up numerous foreign catches including South
American, European, Hawaiian, Australia and New Zealand stations.

RADIO NEWS FOB DECEMBER,

1935

345

Testing the Taylor-Cockaday

"Ocean Hopper"
By John H. Potts
Part Two
IN

presenting the description of the
"Ocean Hopper" receiver last month
the statement was made Japanese
and Australian stations were successfully tuned in during the very brief
preliminary tests of the completed receiver. Since that time additional tests
have been conducted at the Fairfield
and Westchester Listening Posts, resulting in an enviable log presented
here. It may be well to point out that
these tests were made mostly in the daytime and that every station listed was
positively identified. Because of the tests
being largely limited to daylight the best
results were, of course, shown on the
higher frequencies. However, enough 49
meter stations were tuned in during
brief evening operation to show conclusively that the effectiveness of the
receiver extends throughout its entire
range. The stations logged are listed at
the end of this article.

Also a Good Ham Set
Just to show that the utility of the
"Ocean Hopper" is not limited to shortwave broadcast reception a little time
was spent tuning in 20 meter amateur
phone stations, among which were the
following west -coast and foreign stations,
TI2AV, HP1A, TI3AV, W6BUT PortHPIXE, TI2RC, W6CQG,
able,
W6CAM, W6CEP, XIG, XIQ, X1HH,
HC1FG, VPSPZ, VE4CW, VE3GS,
vol!, G6XR, LU6AP, G6GO, F8DR,
VE4HD, VESEH, W6LGD, PY1CK,
G5ML, HH5PA, VP9R, VE2BA, VE3GS
and W7CGR.
In the article last month it was stated
that the designers of this receiver had as
their primary object the development of
a receiver which would insure loudspeaker reception from all parts of the
world. The following lists leave little
doubt concerning attainment of this desire because all reception during the

testing of this receiver was on the
loudspeaker.
The receiver as it
stands provides an

excellent signal-to-

"ON THE AIR" TESTS
noise ratio. In noisy
William
Dorf
C.
at the controls in the Westchester
locations, however,
Listening Post. The receiver lived up to its name magit is sometimes necnificently, spanning oceans in all directions.
essary to do everything possible to rein figure 2(b). The manufacturer's
duce noise to a minimum and for that
recommendations should be carefully
reason it was decided to add a simple
followed in all doublet installations,
tone control. The method for connectparticularly as to the grounding of the
ing this into the circuit is indicated in
electrostatic shield which is used in
Figure 1. It consists of an Electrad,
many types of doublet transformers.
Type 997 variable resistance of 40,000
During the coming month steps will
ohms and a .02 mfd. condenser which
be taken to provide headphone connecreplaces condenser C8 of the original
tions and perhaps other refinements.
This work should be completed in time
to permit publication of the dope in the
BLUEPRINTS
next issue of RADIO NEWS.
RADIO NEWS "Ocean Hopper"
blueprints are available for
Log of the Ocean Hopper
50 cents per set and include full Wavesize chassis layout drawings, full length Call
Frequency
City
Meters Lettera
size picture wiring diagram, etc.
Ka.
Country
19.5
W2XAD
15330 Schenectady, N. Y.
Order direct from: RADIO NEWS,
19.6+ DJQ
15280 Zeesen, Germany
Blueprint Dept., 461 Eighth Ave19.6+ GSI
15260 Daventry, England
nue, New York City.
19.6+ FYA
15245 Pontoise, France

circuit. The variable resistor may be
mounted in the unused hole provided
on the front of the original chassis. If
the constructor's location is a reasonably
quiet one the tone control will not be
needed but where the receiver is to be
operated under conditions of high local
noise this addition will be advantageous.
Any type of antenna may be used
effectively. The antenna coil primary is
isolated from the chassis. If an L type
antenna is used, the method of hooking
up is shown in figure 2 (a). The middle
antenna post is joined to the ground
post and to the ground connection. A
doublet antenna is connected as shown

ADDING A TONE CONTROL
At the right end of the front chassis
wall is the tone control, mounted in
a hole

PCI
W8XK
DJB
GSF
HVJ
19.9+ RKI
21.2+ HJ5ABE
22.7+ ORP
24.9+ RV59
19.7
19.7
19.7
19.8
19.8

25.2

25.2+
25.3+
25.3+
25.4+
25.5+
25.5+
25.6+
27.2i27.9+

FYA

W8XK
W2XE
12R0

DJD

GSD

.CJRX
HJ4ABA
PLP
JVM
JVN

29.0+

30.4+
31.2+
31.2
31.2+

1003

EAQ

CTIAA
HBL

liP5J

9860
9600
9595
9590

Huizen, Holland
Pittsburgh, Pa.
Zeesen, Germany
Daventry. England
Vatican City
Moscow, U.S.S.R.
Cali, Colombia
Ruysselede, Bela.
Moscow, U.S.S.R.
Pontoise, France
Pittsburgh, Pa.
New York, N. Y.
Rome, Italy
Zeesen. Germany
Daventry, England
Winnipeg, Canada
Medellin, Col.
Bandoeng, Java
Nazaki, Japan
Nazaki, Japan
Ruysselede, Belgium
Madrid, Spain
Lisbon, Portugal
Geneva, Switzerland
Panama City, Pana.

(Turn to page 365)

GND.

which was unused in the original receiver.

15220
15210
15200
15140
15123
15040
14110
13200
12000
11890
11870
11830
11810
11770
11750
11720
11710
11000
10740

AN17

ANT.

o -A-

FIG.2
GND.
O

TO DOUBLET

I
ANT.

-B-

www.americanradiohistory.com

ANT.

14(3

RADIO NEWS FOR DECEMBER,

1935

DEDICATED TO R. N. OFFICIAL

(Prese letto r- Con ve rte r
It

that short -wave and broadcast
reliable unit that will bring them the
band reception including more than
selectivity. This unit is, therefore, not only
that insures good distance reception when
EASY TO CONSTRUCT
Notice the simple layout, which consists mostly of the P.C.A. unit that
may be obtained all wired-up. About
the only wiring the constructor has to
do is for the three components for the
power supply, at the left.

By
L. M. Cockaday

H. J. Benner
Glenn H. Browning
in 1935 the writers were disEARLY
cussing converters and the observation was made that a converter could be

designed which, when connected

the design of this preselect or -converter- amplifier, the shortcomings
of the ordinary converter of a
year or so ago were clearly kept in
mind. Consequently, the design to be
described consists of a sharply -tuned
antenna circuit and one stage of radio frequency amplification before the converter tube. Thus. inherently amplification as well as selectivity and image
SENSITIVITY

Microvolt Sensitivity

The broadcast receiver to which the
Observer is attached acts really as an
i.f. amplifier. second detector, and audio
amplifier. A specially- designed transformer connects the output of the Ob-

E--ó

F-

6A8
o

ó<
x

20,000

MFD.

OHMS

server directly to the antenna -ground
system of the broadcast receiver. Practically all receivers will tune to a frequency of 550 kilocycles. Consequently,
this was chosen as the intermediate frequency that would be most suitable, for
it was found under those conditions
that the Observer would tune throughout the broadcast band up to about 560
kilocycles or within about 10 kilocycles
of the intermediate frequency. The Observer operates satisfactorily with any
radio receiver whether it be a t.r.f set
of a superheterodyne. In fact, the
writers have used it successfully with
one of the pocket -type International receivers whose sensitivity is several hundred microvolts and obtained very excellent foreign reception. When the
Observer is used with a broadcast receiver the sensitivity of which is adjusted to about 800 microvolts, the
overall sensitivity provided is 5 microvolts (or better) all over the tuning
range of the Observer, while if the sensitivity of the radio receiver is adjusted

6K7

CONVERTER AMPLIFIER
1.F. 550 KC.
SENSITIVITY OF LK AMPLIFIER, IOOjN.

PRESELECTOR

suppression is obtained in this apparatus itself.
The P.C.A. "Observer" (preselectorconverter- amplifier) is a complete unit
in itself and is designed primarily to be
placed some distance from the radio
receiver to which it is connected, although of course this is not essential.
In fact. the writers had in mind that it
would be convenient to have a tuning
device located by one's easy chair which
would have complete control of the DX
radio programs being received. that is,
the operator may tune in distant stations on either broadcast or shortwave bands and have at his control the
intensity of the output signal as well as
the "on-and -off" switch. Here's DXing
with Comfort!

to a

broadcast receiver, might cover broadcast
as well as the short-wave bands, but at
first the feasibility of such a design did
not look very promising. However, experimental facts bore out the contention
that this type of device was entirely possible and final checks showed the idea
was a "natural."

is seldom

MEG.

OHMS' -

lJ
T

.002 MFD

-l
MFD.

o°

"..0001

MFD.
TO

300

SET

OHMS

GND

30,000

OHMS

.1MFD.

FIG.1

L--------

-SAN D3

BAND

z°zz

mm
.6

2.5
6.0

3.0
8.0

1.s1J.

10
3.5

1.2

40'

1.6

5.0

5.5

10.0

12.0

14.0

16.0

18.0

FREQUENCY IN MEGACYCLES

-J

TO 115Y, A.C.

FIG.3

SW.

6.3
V.

PLUG FOR _ RADIO SET

8 MFD.
TAd

RADIO NEWS FOR DECEMBER,

1935

S.W. AND B.B. L.P. OBSERVERS

Observer"
and eXmplifier)
band listeners can buy an efficient and
"utmost" on both shortwave and broadcast
sufficient sensitivity and over-abundant
the first all -wave unit of its type but one
used with even mediocre receiving sets.
to 100 microvolts the Observer provides an overall sensitivity, for the
bands covered, of about 1 microvolt.

This latter sensitivity is usually greater
than can be used except under favorable atmospheric conditions.

Only One of Its Kind
As indicated before, the P. C. A. Observer may be located some distance
away from the broadcast receiver. A
socket connection for plugging in the
broadcast receiver is provided in the
rear of the chassis so that the "off -andon" switch will control both units. The
only other connection between the two
units is a lead which carries the intermediate- frequency currents from the
transformer output to the antenna post
of the broadcast receiver. This does
not have to be shielded except in the
case where a local station has a broadcast frequency near 550 kilocycles. In
such a case shielding is necessary so
that broadcast stations will not be
picked up on the lead between the re1000

we=-

1000
KC.

o
o
re
ó
z

MII

IM
550 KC.

I.F.

l00

I..

zz
pzp

W W

ó<
S

FIG. 2

zzt0
o
<

(t.

2
t

-20

-5- 0

5 0 5 to 15
KC. OFF RESONANCE

ceiver and the Observer. Generally it is
not necessary to ground the two units
together, as the lighting circuit performs this operation satisfactorily. In
all cases, however, it is advisable to determine whether or not a direct ground
connection between the two is necessary. If there is any hum in reception,
reversing the A. C. plug will remedy it.
The Observer covers a frequency
range from .56 to 18 megacycles in
three bands. Band No. 1 has a range
from 5.6 to 18 mc.; band 2 from 1.7
to 5.7 mc.; and band 3 from .56 to 1.84
mc. The three sets of three coils each

LISTENING FOR WAR NEWS
Glenn Browning, at left, and your
editor using the Observer for checking up war news transmissions from
Libya, Eritrea, and Ethiopia.

are placed in a tuning catacomb with
shields separating the antenna, r.f., and
oscillator coils. Coil- switching is employed and the switch blades are
mounted in the same catacomb as the
coils. The switching is so arranged that
all coils in the tuning catacomb, not being employed in the circuit, are automatically short- (Turn to page 380)

7(_ew

ALL -WAVE

TUNER
600)
By Richard Feeney
Wilco Model

this new all -wave 6 -tube superheterodyne tuner there is an excellent opportunity for sevicemen
and radio dealers to multiply their
profits in modernizing obsolete radio
sets or by adapting it as a complete upto -date tuning unit for all manner of
public-address systems.
There are thousands upon thousands
of old sets whose owners hold on to
them for one or more reasons, perhaps
chiefly because the cabinet is made
from beautifully finished woods and its
period design was selected to harmonize
with their particular decorative scheme.
Also, owners of 6- or 7-year -old sets
contend with poor selectivity and sensitivity and other drawbacks of the tuning circuit, because their audio amplifier system, using such power tubes as
the 45 and 50 types is capable of providing enjoyable quality of reproduc-

www.americanradiohistory.com

LOGGING S.W. STATIONS
An official Observer at Nie Westchester
Listening Post tries out the new unit
for DX short-wave reception.

tion. It would appear certain that such
owners would be glad to know that they
can still retain their cabinets and present audio amplifiers and by the addition
of this new tuner be able to bring their
receiving equipment up -to -date with
short -wave tuning ranges to receive
foreign reception. There are any number of sound reproducing systems employing antiquated r.f. tuners and many
that are without any tuner at all, both
of which should provide fertile fields
for this new compact easy-to- install
(Turn to page 369)
tuning unit.

348

film)

NEWS FOR
DECEMBER)

1935

EVE

RADI O
WORLDWIDE

SETS

TUBES- ACCESSORIES
REPLACEMENT PARTS

SERVICEMEN SUPPLIES

TESTING EQUIPMENT

LABORATORY EQUIPMENT

AMATEUR EQUIPMENT

EXPERIMENTERS' PARTS

S. W. APPARATUS

SET- BUILDERS' KITS

PUBLIC ADDRESS

UWE

Allied Radio
ATI

833

C O R P O

w. JACKSON BLVD.

O N
CHICAGO ILL.

11. urlo

NEWS FOR DEC t:>tHER,

1935

349

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any size
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radio stock in the country. Buy for less and

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Name

Address

City

www.americanradiohistory.com

State

RADIO NEWS FOR DECEMBER,

:3äO

1935

DX
for the
HP5B PANAMA CITY, CANAL ZONE
Here is a reproduction of a photograph of station 11P5B, the

Conducted by

Club Miramar, taken by O.L.P. Foshay, on his recent South

Laurence

American trip.

THE

thirty -third

installment

the

DX Corner for Short Waves contains the World Short -Wave Time -Table
for 24 -hour use all over the world.

Affiliated DX Clubs
We are hereby placing a standing
invitation to reliable DX Clubs to become affiliated with the DX Corner as

Associate Members, acting as advisers
on short -wave activities, in promoting
short -wave popularity and reception
efficiency. A list of associate organizations follows: International DX'ers
Alliance, President, Charles A. Morrison; Newark News Radio Club, A.
W. Oppel, Executive Secretary;
Society of Wireless Pioneers, M.

Mickelson, Vice -President; U. S.
Radio DX Club, Geo. E. Deering, Jr.,
President; the Radio Club Venezolano,
Venezuela. President, R. V. Ortega;
The World -wide Dial Club, President,
Howard A. Olson; International 6000 to 12,500 -Mile Short -Wave Club, Oliver
Amlie, President, Joseph H. Miller,
Vice -President; Globe Circlers DX
Club, W. H. Wheatley, President;
Radio Fellowship, M. H. Ryder, Chairman; Short Wave Club of New York,
H. C. Lange, President.

Any DX fan wishing to join any one of
these Clubs or Associations may write for
information to the Short -Wave DX Editor,
and his letter will be sent to the organization in question. Other Clubs who wish
to become affiliated should make their application to the Short -Wave DX Editor.
Clubs associated with the DX Corner have
the privilege of sending in Club Notes for
publication in RADIO NEWS.

Your DX Logs Welcome
Please keep on sending in your information on any S.W. stations that you hear
during the coming month, getting them in
to the short -wave DX Editor by the 20th
of the month. In this way you share your

1
L

OIL

á.

.,.:.
,.:.
'Y:L
_..

.... ..

.
.

-._.
14.4

Nt.

h9e1

AN OBSERVER IN BAGDAD
Official Radio News Short -Wave Listening Post Observer Ilagop Kou youmdjian of Bagdad, Iraq, a faithful
reporter.

THE WORLD'S ORIGINAL ORGANIZATION OF
S.W. PIONEERS
Official RADIO NEWS Listening

Post Observers

below by states are the Official
L
ISTED
RADIO NEWS ShortWave Listening Post
Observers who are serving conscientiously in

logging stations for the 1)X Corner.
United States of America
Alabama, J. E. Brooks. L. T. Lee. Jr.,
William I). Owens ; Alaska, Thomas A.
Pugh ; Arizona, Geo. Pasquale; Arkansas,
lames G. Moore, Don Pryor, Caleb A.
Wilkinson; California, Eugene S. Allen, A.
E. Berger, C. H. Canning. Earl G. DeHaven,
G. C. Gallagher, Werner Howald, Wesley W.
Loudon, Robert J. McMahon, Oriente I.
Noda. Jr., Geo. C. Sholin, James E. Moore,
Jr., Phil E. Lockwood, Hank G. \Vedel,
H. H. Parker, Fred A. Pilgrim, Douglas S.
Catchim, Frank C. Andrews, Fred M. Craft,
Radio Fellowship; Colorado, \Vm. J. Nette;
Connecticut, H. Kemp. Geo. A. Smith, Philip
Swanson. I. Herbert Hyde; District of Columbia, Phillip R. Belt; Florida, James F.
Dechart, George H. Fletcher. E. M. Law;
Georgia C. H. Armstrong. Guy R. Bigbee,
lames L. Davis, John McCarley, R. W.

Winfree; Idaho, Bernard Starr, Lawrence
Swenson ; Illinois. E. Bergeman, Larry Eisler. Robert Irving. Charles A. Morrison,
Phillip Simmons, Samuel Tolpin, Ray A.

Walters, Floyd Waters, Robert L. Weber,
J. Ira Young. Evert Anderson, Eddie C.
Tarn, Louis Horwatb, Jr.; Indiana, Free.
man C. Balph, Arthur B. Coover, J. R. Flan
nigan, Henry Spearing. B. L. Cummins;
Iowa, J. Harold Lindblom ; Kansas, C. W.
Bourne, \Vm. Schumacher; Kentucky, Geo.
Krebs, Charles Miller, \\m. A. McAlister,
Jantes T. Spalding, W. W. Gaunt. Jr.;
Louisiana Roy W. Peyton Maine Danford L. edams, M. Keith Libby, Vincent
M. \Vood, R. C. Messer ; Maryland Howard
Adams. Jr., J. F. Fritsch, James W. Smith,
August J. \Volker, Forrest W. Dodge;
Massachusetts Armand A. Boussey, J. Walter Bunnell. Walter L. Chambers, Arthur
Hamilton, Sydney G. Millen, Harold K.
Miller, Elmer F. Orne, Roy Sanders. Donald
Smith, Robert Loring 1 oung. James B.
Robbins ; Michigan, Ralph B. Baldwin, Stewart R. Rupple, Jerry M. Hynek; Minnesota,
M. Mickelson, E. M. Norris, Dr. G. W.
Twomey, \'alter F. Johnson ; Mississippi,
Mrs. I.. R. Ledbetter ; Missouri, C. H.
Long; Montana, Henry Dobravalny Nebraska, Hans Andersen, P. H. Clute, Harold
Hansen, G. W. Renish, Jr., Louis T. Haws;
Nevada. Don H. Townsend, Jr.; New Hampshire, Paul C. Atwood, Alfred J. Biennia;
New Jersey, Wm. F. Buhl, Wm. Dixon,
Morgan Foshay, George Mona. R. H. Schiller, Paul B. Silver, Earl R. Wickham; New
Mexico, G. K. Harrison ; New York, Don
aid E. Borne, John M. Borst, H. S. Bradley.
;

Wm. C. Dorf, Capt. Horace L. Hall, Robert
F. Kaiser. Jahn C. Kalmbach. Jr.. I. H.
Kattell, W. B. Kinzel, Wm. Koehnlein, T.
Knapp, A. J. Leonhardt, Joseph M.
T.
NIalast, S. Gordon Taylor, Edmore Melonson, Joseph H. Miller, R. Wright, Harry
E. Kentzel, Howard T. Neupert, A. C. Doty,
Jr., Thaddeus Grabek, Ken L. Sargent,
Robert T. Flynn ; North Carolina W. C.
Couch. E. Payson Mallard, H. O. Murdoch,
Jr.; North Dakota, Bill Bundlie; Ohio, Paul
Byrne, Charles Dooley, Stan Elcheshen, Al.
bert E. Emerson, Samuel J Emerson, R. W.
Evans, Clarence D. Hall, William Oker. Donald W. Shields, C. H. Skatzes, Carl P. Peters.
Orval Dickes, Edw. DeLaet, M. L. Gavin,
Charles \V. Krier ; Oklahoma. H. L. Pribhie, Robert Woods. \V. H. Boatman;
Oregon, Harold H. Flick. Geo. R. Johnson
James Haley. Ernest R. Remoter, Ned
Smith, Virgil C. Tramp; Pennsylvania,
Oliver Amite, Harold W. Bower, Roy L.
Christoph, R. O. Lamb, John Leininger.
Geo. 'Alley, Edward C. Lips, Chas. Nick.
Hen. F. Palm, C. T. Sheaks, K. A. Stoats.
F. L. Stitzingcr, Walter W. Winand, J. B.
Canfield, Charles B. Marshall, Jr., S. G. De
Marco ; Puerto Rico, Manuel F. Betances,
A. N. Lightbourn ; Rhode Island, Carl Schradieck, Joseph V. Trzuskowski; South Carolina, Edward Bahan. Ben F. Goodlett : South
Dakota Paul J. dime; Tennessee, Chas. D.
Moss, Eugene T. Musser Darrell Barnes;
Territory of Hawaii, O. F. Sterneman, A.

RADIO NEWS FOR DECEMBER, 1935

:;.;

C orner
SHORT
WAVES

-LA VOZ DE LOS LABORATORIOIS"
.Morgan Fos /ray, left, visits H11ABE. Next to him, left to
right, are: R. Tron,oso (Spanish announcer), A. Feunhs,
A. Basmagi, R. Feuntes and V. C. Longano.

M. Cockaday
"Best Catches" with other readers and
they. in turn, share with you, making for
improved knowledge on short -wave reception. Also send in any corrections or
additions that you can make to the shortwave identification charts, including station addresses, station slogans, station announcements, and any identifying signals
the stations may have.
To save a lot of wasted effort for our
editors it would be best if our Observers
use a standard form for their reports of
new stations or station changes. We have
found a system of paragraphs, in exactly
the following procedure, most convenient:
"JVH, Nazaki, Japan, 20.5 meters,
14,600 kc., daily 12 m. to I a.m., EST,
irregularly testing 3 p.m. EST."
In other words, use one paragraph to an
item and also indicate whether data was
from a veri, an announcement or other

source.

Let Our Organization Members
Vote on the Following!

the Bureau of Standards, at Washington,
and converted all figures tO wavelength.
using them. It is unfortunate, however,
that station "frequencies" are allocated
and the "legal" speed used in these allocations is still 300,000,000 meters per second, rather than the more accurate figure.

When the DX Corner for Short Waves
first started it was the idea to try to haw^
our figures of wavelength and frequency as
accurate as possible. The conversion figures for these two important identifications
depend upon the speed or the velocity of
light. We, therefore, decided to use the
latest and most accurately determined velocity and we obtained these figures from

roooM -i
ór-

This has given our time -table a slightly
lower wavelength for all stations than
those specified in the government lists.
Your editor actually believes (for the sake
(Turn to page 354)

mum N

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HAS HEARD ALL CONTINENTS
Imagine yourself dropping -in to visit
Pierre .4. Porlmann, soon to be appointed an Official Short-Wave Ob-

server for

RADIO NEB's.

You would

raft of verifrcation cards, from
countries, grouped around a business -like DX Corner. The receiver at
the left is a National a.c., Sit'1 and
the other is a 1 -tube set he built himself. At the lower right is a power
unit for supplying both receivers.
see a

i.'°1 A,

4.1

as-

_. _.:.°'

SHORT -WAVE LISTENING POST OBSERVERS
Fabius : Texas. James Brown, Heinie John.
son, Carl Scherz. Bryan Scott. Jantes W.
Sheppard, 1411131 Steward. Overton \Nilson;
Utah. Earl Larson. Harold D. Nordeen, A. 1).
Ross : Vermont. Eddie H. Davenport, Tos. M.
Kelley. Dr. Alan E. Smith, John Eagan;
Virginia, G. I1: pion Allison, I. P. Morgan.
D. W. Parsons Gordon L. Rich. Gaines
Hughes, Jr., E L. Abers; Washington.
Glenn E. Dubbe, A. D. Golden, Charles G.
Payne, J. W. Partner; West Virginia.
Kenneth R. Boord, R. E. Sumner, Fred C.
Lowe, Jr.; Wisconsin, Willard Harden,
Walter A. Jasiorkowskf: Wyoming, L. M.
Jensen, Dr. F. C. Nacgcli, Eric Butcher

S.W. PIONEERS
Official RADIO NEWS Listening

Post Observers

ISTED below hr countries are the Official
RADIO NEWS Short- \\'ace Listening Post

Observers who are serving conscientiously in
logging stations for the DX Corner.
Argentina, J. F. Etlbrooke, Santiago E.
Roulier.
Australia, Albert E. Faull, A. H. Garth,
H. Arthur Matthews, C. N. H. Richardson,
R. H. Tucker, Harold F. Lower.
Belgium, Rene Arickx.
Bermuda, Thursten Clarke.
Brazil: W. W. Enete, Louis Rogers Gray.

British Guiana, E. S. Christiani, Jr.
British West Indies, E. G. Derrick, Edela

Rosa, N. HoodDaniel, Aubrey H. Forbes.
Canada, T. T. Atkinson, A. B. Baadsitaard,
Jack Bews, Robert Edkins, W. H. Fraser.
Fred C. Hickson, C. Holmes. John E. Moore.
Charles E. Roy, Douglas Wood, ('laude A.
Dulmage, A. Belanger, Robert B. Ham.
mersley.
Canal Zone. Bertram Baker.
Canary Islands, Manuel Davin.
Central America. R. Vt ilder Tetuan.
Chile, Jorge Izyuerdo.
China, Baron on Huene.
Colombia, J. D. Lowe. Italo Amore.
Cuba. Frank H. Kydd, Dr. Evelio Millar.
Czechoslovakia. Ferry Frfedl.
Denmark, Hans W. Prfwin, Hilbert Jensen.
Dominican Republic. Jose Perez.
Dutch East Indies, E. M. O. Godee, A. den
Brecros, J. H. A. Hardeman.
Dutch West Indies, R. J. van Ommeren.
England, N. C. Smith, H. O. Graham,
Alan Barber, Donald Burns, Leslie H. Col burn. Frederick W. Cable. C. L. Davies.
Frederick W. Gunn, R. S. Houghton, W. P.
Kentpster, R. Lawton, John J. Maling, Norman hattall, L. H. PlunkettCheckeni,an,
Harold J. Self, R. Stevens, L. C. Styles,
C. I.. \\ right. John Gordon Hampshire. J.
Douglas Buckley, C. K. McConnon, Douglas
Tbwaites, J. Rowson, A. J. Webb.
France, J. C. Meillon, Jr., Alfred Qtaaglino.

Germany, Herbert Lennartz, Theodor B.

www.americanradiohistory.com

Stark.
India, D. R. D. \\radia, A. H. Dalai, Terry
A. Advins. Harry J. Dent.
Irish Free State, Ron. C. Bradley.
Iraq. Hagop Kouyoumdjian.
Italy, A. Passini, Dr. Guglielmo Tixy.
Japan, Massall Satory. Tomonobu Masuda.
Malta. Edgar J. asnallo.
Mexico, Felipe L. Saldana, Manuel Ortiz

Gomez.
New Zealand, Dr. G. Campbell Macdiar

mid, Kenneth H. Moffatt.
Newfoundland Frank \osworthy.

Norway, Per 'torp.

Palestine, W. E. Frost.
Panama, Albert Palacio.
Peru, Ranson Masias.

Philippine

Johnny Torres.

Portugal,

Islands,

'ictorino

Jose Fernandes Patrae,

Leoncu.

Jr.

Scotland, Duncan T. Donaldson.
South Africa, Mike Kruger. A. C. l.yell.
H. Mallet-Beale. C. McCormick.
Spain, lose Ma. Maranges.
Straits Settlements, C. R. Dcvaraj.
Sweden, B. Scheierman.
Switzerland, Dr. Max Hausdorff, Ed. J.

Del.opez.
Turkey, Herman Freiss, M. Seyfeddin.
A. K. Onder.
Venezuela. Francisco Fossa Anderson.
Applications for Official Observers in do
remaining countries should be scut in inini,diately to the DX Corner.

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it

MONITORING THE AIR WAVES

NEW

This is the DX Corner of J. Nemeth, of
Bucaramanga, Colombia, who keeps his
eyes open and his ears peeled for shortwave transmissions in South America.

BOOK
MAKING A LIVING
IN RADIO

Post

can learn just what opportunity there

is for anyone with a real interest in radio as
a vocation. What jobs are there? How much

train for them?
How can you break into the game, and then
get ahead? This book tells you. It covers not
only technical jobs in radio, but also the fields of
writing, broadcasting, salesmanship, etc.
do they pay? How should you

Here at last is factual information on the whole
field of radio of the kind you have wanted. Without painting exaggerated pictures, the book tells
frankly what the field offers, what you need in
order to know whether you want to go in for radio

servicing, broadcasting, operating, engineering, or
any other branch, and how to go about it.

Are You Interested In
-how to determine whether or nut radio
your vocation
-how to choose a school
-what books to buy
-haw the operator can get a berth

-a

is really

The DX Corner
(Short Waves)

lucrative by- product profession for the operator

-business expansion and engineering careers for
the serviceman
-self- training in radio writing
-opportunities in radio engineering
-breaking into broadcasting
Then see this new hook. Interesting, up -to -date. sound
and authoritative. 220 pages, illustrated, $2.00. Sent for
10 days' examination on approval:
lust mall the coupon,
today.
McGRAW -HILL ON- APPROVAL COUPON

McGraw -Hill Book Company. Inc.,
330 W. 42nd St., New York, N. Y.
Bend me Boucles Making a I.Iring In Radio for 10
days' examination on approval. In 10 cloys I will send
$2.00. plus few rents postage. or return book postpaid.
(postage paid on orders accompanied by remittance.)
Name
Address
City and Stute

Company
(Books sent

(Continued front page 354)

meters, 6110 kc. on the air now 6 -10
or 11 p.m. E.S.T. (Ledbetter, Peachy,
Skatzes, Young. Libby.)
12R0, Rome, Italy, reported on the
air 25.4 meters, 8:15 -9 a.m.. 9.:15 -10:15
a.m.. 12 noon -1 p.m., 1:45 -2:30 p.ua.
on 31.13 meters on the air daily 2:305 p.m. on Mondays, Wednesdays and
Fridays, 6 -7:30 p.m. E.S.T. and 7:459:15 p.m. E.S.T. (Ledbetter, Partner,
Baadsgaard, Coover, Reilly, Peachy,
N. C. Smith, Hyde, Robinson Marshall, Boord, de Marco. Scheirman,
Mallet -Veale, Edbrooke, Styles, Paul.)
PDK, Kootwijk, Holland, 10420 kc.,
reported heard 2 -3:30 p.m. E.S.T.

(Flynn.)

INNitloli

iji ^rn1

R\ -12 -35
in G.B. and Cmmde enlp.)

NEW 1936

HETRO

METAL TUBES!
SUPER AUDIO AMPLIFICATION!
ROBOT TUNER! 15 -2100 METERS!

FREE Bulletin containing complete
description of this remarkable new receiver
and details of HETRO'S 7 -Day FREE TRIAL

Write for
Plan.

HETRO ELECTRICAL INDUSTRIES, Inc.
4611 Ravenswood Ave., Chicago, Ill., U.S.A.

Coble Address "HETRO" All Codes

Box

Office

China.

by ZEH BOUCK

Now you

NEWS FOR DECEMBER, 1935

HB9B, Basle, Switzerland, 7118
and 3770 kc. transmitting Mondays,
Thursdays and Fridays, 10:00 p.m. to
00:00 Malta Standard Time. (Vassallo.)
PLP, PMM, PK3BR, these Java
stations are used on 27 meters, 11000
kc. and 29 meters 10,260 kc. and 98
meters, approximately 3 megacycles,
respectively, simultaneously 8 -9:30
a.m. and 8 -9 a.m. E.S.T. The first
one is taken off the air at 9:30 a.m.
to contact Dixon as PLV. (Chambers, Baadsgaard, Ledbetter, and

Lawton.)
PMY, Bandoeng, Java, 5140 kc.,
reported heard daily 5 -9 a.m. E.S.T.
(Partner, Mallet- Veale.)
PLE, Bandoeng, Java, 15.93 meters.
reported heard Tuesdays. Thursdays
and Fridays, 16 -16:30 p.m. Malta
Standard Time. (Vassallo.)
YDA, Tandjongprick, Java. now
reported transmitting on 3040 kc.
(Craft. Lawton.)
YDB, Soerabaya, Java, reported
heard on 44.70 kc. 5 -11 a.m. E.S.T.
(Craft.)
YDE2, Solo, Java. 62.37 meters,
4810 kc., reported heard 5 -8 a.m.
E.S.T. (Craft, Lawton.)
ZCK (ZBW), 34.29 meters, 8750
kc. and 55.46 meters, 5410 kc., 250
watts, transmitting 10:30 -2:15 p.m.
and 5 -11 p.m. Honolulu Time. (Illenberger.) Observer Craft says they
are on the air transmitting 3 -6 a.m.
on Mondays and Thursdays and also
from 6 -9 a.m. Tuesdays, Wednesdays,
Fridays and Saturdays. (Craft, Dalai,
Marshall.) When writing, write to
Hongkong Broadcast
Committee,

www.americanradiohistory.com

200,

Hongkong.

JVM, Nazaki, Japan, 10740 kc., on
the air now every night 1:40-2:20
a.m. E.S.T. with Japanese news; on
again from 3:45 -4:30 a.m. E.S.T.,
once nlóre from 4:40 to 7:30 a.m.
News in English is broadcast at 3:55
a.m. E.S.T. The station relays JOAK.
(Bundlie, Craft. Ross.)
JVT and JZG on 6750 kc. and 6330
kc. respectively, will again be in use
now for the evening programs during
the winter. (Craft.)
JVH,, Nazaki, Japan, 14600 kc., has
an English news program at 12:15
a.m. E.S.T. They are on the air from
12 -1 a.in. E.S.T. (Gallagher, L. M.
Jensen, Craft, Ledbetter, Peachy,
Baadsgaard, Partner.)
JVU, Nazaki, Japan, on about 15.5
meters, is heard at 2:15 a.m. E.S.T.
then faded out and was heard again
from 3 a.nt. to 5:15 a.m. E.S.T. (Burakowski.)
VUY (VUB), Bombay, India. 9565
kc., is reported now on the air Mondays; Wednesdays, Saturdays, 1517:30 G.M.T. (Scheierman.)
ETA, Addis Ababa, Ethiopia, has
been heard on 24.69 meters, 12.15
Megacycles, at 7 p.m. E.S.T. contacting New York with press reports
about the war. (Sanders, \Vest chester.)
ICK, Libya. Africa, 9.46 megacycles sometimes using other frequencies of 5.8 megacycles and 10.24
megacycles at from 5 to 7 a.m. with
war news. (Radio Fellowship, McMenamy, Andrews.)
IQA, new Italian station believed
to be in Eritrea, 14700 kc., has been
heard transmitting music and also
talking to Buenos Aires, also oecasional war news, 4:15 pain. .E.S.T.
(Wickham, Westchester.)
IRG, Massaua, Eritrea, reported
heard on about 20 meters in early
mornings broadcasting opera and
sometimes war messages. (Smith,
Anderson.)
Rhodesia Postal authorities are
broadcasting from Salisbury on 50
meters and from Btìlawayo on 31
meters Tuesdays, 19:15 -21:15 p.m.,
(Turn to page 367)

HE LISTENS AT MALTA
Meet L.P.O. Edgar J. Vassallo, who
has contributed so very many Prie reports of wide -world short-wave recaption on the Island of Malta.,
.

RADIO NEWS FOR DECEMBER,

1935

357

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Power Output TUBE TESTER
OTHER NEW MODELS

ALL WAVE DIRECT READING SIGNAL GENERATOR. All frequencies fundamentals. stabilized
101 -30000 RC. Jacks for 400 cycle audio note.
Very accurate yet easy to operate.
Model
pl
w
e 1231 complete
with
t
atterse+ and two No. 30 tubes.
.P
Dealer net
Model' 1232 same except use I10 -60 cycle A. C.
Dealer Net.
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$266`7
v

PRECISION WITHOUT

EXTRAVAGANCE
Model 1501

$4667

DEALER NET

Model

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FREE POINT TEST SET Model 1181 -A combinethree essential units: No. 1125 Volt uhm- 1illiammeter. 1151 All Wave Oscillator.
1166 -A Free Point Auxiliary Set
Tester -units can be purchased
separately, If desired.
Dealer

bet price.

$3800

-- Model 1206
MASTER UNIT COMPLETE
Model
1206.
A complete. tip-to-date laboratory contains Nos.
1200 Volt- Ohm- Mtlllnnuneter, 1210 -A Tube 'rester.
1220 -A Free Point Tester. 1231 or 1232 All -way.
Signal Generator and No.1204 Case.
items can also be purehn=ed sei :irately
rately id complete unit built ut,
over period of time. Deo ler net price

TESTS ALL TYPES-old style, new
style, hot It metal and glass- metal -specially
constructed against obsolescence.
Bring on your trick tubes that get by
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in hunting for troubles and help you to sell
more tubes. Each tube is measured by
output test. that is. the tube is fully loaded
and does not have an opportunity to reheal for an instantaneous test. It will
definitely help you sell more tubes by finding more bad and weak ones.

THE NEW MULTI PURPOSE TUBE
TESTER MODEL 1501. Radio service
dealers have always wanted a tube tester
that would test tubes under conditions
approximating their use in a radio set.
Here it is! Model 1501 combines in one
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radio servicemen in their daily work.
Here are the ten instruments:
1. Test all type tubes (New Power Output Test)
2. Neon short test
3. Separate Diode Tests
4. Neon Paper Condenser Tests
5. Electrolytic Condenser Leakage
6. D. C. Voltmeter and Milliammeter
7. Ohmmeter
8. A. C. Voltmeter
9. Decibel Meter
10. Impedance Meter

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1

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www.americanradiohistory.com

ST R U M

N TS

RADIO NEWS FOR DECEMBER,

FRANK PARKER

BENAY
VENUTA

HELEN
MARSHALL

TEDDY
BERGMAN

Backstage
TEDDY BERGMAN, youthful comedian who has bobbed up prominently
in supporting roles every now and
then, is now starred on the CBS "Hary
and Esther" program along with Jack
Arthur and Audrey Marsh. The program
has a backstage locale and a musical
drama motif is employed. Victor Arden's
Orchestra and the Rhythm Girls round out
the cast of this half -hour Thursday feature.
LLY PONS and Nino Martini, two leading personalities of the Metropolitan
Opera Company, are stars of the new
Chesterfield series of CBS. With Andre
Kostelanetz's orchestra, the vocalists will
be heard on alternating programs, Miss
Pons appearing Wednesdays and Martini
on Saturdays. David Ross, medal -winning
Columbia announcer, has the distinction of
being engaged exclusively for the Chesterfield series.

BENAY VENUTA, blonde songstress,
and Freddie Rich, the conductor, are
co- starred in the new Penthouse Party
programs of CBS, Sundays. In addition
to Rich's orchestra and the warblings of
the fair Benay, there will be renditions by
a variety of guest artists. Miss Venuta, a
comparative newcomer to the airwaves
LILY PONS

1935

broadcasting

By Samuel Kaufman
and footlights, had a meteoric rise which
consummated in her succeeding Ethel Merman in a leading role of the Broadway
musical smash hit "Anything Goes" when
Ethel hied to Hollywood for talkie engagements.
HENRY HALL, the conductor to whose
strains the entire British Empire
dances, recently made a swift trip to the
U. S. A. to study American music conditions for the. B. B. C. Hall, who is director of music of England's radio system,
spent considerable time at the NBC and
CBS studios. We ran into him at CBS
and enjoyed a chat on his short -wave programs. He said he was astonished at the
popularity of his Empire short -wave
broadcasts in this country. He had no
idea whatsoever that his programs are
keenly followed in the U. S. A., just as
they are in British colonies. It was obvious that he was quite pleased with the
fact that he had earned a considerable
following in the U. S. A. with owners of

SAMUEL KAUFMAN
AND HENRY HALL

And, in turn, he told us
that American short -wave programs are
all -wave sets.

also gaining large British audiences, even
though it means staying up way past midnight to hear our early evening features.

KATE SMITH, billed as "radio's most
popular personality," is the star of
the new coffee program sponsored by the
Great Atlantic & Pacific Tea Company
over CBS Tuesdays, Wednesdays and
Thursdays. On the thrice -a -week feature,
Kate, besides singing, will interview various personalities in the news of the week.
Jack Miller's Orchestra supplies the musical background. Another stellar vocalist
to obtain a new CBS spot is Frank Parker.
He is featured Saturdays on "The Atlantic
Family," sponsored by the Atlantic Refining Company, in both a singing and
dramatic role. Guest stars and speakers
are slated to play an important part on
this program.

SIGMUND

ROMBERG'S Swift program has returned to NBC on a Tuesday schedule with the industrious Deems
Taylor as commentator and Helen Marshall-the program's discovery of last year
-as the leading soprano. Others in the
cast include Morton Bowe, tenor, Rise
AUDREY MARSH

RADIO NEWS FOR DECE\I BER ,

359

1935

:.
Ill

@Actions

Speak LOUDER

Than Words!
Stevens, contralto; George Britton, baritone, a choral group of twelve voices and
a large concert orchestra. Romberg added
a dignified, yet popular touch to last season's schedule and his return to the air
was warmly welcomed
by network
listeners.

The manufacturer of the famous 4- Pillar
Radio Tubes is making and delivering all
types of the new Metal Tubes as initial
equipment for 1936 receivers and for
jobbers' and dealers' replacement stock.

THE Fall season marks the return to
the air of those three inimitable
funsters -Jack Benny, Fred Allen and Phil
Baker. Not on the same program, of
course! Benny is back on his Sunday
night NBC Jell -o program while Allen is

SEEING

once again clowning on NBC Wednesday
nights for Ipana Toothpaste and Sal
Hepatica. But Phil Baker, just to be different, has swerved his microphone allegiance from Armour's meats to Gulf Gasoline.
His Sunday Gulf broadcasts are
presented over CBS. Phil steps into his
new program as a substitute feature for
the late Will Rogers whose sudden death
caused deep -felt sorrow to every radio
listener. The supporting cast of Jack
Benny has undergone some change with
Michael Bartlett the featured vocalist and

BELIEVING...

but one can't see if METAL TUBES are
even "lit ", much less tell by simple examination if they are perking properly.
This is where the good service men
plus good test equipment come in. Each
radio development makes good servicing more necessary. Raytheon's service
deals give service men a wide range of
instruments from which to choose.
Write for full details. Also get the
new Technical Tube Chart: 8th Edition
(including all metal tubes). It's free!

Johnny Green's Orchestra supplying the
musical background.

AFTER a long period of clowning for a
cigar manufacturer, Georgie Burns
and Gracie Allen have signed for a new
CBS Wednesday series in the interests of
Campbell's Tomato Juice. The silly antics
of Gracie and her constant harrassing of
Georgie before the microphone led to a
sensational rise to radio and movie stardom four years ago. Prior to that they
had a successful vaudeville record. The
pair laid claim to receiving 360.000 fan
letters in a four -day period and even a
sponsor would have to admit that that's
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RAYTHEON
TRADE-MARK

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JACK BENNY

RAYTHEON PRODUCTION CORPORATION
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RAYTHEON PRODUCTION CORPORATION
Dept. D-12, 30 East 42nd Street, New York, N. Y.
Please send 8th Edition Tube Chart
\-,1 me

íddr.>
Ci /i

www.americanradiohistory.com

360

RADIO NEWS FOR DECEMBER,

1935

THE SERVICE BENCH
tells YOU something about
say customers when you

tell them what the
RCAWorld Wide Antenna System will do
When you sell an all -wave receiver, and
when you go out on a service call, it is
good business to tell the wonderful story
of RCA Antenna Systems. These systems, designed by RCA engineers,
provide much louder signals, ending
complaints about weak foreign reception when due to an inefficient antenna.
They also greatly reduce man -made
static, including automobile interference,
and almost always cure noisy reception.
Not difficult to erect, but beyond the
skill of the average listener, so you
generally get the job. RCA Antenna
Systems are available in several forms,
complete or in kits of parts, as you prefer. Reasonably priced. Write for booklet, "Antenna Facts".
RCA Parts Division, Dept. RN
RCA Manufacturing Co.. Inc., Camden, N. J.

WHEN CHOOSING
A RADIO SCHOOL
RCA Institutes, with its reputation
firmly established by 26 years service, is an institution recognized as
an important factor in die radio

industry.
1Vhe her

QCT UAL

Conducted by Zeh Bouck, Service Editor
Another Soldering Iron Kink

elementary

radio

prin-

Resident Schools at New York and Chicago
Modern Apparatus and Laboratory
Equipment-Conveniently Located
-Day and Evening Classes
Tuition Rates $3 to $10 Weekly.

Extension courses for home study
on convenient "no obligation" plan.
Examination and technical advisory
services. Free post- graduate practical training at resident school with
modern equipment under instructing engineers.

1154

Varick Street
NEW YORK

Merchandise Mart
CHICAGO

Recognized Standard in Radio Instruction Since 1909

HOOK"---1-

F G.4
SERVICE

-OFF'

HOOK

SOLDERING_
DN
WOOD
BLOCK

SERIES
WITH ..SOCKETIRON
PERMAN-

' '

s-'

EENI®

SWITCH IN

friction and its attendant wear and tear.
Two hooks are fastened to the wall to
support the iron by its head. The lower
hook is of such a height that the handle
of the iron rests in the hole, and the upper
so spaced from the lower that the handle
is about fiveinches above the surface of
the bench. The lower hook is the "off
hook" and the upper one the "on hook ".
The hooks were made from closet clothes -

KNIFE

SWITCH!

SPRiNG

CONNECT-'
ED.

CORD

coax

PULLEY -.y O'
WEIGHT

though several other
sources of supply are obvious.
The soldering iron cord is looped under
the bench and permanently plugged into a
socket a foot or two forward from the
hole (the cord being clamped to prevent
strain on the plug). A knife switch is
mounted between the hole and the socket.
The switch prongs are bent so that it opens
and closes easily, and is held closed by a
light spring. The iron cord is run through
a pulley, with a suspended weight, the
pulley being connected to the handle of
the switch with a string.
When the iron is in the off hook, the
weight and string open the switch which
is wired in series with the socket -thus
turning off the iron. When the iron is in
hooks,

sip

PIP
rg

---- -_

-"AT

R
°ill
-

FIGURE

CIRCUIT DIAGRAMOFA SUCCESSFUL SERVICE MAN
OPPORTUNITY

DAY -DREAMING

REPEATED
EFFORT

INERTIA

Dept. RN -35

SERVICE NOTES
The Precision Apparatus Corporation of
Brooklyn, N. Y., offers an unusually in-

It is another of these soldering iron
gadgets, whose legion seems to be numberless, and the utility of which is on the
same scale. A few words will supplement
the almost self- explanatory drawing. In
essence, it is an automatic "on -off" switch
-that will save electricity, not to mention
the iron -and at the same time keeps the
iron cord from entangling with the elbow
and sundry parts on the service bench.
A hole about one inch in diameter is
drilled in the service bench close to the
wall to admit the cord. This is sanded
smooth on the forward surface to reduce

Write for Catalog.

RCA INSTITUTES, Inc.

or on the on hook, the weight is
raised and the spring closes the circuit.
The tension on the cord is just enough
to keep the wire out of the way when
working. The iron, when not in use, is
placed on the on or off hook, depending
upon how soon it will again be required.
(See Figure 1.)
use,

have spent the last few weeks
browsing around New England service shops, picking up an idea here
and there which we shall, in the course
of events. pass on to you. One of the
smartest devices we ran across was in a
modest shop just out of Springfield, Mass.,
whose proprietor, equally modest, requests
that his name be withheld. We handed
him a check then and there, and the opus
is presented in Figure 1.
WE

hanging

ciples or advanced subjects, sound
appl cations, mathematics or practical radio engineering, RCA Institutes is prepared to give you the
instruction you need.

ER VICINÇ

RESISTING
TEMPTATIONS

STUDY
CAREFUL

GRASPING

WORTHWHILE

OPPORTUNITIES

LAZINESS
EXPERIENCE

TECHNICAL KNOWLEDGE
GAINED FROM

MODERN RADIO
SERVICING"

CONTROL
OF

(PLANNING

SUCCESS

EFFORT
MODERN
iMERCHANDISING
(MODERN

SAVING
MONEY

INTERRUPTED

EFFORT

METHODS

ILllll

AMSIT1oN
111.111-1+1,1

AGGRESSIVENESS

FIGURE

LACK OF
AMDITION

RADIO NEWS FOR DECEMBER, 1935

RADIO NEWS is offering five
cash prizes of $10.00, $5.00,
$4.00, $3.00 and $2.00 this month
for photographs and descriptions of
service shops. We and our readers
are as much interested in seeing
where you work as in knowing
how you work. Elaborateness will
not be the deciding factor. Ingenuity and neatness will count the
highest.
Send in your service
bench photo. Describe your equipment and anything unusual you
have done with it in 100 words or
less. All material used will be
paid for, whether prize -winning or
Address contributions to,
not.
yours for better servicing
The Service Contest Editor.

cresting service to servicemen in the modernization of old model analyzers. The
modernized analyzer shown in Figure 3 is
-or rather was-a Jewell 199. Similar
modernizations are available for practically
all popular types at a cost from one -third
to one -half that of a new, up -to -date
analyzer. Current, voltage, capacity and
resistance scales, with adaptors for all
tubes, including metal tubes.
While air conditioning is a far more
serious undertaking than the modernization
of a receiver, or the replacement of a
shorted filter condenser, it is by no means
beyond the scope of the progressive service organization. Service folks who believe they could handle this sort of a
thing should secure the booklet published
by Frigidaire entitled "A Guide for Those
Who Contemplate Air Conditioning."
While this is primarily a consumer publication, it also provides an excellent first
step in finding out what air conditioning
is all about and the factors that govern
its practicability from the radio serviceman's point of view. (This booklet can be
secured by writing to the Technical Review, care of Radio News.
Tobe Deutschmann offers a new aid to
the serviceman in the form of their "add a- unit" steel cabinets, shown in Figure 2.
These attractive green cabinets, with
drawer -pull and cards, may be secured
free of charge with kit purchases of condensers. A clever connecting arrangement
permits them to be joined in any direction
and built up into an expanding filing cabinet for small parts, etc. For further
information see your jobber or regular
mail-order house.

Two New 'Books for the
Serviceman
The interesting diagram in Figure 4 is
(Turn to page 363)

73(ií.

New-Type ELECTRAD

CARBON VOLUME
Smooth

Quiet

CONTROL

Long -Lived

"IT'S the TOP

in replacement volume controls" is
the enthusiastic endorsement service men are
giving this new Electrad development.
A radically improved design and mechanism in which
the carbon resistance element is fused to the flat
outer rial of a sturdy Bakelite ring, over which a
special-alloy floating contact shoe gently glides in a
straight line. This results in smooth, quiet, long -lived
operation never before attained, and which actually
improves with use.
The molded Bakelite case, when mounted, extends
only % inch back-panel. New-type power -switch
(approved by underwriters) may be instantly attached
or removed by a single screw. Long, easy -to-cut
aluminum shaft saves time and trouble. All standard
and special calm,

Illustrating the complete working mechanism of the control.
showing traveling position of
contact shoe on the resistance
element.

Write Dept.
RESISTOR SPECIALISTS
Featuring:-Quiet Carbon Volume Controls,
Vitreous Resistors,

Truvolt Resistors and

Power Rheostats.

RN -72

for New Catalog

New 100 -Page VOLUME
CONTROL GUIDE
!1

you send us
FREE , if
the flap (part
175

,;:owing specification and
sistancc) torn from any
new -type Electrad Carbon
Volume Control carton,
together with your business letterhead or card.
Address Dept. RN -12.

Varick St.. New York. N.Y.

EI,EÇTRAD

s4''

EW!

Another Product
of
Webster
Chicago

4 -Stage Amplifier

for Crystal Microphone
or Phonograph

FOR general public address work and
party call systems -schools, churches,
theatres, etc. -this NEW 4 -stage Amplifier for crystal microphone or phonograph is id,:!

Sound Men!
Dealers!
HERE'S YOUR CHANCE

Many Features

with this new Webster -Chicago
unit. Get complete details -NOW

Increase Your Revenue
!

Self contained. Completely enclosed.
Field excitation for two dynamic speakers. Output 17 watts. Tapped output
transformer.
Fader control system.
Speaker and microphone connections
terminate in polarized plugs. Tubes, 1
6C6.

53,

There's

2A5's,

.3fir

Write for Bulletin

THE WEBSTER COMPANY
3826 West Lake Street
CHICAGO,

5Z3.

Only ONE Webster- Chicaço.

ILL.

It's IN!

Chicago

itie new and revised edition of "Auto lower" tmat all the ten
original specifications and ten new ores is now off the press. Convert
old generators into A. C. and D. C. generators and motors with
voltages of 0 to 900 volts, for power, light, welding. and radio
operation. Create new generators adaptable for home, automobiles.

FIGURE

or trucks. They ran be driven by fan belt, wind or water. This
book, with complete illustrations. tells you how easily and nennen.
Wally these changes can be made. Also instructions for rewinding
auto armatures.
350 definitions of electrical terms. etc.
Already
used and endorsed by thousands. Price 51.00 postpaid.
3

AUTOPOWER

Dept. A

919 S. Hoye. Ave.

Chicago

AUTO
POWER

362

RADIO NEWS FOR DECEMBER,

Demanded
by those who
insist on the
best

eYervicemen 's

PRIZE CONTEST
announcement of awards
Zeh Bouck

MALLORY

Service Editor

DRY ELECTROLYTIC

CAPACITORS

FIRST PRIZE

Satisfying the Customer

BOR RADIO AND INDUSTRIAL FIELDS

"No one stunt, or single item of policy
will build a successful service business. It
takes a lot of things in one direction -the
right direction-to do that. Here are a few
points that keep my own cash - register
O[IrNOAeLe 9A0Ie sOryIC(

MALLORY vision

discovered them
MALLORY genius
designed them
MALLORY ingenuity
produced them

JOHNNY GRINNAN
The Radio Man
MNON[ sea-M

714

IIIANRLIN AVE

FIGURE

Radio Special

Thorough Cleaning and
Testing of Tubes,
Minor Repairs and
Balancing.

The Radio Man

INDIANAPOLIS
Cable Address- Pelmal'.o

Salem, Ohio

718 Franklin Ave.
PBOIIt 563

FIGURE

tomers everywhere

P. R. MALLORY & CO.,

Per Teer

JOHNNY GRINNAN

refined them

Inc.

INDIANA

"An attractive window display and a
methodical system of doing business also
contribute to my success. My policies I
observe religiously: Never `gyp' the customer-never replace tubes or parts that
don't need replacing. Make your price
right. Avoid dropping tools in the customer's home. A piece of canvass or
leatherette, about six feet square keeps
the floor clean and protects it from
scratches- points that will be appreciated
and remembered by the lady of the house.
Keep abreast of the times-don't ever let
a customer stick you on something new
Give each customer an itemized bill of the
work completed. Don't miss an opportunity

J. F. GRINNAN
718 FRANKLIN AVE.
SALEM,OHIO

RADIO SERVICE
FIGURE

to make new business contacts. Above all.
be neat, clean and courteous, and' don't
waste your time. "-Johnny Grinnan.
Quite a catechism -but it's the real
McCoy.

"I have borrowed an idea from the old
nickelodeon days in the promotion of my

inchelIne

MALLORY quality
identifies them
MALLORY integrity
guarantees them
Used by exacting cus-

the windshield sticker

A Novel Advertising Stunt

SERVICE

SECOND PRIZE

ANNUAL
INSPECTION

"Number four
in Figure 3.

tinkling: The first is a slogan hung conspicuously in my service shop -'THE CUSTOMER MUST BE SATISFIED V A satisfied customer is the best and cheapest kind
of advertising-and that sign. psychologically. is the first step towards his satisfaction.
"The second is my business card (Figure
1
of which I always carry plenty around
With me. It is a common mistake among

MALLORY experience

1935

servicemen to have too much on their cards.
White space is effective!
"Another item is my handbill shown in
Figure 2. I also have cards printed the
same size and wording. which are placed
in store windows, restaurants. auto senice
stations, barber shops. doctors' and dentists'
offices.

www.americanradiohistory.com

FIGURE 4

363

RADIO NEWS FOR DECEMBER, .1935
sales and service business. The serviceman
should experience little trouble in acquiring an old lamphouse with a slide holder
from a rural movie theater. I secured mine
as a trade -in on a new auto radio installed
in the local theater owner's car.
"Make up your own slides and project
them on a neighboring wall, or even the
sidewalk. The outfit can be readily transported for special occasions.
H. Eyler.
Mr. Eyler, with his projector and public address equipment, is shown in Figure 4.

THIRD PRIZE

A Useful Reminder
Murl E. Beauchamp hands out the little
note -books shown in Figure 5 -his adver-

airs
äAnios

MURL'S RADIO SERVICE
NOTHING TO SELL BUT
SERVICE TO EXCEL
PRONI

2090

MYYKOO[[. OKl A.

FIGURE

tisement on the attractive green cover.
These note -books are about the size of
stamp books -just right (or is it "write ")
for the vest -pocket or a lady's bag.
Mr. Beauchamp states -"Two months
ago, I spent $17.00 for 5,000 of these
books. I still have about 1,000 on hand.
The rest have been distributed, and I can
already trace $157.60 worth of business
directly to them-and they have not yet
begun to exhaust their possibilities!"

FOURTH PRIZE

Who Owns the Oldest Radio?

Fred E. Kunkel tells of an enterprising
serviceman- dealer who wanted to build up
a live mailing list of prospects for new
receivers or modernization jobs. A series
of small ads were composed offering fifty
dollars in cash prizes to the owners of
the oldest radio receivers in operation.
These ads were placed under the births
section one day, below the obituaries the
next, then on the sports page, editorial
page, comics-every place they would be
sure to find an audience. This was kept
up for a month, and from this single idea,
the names of several hu: dred folks were
obtained who thought they had the oldest
radio in town. What better prospects could
you want for a new set or modernization
jobs ?"
It is on record that practically all the
prize winners invested their cash with the
dealer who offered it
!

FIFTH PRIZE

An Experiment Worth Trying
I

"Try this one. I found it worth- while.
invested one dollar in government postK

IRKHAM 4.2131

ALL MAKES

HERBERT SELIGSON
Ítadio Technician

RNI.. +Y

IMRALN IaR.

2547 AOU29VeT Ave.

FIGURE

BROWS. N. Y.

cards. I typed my name and address on one
side, and the following on the other:
'Please call at the address below at

THIS MONTH'S
WINNERS
FIRST

PRIZE -To Johnny

Grinnan, "The Radio Man," 718
Franklin Avenue, Salem, Ohio
$10.00 for a general policy of satisfactory servicing and concrete
examples of what he is doing to
live up to it!
SECOND PRIZE-To R. H.
Eyler, Radio Service Laboratory,
Darlington, Wisconsin -$5.00 for
novelty -not to mention the faculty of keeping one's eye open for
advertising stunts!
THIRD PRIZE -To Murl E.
Beauchamp, Murl's Radio Service,
Muskogee, Oklahoma-$4.00 for
utility to the customer -and, on
the rebound, to the serviceman!
One of these reminder ideas -but
one that sticks longer than the
blotter.
FOURTH PRIZE -To Fred E.
Kunkel, 3807 Military Road, Washington, D. C.- $3.00 -again for novelty! Going to the obituary columns for a live mailing list of
new set and modernization prospects!

FIFTH PRIZE -To Herbert

Seligson, 2547 Aqueduct Avenue,
Bronx, N. Y.-Last, but by no
means least, $2.00 for a new slant
on an old idea, at the same time
saving a bit of postage!
to test all tubes in my radio. I own a
THIS DOES
model

NOT OBLIGATE ME IN ANY WAY
other than to purchase tubes if needed.
'Name
'Address
"I dropped the cards in neighboring
letter -boxes, the owners of which I was
reasonably certain had radios. "-Herbert
Seligson.

The Service Bench
(Continued from page 361)
reproduced from the front page of a 6page folder which describes "Modern Radio
Servicing", a 1300 -page book and a supplement 240 -page book entitled "Radio
Field Service Data." The first book is by
Alfred A. Ghirardi, well known author
and teacher and the second by Mr. Ghirardi and Bertram M. Freed, radio service
consultant. The diagram in radio schematic form emphasizes the need for every
serviceman to be an up -to- the -minute
technician if he expects to keep his shop
open. The folder itself gives detailed information on the contents of these new
books and explains how thoroughly they
cover the new technique of radio servicing.
Servicemen can obtain a copy of this
folder free of charge by writing to RADIO
NEWS, 461 Eighth Ave., New York City.

When Owners Meddle
"In cases of trouble, the causes of which
are not immediately apparent, it's a good
idea to ask if anyone has been playing

around with the set. I have run into several instances where a radio was apparently okay up to the speaker, and yet
absolutely dead. It looked at first like a
shot output transformer or voice -coil.
However, upon inquiry, I discovered that
the speaker plugs had been removed (in
one case by accident in the course of dusting, and in another just for fun by the
(Turn to page 384)

www.americanradiohistory.com

... for Short
or Ultra Short Wave Use
SOCKETS

The National Group of High Frequency
Sockets includes a type for nearly every
tube and purpose. At the top right above
is the JX -I00, a big wafer-type low -loss
socket for power péntorles such as the
RK -28 and RCA-803. Below it are two
fifty -watt sockets with sturdy sidewipe
contacts. Type XC -50 is entirely of lowloss Steatite; while Type XM -50 employs
the More conventional metal shell and is
Lowet in price. To the left of the fifty watters is the new Isolantite wafer- socket
for octal Metal tubes. Two sockets are
available.for the little acorn tubes. One,
for the acorn pentodes, is assembled on a
square aluminum base and has built-in
by-pass condensers for stable high -frequency operation. For the acorn triode,
the socket is of Isolantite. Both sockets
employ special constant impedance clips.
At the lower left is the old favorite. the
receiving tube socket. It is made in 4.
5, 6 and 7 prong types as vell'as a special
6 -prong coil model.
The new National General Catalog No.
250, just off the press, describes these
and many other quality components in
detail. Send for your copy.

w ww

cOVPON
T1at1onal
pllalden,

Inc.

Company,

Gentlemen:
Please
N° 250costs.
1

molting

Name
podress

loseur6

cents

lt
..

tolo9
ocover

......
.¢14.12-35

RADIO "NEWS FOR DECEMBER,

1935

RADIO PHYSICS COURSE
ALFRED A. GHIRARDI

Lesson 47.

Vector Relations

IX practical circuits in which there exists
not only capacitance but resistance
also, it is necessary not only to know
how to calculate the capacitive reactance
but also how to combine it with the resistance. The impedance in ohms of a
circuit containing a capacitance and resistance may be expressed as:
Z

orZ

=VW

2tfC

CtITERRLAB
will save you

Since capacitive reactance is 90 degrees
out of phase with the current, and resistance is in phase with the current, there is
a difference of

phase of 90 degrees between

*S4#" that noisy control. This calls for
heroic action. my good man.
Get

"CEXTRALAB," the serviceman's
friend, if you would save the goil.

Thousands of servicemen. everywhere.
know the secret of smooth, noiseless
controls
. CEXTRALAB.
For "hater than ever be.

fore"

results use CEVTR.4L.4R RADION:IIS for
replacement
.
a
small
stock ,Vices practically all
makes.

r'y Rodio Sin-or :no
yauldy,aavu,yenfehr
stive rw =s-.ee M..

Radiohms

MILWAUKEE. WIS.
Suppressors
Fixed Resistors

N
S

A T

C T O

IMPROVE
your S.W. re-

re pt ion rritll

PE.-1lí Products.
The Peak r-11 is
the only Pre-se-

lector guaranteed
Dto give
tional satisfaction to the nurot
critical S.W. listeners.

Tremendous Increase in signal strength.
Absolute
rejection of image. Increased selectivity.
Decrease
of noise level to signal ratio. Your cost $19.80.
PEAK U -6 -the last cord In design of Ultra Digit
Frequency Sumer Het receivers. Your cost $21.60.
PEAK X -4 -10 watt 5 meter x- cutler. A quality
transmitter at a price within the reach of all, non
available. Your cost $29.70.
Far further data on PEAK Products see your dealer
,r "rite to Deph. A.

EASTERN

RADIO SPECIALTY CO.

Mfrs. of PEAK PRODUCTS
New York,
1945 Broadway

them, as shown in the vector diagram at
the right of Figure 1. It is customary to
draw the line representing capacitive reactance below the resistance line as shown,
because in circuits containing both inductance and capacitance, the inductive reactance line is drawn above the resistance
line as shown in Figure 2, since the effects
of both, on the e.m.f. and current in the
circuit, are directly opposite. The impedance is represented by the hypotenuse A -C
of the triangle (to scale).
When a circuit contains inductance. capacitance and resistance, the net reactance.
X, is equal to the arithmetical difference
between the inductive reactance XL and the
capacitive reactance XC or X = XL
XC.
In any case the smaller reactance is subtracted from the larger one and the net
reactance has thé characteristics of the
larger one. Therefore the net impedance
of a circuit containing inductance, capacitance and resistance, is equal to

Z= 1/R' +X'= V/R'+

A D I O

ENGINEERING,

radio, servicing.
aviation and pollee
Morse telegcanine radio telegraphy and telephony.
Enraphy and railway accounting taught thoroughly.
gineering cousse of nine mouths' duration equivalent to
School established
three years of college radio work.
broadcasting,

All expenses lay. Catalog tree.
Dodge's Institute, Oak St., Vniparniso, Indiana
1874

actance is represented by BE and is equal
Xc. The impedance line is drawn
to XL
from the left -hand end of the resistance
line to the E point three -fourths up on
the inductive reactance.
In the diagrams such as those of Figures
1 and 2, the angle of lag between the current and the e.m.f. in the circuit is the
angle BAC formed by the impedance line
and the resistance line. Its value may be
calculated from the other known factors
in the triangle by means of trigonometry.
If the vector diagrams are drawn as shown.
and the angle comes out above the resistance line, it indicates that it is an angle
of lag, f.e., the current variations in the
circuit lag behind the e.m.f. variations by
that part of a cycle. If the angle comes
out below the resistance line as in Figure
1. it is an angle of lead, i.e., the current
variations lead those of the applied e.m.f.
It is obvious from a consideration of
Figure 2. that when the values of inductance and capacitance in a circuit happen
to be such as to make XL and Xc equal,
the difference between them is zero, making
the impedance Z equal to V R' which is
simply equal to R. Under these conditions, the circuit operates as though there
were neither inductance nor capacitance
present, the current rising and falling in
or in phase with the applied e.m.f.

A.C.

Figure 1. Vector relations of resistance,
reactance and impedance in an A.C.
circuit.

(Xc) line BD, is drawn below the resistance line AB, one fourth as great as the
inductive reactance (XL) line BC which
is drawn above the resistance line. Since
the inductive reactance predominates, the
current will lag the voltage. The net re-

or Z

=VR'+

(XL -XC)'

l
2afC/
1

2:rfL

(1S)

When a circuit contains both inductance and capacitance, the difference between the lengths of the lines representing
the inductive and capacitive reactances will
represent the result of net reactance. X.
of the circuit as shown at the right of
Figure 2. Here the capacitive reactance

www.americanradiohistory.com

SOURCE
R

INDUCTIVE
NET
).REACTANCE
,

REACTANCE

X -XL Xc

RESISTANCE

FI G.

-R

'REACTANCE
,REACTANCE
XC

Figure 2. rector relations of resistance, capacitive reactance, inductive
reactance, and impedance in an a.c.
circuit.
Referring to Figure 2, if the lines XL and
Xe were of equal length, their difference
would be zero, and the impedance line
would be identical with the resistance line.
Such a circuit is said to be in resonance or
tuned with the impressed alternating e.m.f.

A New Application of
Short-Waves
PARIS, FRANCE -The Normandie,

the
largest passenger steamship in the world,
has been equipped with a new invention
by engineers Ponte and Gutton. This invention, consisting of a short -wave equipment, causes a relay to close as soon as
the ship comes in the neighborhood of an
iceberg. In this way collisions with icebergs are to be prevented.

RADIO NEWS FOR DECEMBER,

1935

365

The DX Corner
(Broadcast Band)
(Continued from page 344)
of which are outside North America.
J. F. Edbrooke (Buenos Aires) : "The new
Argentine station LRI, 1070 kc., 50 kw. has been
testing from midnight to I a.m. daily. This station is located in Buenos Aires and its address is
Calle Rio de Janeiro 300. It is owned by the
Buenos Aires newspaper 'El Mu ndo ."
Observer McVey (Maryland): "Have re23

cently heard: IYA, 4:45.5:50 a.m.; ' \'1RC. 6
pen.; 1'Rß9. 3:25 -410 a.m.: Rennes (France) I
a.m. Rennes on 1040 kc. is at times as loud as
KNX on the next chanel."
"WKAQ, 1240
Bob Geiser (New Jersey):
kc., is ou the air every day 11-12 a.m. and 5 -9
Station
\VKAQ,
p.in. Their address is Radio
Telephone building, San Juan. l'orto Rico ?'
Observer Buitekante (New York): "The
lest time to hear KG:\ is 2.3 a.ni. They leave
the network at 2:30 EST and can then he Inggs.1
for veriticat ion purposes."

Tkeces MONEYÙs
R44i& 5ewicùt!
IF you know low to get it!
GHIRARDI TELLS YOU

in this new book

Yes, some people are sulking; stoney

Ill radio servicing today -real money!
Because they know all the latest
methods, know all the short -cut tricks
of the trade, knots' how to construct

Observer Truax (Illinois): "CKTB, the 1(s1
utter at Si. Catherines, Ontario, sends a beau tifad letter as a verification."
Observer Hunt (California) reports 'rP's

coming in hest the last hour before daylight and
can often be heard for a few minutes after sunrise. He further reports that up to Sept. 18th
the TI "a being heard on the West coast were the
saure that had been breaking through during the
summer. About the only exception was XGOA
which passed out completely during the summer.
Observer Covert (California): "KGDM lias
discontinued their midnight-6 a.m. (PST) Owl
broadcast. Finished the Trap Circuit Tenatuner
last night. I expect a lot from this unit and it
looks as though I will not be disappointed. It
appreciably removes static from ESL's and
hN X s signals. This happens to be my first attempt at Building any radio Bart but I had no
difficulty whatsoever in following the blueprints.
Does anyone know what Carolina station was
signing off at 3.50 a.m. EST on Friday morning
Sept. 6th on 1300 or 1210 kc. ?"
Observer Watson (New Zealand): "A' new
60 ksv. broadcast station is now being erected at
Titahi Bay, New Zealand and will he in operation before the end of 1936."
Observer Sheppard (New Zealand): "1 7.W.
I ZJ and I7-11 are now off the air.
Owing to a
dispute over the broadcasting rights on recordings it is Imssible that several other New Zealand
stations will lie compelled to close down. Construction on the new 10 kw. transmitter at Dunedin is proceeding rapidly. When completed it
will replie the 5(0 watt transmitter now operating on 790 kc. Other new stations soon coming
on the air are 2GR. 550 kc.; 6WA, 560 kc.;
3\\'V, 5811 kc.; 4QN, 600 kc.; 2NR, 700 kc.;
6GF. 72(7 kc.: 3G I. 830 kc.: 4P3I, 1360 kc.;
7110, 1360 Lc. and 3XY. 1421) ke." (Sonie of
these stations will probably be on the air by the
time this is read.)
Observer Mathie (New Zealand): "7N'l' is
heterodynes) hr KGC early in the evening and
later by JOBk. The lest' tiare to hear it is just
after KGl' signs off."

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The 1935 data on servicing with
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240 pages. 43

Taylor -Cockaday
"Ocean Hopper"
(Continued front page 345)
Wavelength
Frequency
Ceti
City
Meters Letters
Xe.
Country
9580 Lyndhurst, Victoria.
31.3
VK3LR
Australia
GSC
9580 Daventry, England
31.3
9570 Springfield, Mass.
31.3+ W1XK
9560 Zeesen, Germany
31.3+ DJA
9540 Zeesen, Germany
31.4+ DJN
9530 Schenectady, N. V.
31.4+ \V2XAF
9510 Melbourne. Australia
31.5+ VK3ME
9510 Daventry, England
31.5+ GSB
9501 Rio de Janeiro, Brag.
31.5+ PRFS
31.8

COH

46.2
46.5

HJSABD

44.6+ TIEP
48.7+
48.9+
49.0+
49.0+
49.1+
49.1+
49.1+
49.4+
49.7+
49.8

49.9+
49.9+
50.3+
51.2+

HJIABB
YV3RC
COCD
\V2XE
VE9HX

\V3XAL
W9XF
('RCX
\V8XAL
IIP513

DJC
HJ1ABJ

XEBT

11J4ABE

YVSRMO

Havana, Cuba
6710 San Jose, Costa Rica
6490 Cali, Colombia
6447 Barranquilla. Col.
9428

6150
6130
6120
6110
6100
6100
6090
6060
6030
6020
6006
6000
5950
5850

Caracas, Venezuela
Havana. Cuba

New York, N. Y.
Halifax, N. S.
Bound Brook, N. J.
Chicago, Ill.
Toronto, Can.
Cincinnati, Ohio
Panama City, Pan.
Zeesen, Germany
Santa Mana, Col.
Mexico City, Mex.
:Medellin. Colombia
Maracaibo. Venz.

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RADIO NEWS FOR DECEMBER,

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LTHOUGH the real s.w. DX season is over, many short -wave listeners,
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In fact, many short-wave listeners will agree when we say that there were days
when not one "foreigner" was heard and entire bands would be dead. All this
has passed by and now we are back with our receivers in full swing and the
seashore and country resorts are deserted for the home-like hearth and the shortwave radio always within easy reach.

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our mind's eye we pictured the averhours at
I3age listener spending many

the dials and "running down" those
stations that a year or two ago were considered "out." The reason we are rather
optimistic about this is that the real fan
has gone carefully about the purchasing of
a real new receiver and no amount of sales
talk can hood-wink him into buying a set
without first finding out just how much
of the "talk" is true and authentic. Some
fans used to boast of throwing a piece of
wire out the window and pulling in the
world, but we often wonder just what
they called the world!
During the past few weeks we spent not
hours but days on our roof "over hauling"
our aerials and putting up several of the
latest in transmitting sky wires. As to the
efficiency of these we cannot go into detail as yet because we have not tried them
out to any extent. Our 20 -meter antenna
is directional and when we say this we
mean it in the full sense of the word. Our
poles are about 30 -feet from the roof and
put up in ship -shape fashion. Naturally
our nautical training has come in handy
both in the necessary rigging and knowing
where the countries lie that we went to
contact.
Much of this work is really a review,
as for many years we experimented with
directional receiving antennas. We are one
of those strong believers in directional antennas and find them "priceless" when you
are going out after real DX. Just what
we, in the Eastern part of the States consider DX, the boys in England or Australia may look on as locals. But we
really think that the eastern and western
listeners will agree that the most difficult
of all continents to log is Africa.
Just about when every listener had decided that all that was left on that continent to hear, now that -CNR, Rabat,
Morocco, has decamped, was the Cairo
and Leopoldville commercial phones, two
new Africans popped into view. One is
definitely on the air and the other is expected daily. The first rumors of a newcomer came when it was worded around

www.americanradiohistory.com

that the Empress and Emperor of Ethiopia
would speak from the station ETA, Addis
Ababa. Without much more than this to
go on the station was logged on 7.6 meg.
and although a portion of the program
was re- broadcast over one of our American chain networks the short -wave listener
was overjoyed to hear a great deal more
than his broadcast -band cousin.
Another newcomer will be ON4CSL.
When we first logged this station we were
informed by other listeners supposed to
be "in the know" that we had logged a
"pirate!" Finally a letter arrived from the
owner -operator, C. R. Stegall who verified
our reception of his 14 meg. transmission
and informed us that he had now closed
down but expected to be back on the air
just as soon as new equipment en route
from the States reached him. Mr. Stegall
has been in the Belgian Congo for 20 years
and when he returns to the air we will be
able to feast our ears with native music
supplied by the natives whom ON4CSL
will bring to the microphone.
Yes, New York is hearing ZHJ, Penang
on 39.3 meters although some listeners
who have not been fortunate enough to log
it, insist that this real DX station is operating on 49.34 meters. Authentic information on this station's move to a lower
band was received by the writer from four
of his most reliable correspondents all of
whom logged and had verified their 39.3
meter reports. But don't think a piece of
wire from the window to a fence will bring
in this catch even if you do live in Dxers
Paradise!
Looking over our log for the past few
weeks we have these to report.
The
French commercial phones have a three
like
sound
similar
to
the
note flute
Javanese.
France transmits simultaneously on
11.90 meg. and 15.25 meg. for Australia
and New Zealand listeners. This broadcast is preceded by the striking of a
midget "Big Ben" at 5 a.m. EST.
RNE, 12 meg. Moscow now an almost
daily visitor from 3 to 5 p.m. At 4 p.m.
(Turn to page 367)

RADIO NEWS FOR DECEMBER,

1935

The DX Corner
(Short Waves)
(Continued from page 356)

Fridays, 16 -17 p.l1. Malta
Standard Time. (Vassallo.)
KTO, Manila, Philippine Islands,
16.24 megacycles. reported heard at
a.m., 2 a.m. and at 6:30 p.nl. E.S.T.
(Gallagher.)
VPD, Suva, Fiji Islands, 13075 kc..
is heard Sunday nights sometimes 15
minutes. earlier than their schedule.
(Gallagher and Ledbetter.)
TFJ, Reykjavik, Iceland, 24.3
meters, 12235 kc., reported heard 3
and 4 p.m. E.S.T. (Westchester.)
Listen for the Thursday Morning
Club. an amateur organization working on T meters. Paul Potter,
\V,HXP, of Los Angeles, is master
of ceremonies and has arranged to
have South, Central American, Hawaiian, Cuban and possibly Australian amateurs come in on the
chain. Here is a great chance for
DX listeners. (L. M. Jensen.)
W9XBS, Chicago. Illinois. 46.69
meters. 6425 ke.. 2.3 kw.. is heard
and on

Capt. Hall's Page
(Continued from page 366)
the Kremlin Chimes are broadcast.
HBP, 7.80 meg. Geneva. should be tuned

for when you want to know where "that
special" broadcast is being re-layed from.
OPM, 10.14 meg, Belgian Congo, is acfrom
calling Brussels.
ORG. 1021 meg. Russelede, Belgium,
can be heard around 3 a.m. but not regularly.
XBJQ. a new Mexican station insists
they are operating on 11.00 meg. but we
would be more likely to say they are on
11.60 meg. They requested reports to be
sent to P. O. Box 2825, Mexico City.
The Iceland station is on 12.235 kc. and
TFJ, is the call while TFK is for 9060
kc. The former frequency is very active.
The EAQ. Madrid announcer asks the
gullible listening public to send them one
dollar and, "we will send you one special
verification card!" Out of curiosity we
sent for it and what a shock! It is just
an ordinary white card with pale blue
letters and the hemispheres outlined in
the same color. In the left-hand corner
are pictures of three of the station's performers. The magazine that you also receive for the money is supposed to be in
English and Spanish but 99 percent of the
reading matter is in Spanish.
CEC, 10.67 meg. Santiago de Chili has
been an excellent signal every Sunday from
8.30 to 9 p.m.
VPD, 13.07 meg. Suva, Fiji Island
"takes the cake" for erratic reception.
Heard off -and -on from 12.35 to 1.30 a.m.
but mainly off.
GSL, 6.11 meg. Daventry, England has
resumed their nightly broadcasts coming
on the air at 10 p.m. just as YV2RC. also
6.1 t meg., Caracas, Venezuela. goes off.
HVJ. 15.12 meg. Vatican City is now a
regular from 10.30 to 10.45 a.m. with Eng16h transmissions on Tuesdays.
R. Siglin. Chief of the radio station in
Moscow will verify correct reports on the
Khabarovsk (RV15) station's transmissions.
Please address the "Chief" as
" Comrad" or "Madame' or "Miss" as
Comrad Siglin happens to be a lady!

"NEAT BUT NOT GAUDY"
The Listening Post of Ben Lewis, our
British friend and listener of Widnes,
Lancashire, England, who builds most
of his apparatus. It works fine, too.

Thursdays only, p.m. -6 p.m. E.S.T.
(A. E. Emerson, Millen; A. E. Smith:)
1

W4XB, Miami, Florida, 6040 kc, is
back on the air for the winter. 12
noon to 2 p.m. and 5:30 to midnight
E.S.T. (Self, A. E. Smith.)
W9XBY has been reported heard
on 195 meters. (Bundlie.)
W6XAI, a high -fidelity station on
about 1560 kc., has been reported
heard after 9 p.m. (Catching, Bundlie.)
WORK, a broadcast -band station
in York, Pa., now has a special DX
tip program Thursdays at 8 p.m.
E.S.T. (Hersowitz.)
CRCX is the new call of old
VE9GW of Bowmanville, Ont. (Craft.
Munz, A. E. Emerson, Scibal, Wood,
Williamson, Trzuskowski. Cook, Robinson. Johnson, Partner, V.D.S., Skatzes, Nevins.)
W1XAL, Boston. Mass., 6040 kc.,
is now on their winter schedule Sundays 4 -6:45 p.m. E.S.T. and Tuesdays
and Thursdays 7:30 -9 p.m. E.S.T.

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(Chambers.)
VE9BK, Vancouver, B. C., heard
12 WEEKS' SHOP TRAINING
irregularly on 4795 kc. (Craft.)
No Experience or Advanced Education Needed
TIPG, San Jose de Costa Rica.
6410 kc., on about 46 meters, reported We don't teach by book study. you get your training at
In Chicago by ACTUAL WORK on a great outlay
heard 9 -11:15 p.m. E.S.T. Observer Coyne
Radio. Broadcasting. Television. Talking Picture and
Deeter says it is TIGP and they are ofCode
equipment. And because wecutout useless theory, you
heard after 10 o'clock, still other lis- get a practical training In 12orweeks. That's why you don't
teners say 9:30 to midnight. (John- need advanced education previous experience.
son. Young, Hersowitz, Libby.)
TIGPH, Satt Jose de Costa Rica. TALKING PICTURES TELEVISION
reported heard on 51.52 meters. 5820 Talking Pictures and address systems offer great opporkc., from 7 to 12 p.m. E.S.T. (Libby.) tunities to trained men. Television is the great new branch
Radio now developing very rapidly. Be read- for your
La Voz de San Ramon, San Ramon, of
chance in Television. At Coyne you are trained on real
Costa Rica, 5500 kc., reported heard Talking Picture and Television equipment.
evenings. Does anybody know the
call? (Betances.) (Might not this be
ELECTRIC REFRIGERATION
TI5HH in San Ranson, Nicaragua on
AND AIR CONDITIONING
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Included at NO EXTRA COST
HI4D, Santo Domingo. D. R., reported heard on about 6390 kc.. 6 -8 So our graduates may have an all around training which
we arc including for a
p.m. E.S.T. (A. E. Smith, Hersowitz.) increases their earning capacity,
time a new course in Electric Refrigeration and
HRN, Tegucigalpa, Honduras, 5875 short
Air Conditioning. Here is your chance to get a practical
in
new
field
at no extra cost.
kc., reported heard Sundays 9- 11:20 training this ete,0
p.m. E.S.T. (Gleason, Hersowitz.)
TGX is the short -wave call of the
Many Earn While Learning
Guatemalan long -wave station accord-

ing to L.Y.O. Gomez. He says they WHEN YOU ENROLL AT COYNE YOU GET A LIFE
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this station? (Twomey, Johnson.)
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Paulin Street.95 -3K. Chicago. ID.
XBJQ, Mexico City, Mexico, 27.3
meters. is a new station owned by the
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H. C. LEWIS. President.
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CO9GC, Santiago de Cuba. has increased its power to 2 kw. operating I Name
4es
on 48.7 meters, 6150 kc.. daily 3:30Address.__
10:15 p.m. and Fridays 12-I a.m,
E.S.T. (Young.)
_Starr.
CO9WR, Sanctus Spiritus, Cuba, Lau
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RADIO NEWS FOR DECEMBER, 1935

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CO9JQ, Camaguey, Cuba, is now
operating on 36.72 meters, 8170 kc.,
8 -9 p.m. E.S.T. except Saturdays and

Sundays. (Singate, Johnson, Messer,
Craft, Harris, A. E. Smith, Haws, A.
Emerson, Betances, Ross, Gallagher.)
COCD, Havana, Cuba, 6130 kc.,
48.9 meters, has relayed CMCD from
9:30 until about 11:30 p.m. or midnight E.S.T.
(Johnson, Kentzel,
Cook, Gallagher, de Laet, Skatzes,
Neupert, Dickes, Stancer, Millen, A. E.
Emerson, Pasquale, Reilly, N. C.
Smith, Self Robinson, Betances, Libby,
Ross, Bundlie.)
VP3MR, Georgetown, British Guiana, 7.08 megacycles, reported heard
Sundays 7:45 -10:15 a.m., Mondays
3:45 -4:45 p.m., 6:45 -7:45 p.m., Wednesdays 6:45 -7:45 p.m., Thursdays 56:45 p.m. and Saturdays 6:45 -7:45 p.m.
E.S.T. (Munz, A. E. Emerson.)
HJSABE, Cali, Colombia, frequency
is now stated to be 21.2 meters, 14120
kc. (Libby, Scheierman.)
YV2RC, Caracas, Venezuela, has
changed frequency to 5800 kc., using
1 kw. power.
(Chambers, Deater.)
YV5RM, Maracay, Venezuela, reported heard on 7.1 megacycles, 1:30
a.m. E.S.T. (Gallagher.)
YV5AM, 40 'meters, 7105 kc., reported heard. (N. C. Smith, Ross.)
YV6RV, Valencia, Venezuela, 6520
kc. now on the air 4 -6 p.m. (Sholin,
Vassallo.)
YV8RV, Barquisimito, Venezuela,
5880 kc., reported heard.
(Sholin,
A. E. Smith.)
VY9RV, Elvalle, Venezuela, 6400
kc., is reported soon to be on the air
with 500 watts.
YV1ORSC, San Cristobal, 5720 kc.,
reported heard at about 10 p.m.
E.S.T. (Sholin, Betances, Partner.)
LSX, Buenos Aires, 10350 kc., reported active broadcasting 8 p.m.
(Twomey.)
CEC, San Diego, Chile, 10670 kc.,
4 kw., reported on the air Thursdays
and Sundays at 8:30 p.m., E.S.T.
Other listeners say Friday and Monday 8-9 p.m.; still other listeners say
every night irregularly. (Libby, deLaet, Sholin, V.D.S., Partner, Chambers, Neupert, Schradieck, A. E. Emerson, Johnson.)
OAX4D, Lima, Peru, 4780 kc., reported on the air daily 9 -I1 p.m. E.S.T.
and Thursdays and Sundays it is
11:30 p.m. E.S.T. (Sholin.)
This club has three months to go to complete its 3 -for -1 membership drive, one new
member a month for each existing member. Get busy, fellows. Let's put I.D.A.
over the top!

United States Radio DX Club
The management of this club asks a
question of its members would it like a
program devoted to DX over one of our
local broadcasting stations with short-wave
tips from its official organ, the "DX Reporter". The club invites members and
non -members to send in short -wave DX
reports for the official organ.

National Radio Club
This club is announcing a new big prize
contest for verification of special programs. Write in to the club for news.

The Globe Circlers DX Club

obligation:

TELEPLEX COMPANY
76 Cortland! Si.. New York. N.Y
MASTER TELEPLEX
Choice of Those

E.S.T.

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on about 29.3 meters, 10200 kc., has
been reported as heard as early as
6:40 p.m. and also at 8:30 -9:20 p.m.

Who

Know"

Officers of the club offer cordial greetings
and best wishes to the following new members: Carl Forestieri, John Kofron, Jr.,
A. J. Paul, Bernard Murray, Jr., Herb

www.americanradiohistory.com

Diedrich, James Richardson, Jr., and Art
Ling. This club also has a membership
drive on and offers a prize to those members bringing in the largest number.

Swiss Short -Wave Society
This society is to radiate special programs the first Monday of each month
dedicated to countrymen abroad on several
stations of the Swiss Short-Wave Society
(USKA) and over the station of the Society of Nations at Geneva at the following times: 21:10 to 22:1.5, Central European Time, or 3:10 to 4:15 p.m., Eastern
Standard Time, over the USKA stations:
HB9B, 14,236 kc.; HB9H, 7005 kc.; HB9J,
1440 kc.

The transmission will be repeated 24:0001:00, C.E.T., of the same day by HBL,
9595 kc., and HBO, 7797 kc., and over
HB9B, 14,236 kc., and HB9AT, 14,290 kc.
These programs are scheduled for the following dates: Nov. 4th, Dec. 2nd, Jan. 6
1936, Feb. 3rd.

International 6000- to 12,500 Mile Short-Wave Club
A new vice -president, Mr. Thomas F.
Tynan, is announced in place of J. H.
Miller for this organization. The club is
growing fast and many new members with
real DX records have become affiliated. .

NVVR
The NVVR (Dutch Society for Radio
Telegraphy) has now opened a new shortwave department, including a QSL Department and a QRA Department. The
club has 2000 members. QSL Bureau address is P.O. Box 800, Rotterdam. The
QRA Bureau address is Herrenstraat 26
bis, Utrect.

Society of Wireless Pioucers
Extensive arrangements are being made
by the twin city radio organization for entertaining D. R. D. Wadia, visiting America
soon from India. All British Colonial and
European members please forward news
items to Henry B. Shields, Associate Director of British Colonial and European
Affairs, 35 Bluestone Road, Monston,
Manchester, England. Mr. A. Fabius of
Honolulu, T. H., is now in charge of
Honolulu affairs and all prospective members in the territory will kindly contact
him at P.O. Box 411 for establishing a
chapter in Honolulu.

Use of the Terms S.W.
Listening Post Observer
There are a number of terms now being
commonly used in DX circles which, so far
as the editors have been able to determine,
were originated by RADIO NEWS. Among
these terms are "listening post" as applied
to radio recep'4.on, "listening post observer," "official listening post," "official listening post observer." These terms are
copyrighted by RADIO NEWS and have
been in use in this publication regularly
since 1932.

During the past year or more some of
these terms have been quite commonly
adopted by the various DX clubs. More
recently, however, newspapers and other
magazines have been following the lead
and are also making free use of these
terms. RADIO NEWS has no objection to
their use by DX or short -wave clubs and
hereby extends permission to any and all
clubs to use them freely. However, it is
suggested that commercial publications desiring to make use of these terms make
written application to the editors of RADIO
NEWS for permission.

Readers Who Are Awarded
"Honorable Mention" for Their
Work in Connection with This
Month's Short-Wave Report
E. S. Darlington, Harold J. Self, W. A. Shane,

Edgar J. Anzola, Rudolph Kure, Joe Stokes,

RADIO NEWS FOR DECEMBER,

369

1935

Checking Up on
5 -Meter DX
(Continued from page 335)
the way of practical communication was carried
out as late as Saturday, September 21st, when
during one of these tests where 5 -meter stations
were being worked under the call of W2QZ
portable from the Westchester Listening Post at
Pelham, N. Y., a contact was made with Mr.
Harry Lockwood operating a transmitter on 20
meters under the call W2HFS. Through Mr.
Lockwood's cooperation a 5 -meter contact was
maintained with the 20 -meter amateurs in the
neighborhood, duplex communication being established. A while later the 5 -meter transmitter,
working through W2HFS on 20 meters, established communication with W9BJ in St. Louis.
The 5 -meter signals being picked up byW2HFS,
about 5 miles 'away and rebroadcast quite clearly
on the 20 -meter wave to St. Louis. A 20 -meter
receiver at the Westchester Listening Post
brought W9BJ signals back and rebroadcast them
on 5 meters to W2HFS, so that al/ parties could
talk back and forth. It is quite possible that
further practical applications of 5 meter radio
telephony could be arranged, with one large station on the higher wavelengths working over
great distances and several 5 -meter stations, located at nearby points with both 5 -meter and
higher wavelength receivers. We merely point
this out as a possibility for a new kind of amateur work for future reference.

All -Wave Tuner
(Continued from page 347)
The circuit of this tuner is shown in the 'accompanying diagram and it will be noticed that
the new metal type tubes are used in all stages.
A type 6K7 tube is used in one stage of r.f. preselection, a type 6A8 as a first detector, a type
6C5 as an oscillator. two 6K7's in the two i.f.
stages and a type 6H6 as second detector and
a.v.c. tube. Both plate and grid circuits of the
i.f. inductances are tuned and the first two i.f.
amplifier coils are of the variable coupling type
which is used for maintaining high -fidelity performance. The coupling of these two coils is
controlled from a knob mounted on the front
panel. The i.f. amplifier is tuned to 470 kc.
The tuner has a wavelength range, in four
bands, from 12 to 2100 meters. The radio frequency preselector stage is employed on all bands
and it is of material assistance in reducing crosstalk interference and in minimizing noise. The
tuner is equipped with an attractive 4 -inch airplane type dial of the latest design and this dial
offers a choice of either a 40 to 1 ratio tuning action or a micro- vernier action of 125 tu 1.
The unit has its own filament transformer and
supplies the necessary filament voltages to all
tubes. When the unit is ready for installation it
is only necessary to connect the antenna and
ground leads, then connect the white wire to the
control grid of the first tube in the audio ampliR.F. COILS

565

MMFD.

RF:

6K7

The Equipment Used
'l'he Peak X4 56 -60 me. radiophone transmitter
used in these tests was operated front the Peak
X3P heavy -duty prover supply. The transmitter
uses one type 76 and three type 6A6 tubes with
an 83 rectifier connected in the circuit shown in
Figure 1. The job was completely 110 volt 60
cycle a.c. operated except for a microphone bat.
tery. The receiver used was Peak Q5 ultrahigh-frequency "superhet," using one 6C6 tube,
two 6D6 tubes, one 85 tube and one 42 output
tube. The set was used with a suitable a.c. power
supply unit. With this receiver it was found that
much better DX reception on 5 meters could be
obtained and there was no trouble from signals
being too weak to break down the characteristic
"rush" on some of the other super-regenerative
receivers that were being tested out at the sanie
time. It is the writer's opinion that the 5 -meter
ham bands offer definite possibilities for experimentation and explo!tation during the coming
year and if the amateurs will really get down
to steady work on this range, the results will
prove not only interesting but entirely worthwhile.

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fier, there is a shield over this wire and this is
the common ground lead between tuner and amplifier. Next, obtain a "B" voltage of about 150
volts from the old set or P.A. system to which it
is connected. The approximate current consumption at this voltage for all 6 tubes is 30 nm.
The operating controls shown on the front of
the panel are reading left to right: first the selectivity control; second the main tuning control;
and under this, the wave -band switch and at the
extreme right the volume control and power
switch.

Oliver Antlie, G. G. Petrie, Alex N. Chalmers,
Theodore J. La Chapelle, Jr.. Richard Zeniek,
Harts Bergner Michelangelo C. Michaelson, Bob
Gainer, Chas. 'B. Marshall, Jr., Leo Herz, J. F.
Edbrooke, Eric Butcher, Harold P. Gifmtlnr,
Caleb Wilkinson, Hugh W. Kauppila, Marshall,
J. Terry Atkinson, Earle R. Wickham, A. J.
Paul, Mrs. L. R. Ledbetter, J. Herbert Hyde,
Donald Robinson, Louis T. Haws, Carl Schradieck, Louis Alexander, Thaddeus Grabek, Gilbert W. Dixon, D. R. Wingate, Glenn beater.
Hilbert Jensen Bill Bundlie, A. D. Ross, Carl
P. Peters, E. Scala, Jr., Fred M. Craft, Walter
L. Chambers, O. P. Stancer, N. C. Smith, Edward Pohti , L. C. Styles, M. Keith Libby,
Walter F. Johnson, Arthur Evans, Manuel E.
Betances, G. W. Twomey, M.D., Edgar J. Vas sallo R. C. Messer, J. Wendell Partner, A. B.
Baadsgaard, Douglas S. Catchim, Alan E. Smith,
Sam J. Emerson Edward DeLaet, A. E. Emerson, George Illenberger, Sydney G. Miller, L. M.
Jensen, R. L. Young, Manuel Ortiz G., Boris
Scheterman, F. Crowder, Spencer E. Lawton,
Merton T. Meade, Chas. C. Moody, B. A.
Peachey, Gen. Pasquale, L. Hintzbergen O.
Hersow'itz
Edward Graf, H. Mallet -V e le,
Theodor il Stark, Walter G. Germants, W.
Howe, H. H. Parker, Howard T. Neupert, Lionel
E. Gleason, M. L. Gavin, Frank D. Andrews,
R. Lawton, Roy Sanders, Harry M. Mobridge,
F. W. Alfred A. Belanger, George Munz, Bill
Schumacher, ,joseph Johnson, John Gildea, N. C.
Smith, Dona d Graff, Fred A. Pilgrim, F. T.
Reilly, Eddie C. Lam, W. E. Frost, C. H.
Skatzes, V.D.S., Jack Cook, Robert J. Flynn,
Arthur Leutcnberg, Howard Adams, Jr., Arthur
B. Coover, Vincent Wood, Stephen Sobal, Joseph
V. Trzuskowski, J. Wilson, G. L. Harris, Dwight
Williamson, Orval Dickes, A. H. Dalai, P. H.
Rurakovski, Louis Horwath, George Charles
Sholin, Kenneth Boord, S. G. De Marco, M.D.,
Phillip R. Belt, and Harry E. Kentzel.

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RADIO NEWS FOR DECEMBER, 1935

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IALNOnS

IS indeed pleasant to hear from various parts of the country anent the progress that is being made in bettering the morale of the lowly radio technician.
Large and small locals of the ARTA with a 100 per cent enrollment seem
to be fairing better than those with memberships of a meager amount, which
is, of course; understandable. Recently, L. W. Briggs, secretary of the Utica,
N. Y., local, advised us, by hurry -up postal card. that this magazine and column
were FB and that an agreement was copped with WILY. Not so bad, what?

H, how good the miles and the grass
in the other operators' back yard
looks. Across the briny deep (yeh
poetical) comes a long drawn sigh for the
joy of being an operator under the Stars
and Stripes. We sit around these heah
parts wishing we were there in deah old
Wellington, New Zealand, from whence
cometh this strange sigh and he, by a
strange quirk of fate, gazes longingly towards these coasts also wondering and
wishing. Brother B. E. Graham -Goodger
now sitting on top or is it the bottom?)
of the world does now seem to know that
at the present time ops. are having some
tough sledding trying to get billets. Shipping has slowed down a bit in all parts
of the world but is expected to pick up
shortly. At that time there may be room
for others, but now. . . . Almost like
Mussolini in Italy replying to a like request
to an Italian American operator who married a girl in Italy, "First we must take
care of our citizens."
The photograph reproduced in our heading this month is a view of the Radio
Room of the SS Normandie. It was completely soundproofed by the De Vilbiss Co.
and should prove a boon to radio
operators.
Amongst my souvenirs we find this
epistle
. "then to my amazement found
out that there was an awful lack of manhood among broadcast men. This I think
is the real reason for the failure of these
technicians to get anywhere. There are
indeed some very FB broadcast men but
the others prevent them from making any
sacrifices to gain their much - needed better
conditions. . . . You tapped a new
thought when you mentioned the boys
who give the impression of big salaries
when they are actually struggling along on
seventy dollars per stipends.. . . There is
never a class of workers who are so continually broke as the broadcast men. Perhaps it is the association with under -paid
self- glorified announcers that helps lower
the standards of the radio profession in
In contrast is the splendid
that field.
spirit of the ship -men and I am thankful
that I had the opportunity to climb aboard
every ship that entered San Pedro harbor."
Catch on?
.

KIT- S21.00

RN -12

ORD ? ORD
CONDUCTED BY Cr1

To be an iconoclast in the business
world is highly commendable, but not, in
our opinion, practical. J. Richard Meloan,
former delegate for the ARTA in the
broadcast field on the West Coast, is now
chief instructor of the Kelsey-Jenny Radio
School in San Diego, and insists that only
by being honest with a prospective student
can one gain the confidence of said person.
Brother Meloan is absolutely correct in his
assumption that a radio instructor must be
honest, first with himself, but does not
seem to realize that proper advertisements
to explain his methods of instruction must
be presented to the embryonic op before
he can be convinced of the efficiency of
the school. St is to be hoped that Brother
Meloan's naive manner will win him many
friends and students and plenty of success in his new field.
The RCA is proposing to meet nature in
her occasional turbulent moods with the
sheer brute force of man -made radio
power. Apparatus more powerful than
any ever built for this service is being
made ready to harness kilowatts to the
task. It is expected that this xmtr, a 200 k.w. short-wave job under construction
at the company's station at Rocky Point,
Long Island, will be available for commercial use by this fall. By means of this
tremendous short -wave power, which is
five to ten times the intensity usually employed in international communication, it is
proposed to "battle the ionosphere with
kws" and over-ride certain natural obstacles which to date have limited the signal strength under abnormal conditions.
What the engineers expect to determine is
whether the hours of usefulness of one or
more of the wave bands used in long range
communication may not be lengthened and
the effects of magnetic storms minimized
The
by the use of increased power.
xmtr will work on 28 meters or in the
neighborhood of that wavelength.
A bit belated but nevertheless timely is
the story of the strike and victory of the
ARTA against the IMM lines. To those
who have not heard or read of the account
of this short but dramatic struggle for
better conditions we set forth the meat of
the whole fight. The SS Manhattan, the
newest and finest floating palace of the

RADIO NEWS FOR DECEMBER, 1935

371

IMM Line, due to sail at twelve noon,
was delayed until almost five P.M. while
negotiations were carried on between
Franklin of the IMM and Haddock of the

PRACTICAL RADIO ENGINEERING
IS THE SHORT CUT TO SUCCESS!

ARTA. Due to deadlocks the able assistance of B. Golden of the Federal Labor
Relations Board had to be brought into
the situation and a compromise was agreed
on whereupon the ship sailed but carried
a complement of five instead of the usual
three ops. Wages were adjusted and conditions were bettered. The wages were
almost up to the level which was first suggested by the ARTA and if shipping does
pick up and these wages prevail, and there
is no reason for them being lowered if
operators stick together, many broadcast
and airways ops will shoot back to the
high seas very pronto.
It is noted that a young lady, Anne
Smalley, went a' scabbing on the struck
Cities Service Toledo. The line must have
been in an awful position to have resorted
to the services of a YL whose knowledge
of radio consisted of a bit of operating and
very little of apparatus. If it is publicity
she craved, then this column confers upon
her space which could be used for much
better subject matter, but willingly presents her with it if she will only go home
and tend to her knitting, permitting men
to do a man's job. So, toodleoo, Annie,
old girl, take an old salt's advice and
never dirty the fo'c's'le when your part of
the ship is the well deck.
And now, me hearties, 'tis time for the
old bunk and sweet memories of salty
days, blue -sky nights and coffee on the
bridge with the helmsman, riding high and
falling softly with no thoughts on the
mind but the next port of call and the gal
we left behind us. More dough in our
jeans, the batteries out of the quarters
and a more pleasant "Hello" is all we want
right now and it won't be long if the
gang keeps sticking together, all- for-one
and one -for -all. And now that the festive
season begins, it is timely to suggest that
only the meat around the bone of the
turkey should be devoured and not the
bone. Bones don't turn corners, see? Also,
leave a bit of the gravy for sister or
brother, and remember that we always
have something to be thankful for if only
for the strength we have had carrying on
so ge . . . 73 . . . GY
.
.

Don't fool yourself'! The men who get
the big jobs in Radio
. work for
them! The many new improvements
that come out every [reek demnnd
that every Radioman have a keen understanding of fundamentals
in
other words
. lie must be TECHNICALLY TRAINED.
CREI honte study courses in Radio Engineering
can equip you to take advantage of
your opportunity when it cones .
you need something more than "good
intentions."

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MEN'S

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SERVICE

(Continued from page 333)
delivers 115 volts d.c. to the single section filter
consisting of filter choke L2 and 16 mfd. condensers C12 and C13. Filament current is obtained through the use of a resistor -cord -plug of
the type usual to a.c: d.c. sets. Hum is zero due
to ample filtration and no possibility of a.f. induction.
For c.w. operation, the lower right hand (second detector regeneration) control is advanced to
just beyond oscillation (indicated by the usual
'plunk' sound in the headphones), proper coils
inserted and tuned to the desired band by mean;
of the upper detector and oscillator tuning knobs,
and the first detector regeneration is adjusted by
the left hand lower knob to just below oscillation. Careful adjustment of the lower right knob
to just beyond oscillation gives selectivity such
that sinele- signal caw. reception is had in terms
of practically complete rejection of the second
beat note or audio image, for signals as strong
as R9, if the set has been tuned to yield a 1000
cycle beat note due to second detector oscillation.
1or phone reception this lower -right knob must
be adjusted below the point of oscillation. Construction is simple in the extreme
screw
driver, cutting pliers and soldering iron do the
only take an hour or two at
job, which should
most. Yet the final assembly is ship -shape and
commercial in the extreme, with all parts mounted to provide shortest possible wiring as can be
seen. Kits are available for either battery or line
operation. or either model may be obtained in
built -up forni, ready for use.

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RADIO NEWS FOR DECEMBER, 1935

312

TAYLOR-COCKAUAY

O([AN HOPPER
new receiver, which was described in
November Radio News, provides loudspeaker
reception of short wove broadcasts from
every corner of the earth. A simple single
range receiver which covers everything from
19 -49 meters; employs 9 all metal tubes in
an extremely efficient circuit.
This

We can supply the complete Foundation Kit
for this receiver as described in November
issue of Radio News which consists of Radio
News Condenser (includes C -12 j, Trimmer 8001600 mmfd., Special .0015 Mica Cond. ± 5 %,
United CS4I 30 hy. Choke, Radio News

ANT. coil # 396; Radio News B.F. Coil
=397; Radio News Osc. Coil 4398;
United Power Transformer UH4;
United Input CS2P; Drilled Cad minum Plated Ocean Hopper
Chassis; triple binding post
. Your
strip
Cost
514.95

JOBS YOURSELF
SPONSORED BY

RADIO NEWS

UPPEPPER

RADIO NEWS DX CONVERTER
We can supply complete foundation kit and all parts needed for
building this remarkable and novel
converter. See October Radio News
for complete details; then get the parts
from us. You may buy the complete kit
of parts or start with the Foundation Kit only.
Foundation Kit as described on Page 237 of
October 1935 issue of RADIO NEWS consists of the following:
set Special Radio
News DX, Converter Coils, Tuning cond. 3
gang 405 mmfd.; Hammarlund midget condenser; 4 plate 50 mmfd.; Special Padding
cond. 800 -1600 mmfd.; Mica condenser .0065
mfd.; Cadmium plated drilled chassis, with
panel welded in position; 4 tube
sockets, 3 tube shields, 2 binding S1 0.95
post strips. Your Cost
/

rWholesale Radio Service Co.

100 Sixth Avenue, Dept. NA -125
New York, N. Y.

enclose $
for which send me
the following:
Ocean Hopper complete Kit of parts
1

$14.95

"Hopper Upper" Foundation Kit

D $10.95.

Nano
Address

Litt'

State

THE TECHNICAL REVIEW
CONDUCTED BY ROBERT HERTZBERG
Measurements in Radio Engineering, by
F. E. Terman; McGraw -Hill Book Co.,
1935. Making reliable measurements at
radio frequencies has always been an unusually difficult problem. Many books on
the subject have been highly mathematical
and theoretical, leaving many a reader still
-

unable to make the required measurements.
Professor Terman has succeeded in giving
more practically useful information in his
book than is customary in similar treatises.
Yet, it is not in any sense a "popular"
book. Mathematics is used sparingly and
the text is so clear that careful students of
the contents will feel confident that they
can perform most of the described measurements.
Besides describing the methods of measurements with their respective merits, the
author also gives very valuable information on the design and construction of
laboratory apparatus such as oscillators,
multivibrators, etc. The opening chapter
deals with the measurement of voltage, current and power, first of direct current, then
of a.c. and at radio- frequencies. Right in
the beginning one learns the proper way
to connect shunts to a milliammeter so
that the switch contacts are not in the
shunt and the meter cannot burn out. It
is also shown where to put fuses so as not
to influence the accuracy of the instrument. Following chapters discuss the measurement of circuit constants first at "audio
frequencies, then at radio frequencies. Here,
for instance, one will find séveral methods
of measuring the distributed capaCity of a
coil. Continuing, the author leads one to
all sorts of measurements such as frequency, wave form and phase, vacuum
tube characteristics, a.f. amplification, receiver performance, oscillator, power amplifier and modulation measurements,
measurements on radio waves, antennas
and transmission lines. Final chapters discuss laboratory oscillators, cathode -ray
tube applications and laboratory experiments.

Practical Radio Communication, by A. R.
Nilson and J. L. Hornung; McGraw-Hill
Book Co., 1935. This is -a text book for
radio operators of all classes. It thoroughly
discusses the fundamentals of radio theory
and describes the working. construction
and operation of commercial equipment
now in use on radio stations on ships, airplanes and on land. Old radio operators
will be envious when they see the books
available for present day students. In their
time, books on radio were very scarce and
they could of course not compare with
those offered today. The author goes deeper
into the theory than has been done in
books for operators in this country. For
the first time there is an account of the
complex algebra to solve a -c networks; the
-

text contains many vector diagrams and
one occasionally encounters calculus.

www.americanradiohistory.com

There would not be sufficient room here
to enumerate all the subjects in this 750 page book. In general, it begins with the
theory of electricity and magnetism, continues with introduction to vacuum tubes,
transmitting circuit principles, receiving ch. cuit principles, antennas and wave propagation. Then follows broadcast station
equipment, communication transmitters,
radio receivers, radio aids to navigation.
The last part of the book is devoted to
power supplies; rectifier units, dynamoelectric machinery and storage batteries.
This is rather an unorthodox procedure,
but the author believes that the reader
wants to be introduced to radio at once
and does not care to wade through chapters on power supplies first.
The prospective radio operator as well
as all radio operators and many engineers
will find in this book a complete description of present day apparatus at various
types of radio stations with directions on
maintenance, adjustment and repair.
Radio Amateur

Call

Rook

Magazine.

The Fall 1935 edition of the Radio Amateur Call Book is a fat, 296-page book that
every transmitting amateur and short -wave
broadcast listener will want to have on his
operating table. It is the only thing of its
kind in print, and is absolutely indispensable to the serious listener who wants
to be able to identify the various stations
that he hears.
In addition to all American amateur stations, the book includes Thigh-frequency
commercial stations, foreign amateurs by
countries, amateur prefixes. international
abbreviations and signals, U. S. radio inspection districts, high-frequency time and
weather stations, and a lot of other incidental- information of value.

Review of Articles Appearing in
the September, 1935, Issue of the
Proceedings of the Institute of
Radio Engineers
Aircraft. Radio Equipment for Use on
European Air Lines, by A. D. Hodgson.
Description of a compact receiver-transmitter unit, of English design, intended for
small and medium size aircraft. Electrical
remote tuning is used for the receiver, and
automatic volume control on both tele-

graph and telephone signals is provided.
The whole installation weighs only 60
pounds.
Parasites and Instability in Radio Transmitters, by G. W. Eyler. This paper describes several types of parasites or
spurious oscillations and other forms of
radio transmitter instability, and discusses
methods of locating and eliminating parasitic circuits.
The Grid Coupled Dynatron, by F. Malcom Gager. A short paper dealing with an
improved oscillatory system wherein the

RADIO NEWS FOR DECEMBER,

1935

dynamic excursion is associated with the
secondary emission region of the vacuum
tube characteristic, plate current vs. plate
voltage. A more or less conventional dynatron oscillator, using a tetrode, is improved by feeding back some of the output
power to the inner grid. The maximum
increase in oscillatory power was found to
be about 50% above the same system with
a static control-grid potential.
Optimum Design of Toroidal Inductances by Grote Reber. Two fundamental
types are analyzed, and equations and
curves for condition of maximum Q and
parallel resistance are set forth. The determination of r.f. resistance, operating
conditions and possible uses are discussed.
Development of Transmitters for Frequencies Above 300 Megacycles, by N. E.
Lindenblad. Including many clear photographs and diagrams and much practical
data, this paper on ultra high- frequency
transmission is one of the best that has aped in many months. Advanced amateurs would do well to read it carefully
and study the methods and equipment used
by RCA Communications.
Some Possibilities for Low Loss Coils, by
Frederick Emmons Terman. Professor
Terman, whose books on radio and communication are achieving world renown,
discloses that a toroidal coil wound with a
flat conductor, so curved that the flat side
follows exactly the surface of the toroid,
has remarkably low losses. He discusses
the practical difficulties of realizing the
theoretical possibilities and shows that the
mechanical construction must have a perfection comparable to the skin depth of
current penetration.
Dissipation in Phase- Compensating .Vet soorks, by A. T. Starr. The effects of dissipation in the lattice -type, phase -compensating network are considered, and several methods are suggested for avoiding
such troubles as attenuation and variation
of the image impedance.

373
cient, noise-f ree reception on both broadcast and
short waves 6y means of a simple doublet type
antenna. using coupling devices at the antenna
proper and at the radio receiver.
An Analysis of Coupled Tuned Circuits at
Radio Frequencies, by L. A. Kelley. Proceedings
of the Radio Club of America September, 1935.
A thorough and highly mathematical treatise on
a highly complicated subject. to be read with the
aid of a slide rule attd a lot of black coffee.

Technical Booklets Available
Yaxley Replacement Manual

The 1936 edition of the Yaxley Replacement
Manual and Service Guide is a 160 -page book
that belongs in every serviceman's tool bag. It
lists replacement volume controls for thousands
of recetvers, replacement vibrator units for automobile sets and other products. Because of its
great cost of preparation, this book is offered free
only to men actually engaged in radio servicing
work. Requests for coptes will be honored only
if they come on business letterheads indicating
that the reader is a honafide radio serviceman or
dealer.
Send requests to RADIO News, 461
Eighth Ave.. New York City.

CIRCUITS

Replacement'

Manual
SertCe Gua1e

Sound.:
EQUIPmEnT
Latest Sound Equipment

The Webster Company 16.page catalog of amplifiers, microphones and numerous accessories
for public- address work includes numerous illustrations and complete technical specifications. To
obtain a copy free of charge.- write to RADIO
News, 461 Eighth Ave., New York City.

Catalog of Condensers and Resistors
third edition of the 1935 Aerovox
which lists a very extensive line of conand resistors for all radio renuirentents.
of this publication are obtainable free
from RADIO NEWS, 461 Eighth Avenue, New
York, N. Y.

This
catalog,
densers
Copies

FREE!

is the

Complete design for 12 tested transmitter R -F section circuits and 8
modulator and speech amplifier circuits.
Outputs ranging from the smallest

to a big broadcaster.

Electrical Engineering. for August 1935, con

the 1theoretical and practical problemss settconotered in building a simple oscillator. amplifier
transmitter for amateur use.
Simple .Methods of Measuring Resistance and
The Proper Use of Rcsisto -s to Extend .Meter
Ranttts, appearing in the ioIe and August. 1935,
issues, respectively. of
he Arroyos Worker."
Two excellent articles of considerable practical
value to radio experimenters, service men and
amateurs.
A Simple 1.07c.Coat Transmitter. by W. W.
Smith. R9, September. 1935. An efficient, versa.
tile and economical rig for the newcomer in amateur radio.
R.F. .Measurement of Resistance. Reactance
and Impedance, by T. C. Maciamara.
"The
Wireless Engineer" ( London y, September, 1935.
The method described by the author consists of
injecting a voltage of the desired frequency into
the circuit to be measured, and measuring the
applied voltage and also the resultant current.
a\eo AIL Hare Noise Reducing Antenna SysService. September.
tem. by T. Lundhaltl.
1935. This system was designed to provide effi-

TRANSMITTER

Y.Y

Review of Contemporary
Literature
tains several articles pertaining to radio: The
Hawaiian Radiotelephone System by W. I. Harrington and C. W. Hansell. An account of the
ultra. shortwave telephone circuits between the
Hawaiian islands.
Ship -to -Shore Radio in Puget Sound Area by
E. It. Hansen. .\ description of radio telephone
apparatus used nn small ships for communication
with a lauclstation with relays to the telephone
network.
Recent Research in Radio Communication by
F. Hamburger. A bibliography of literature on
advances in research on Crave propagation, tele.
vision. the ,properties of antennas, and investigations of high fidelity.
A Radio Interference Measuring Instrument
by F. O. McMillan and H. G. Barnett. Description of an mstrttntent to measure the crest and
effective values of interference tield strength.
Electronics. September, 1935. This issue comes
to the reader as a pleasant surprise, for the magazine has been increased appreciably in size, u
finer grade of paper is used. the illustrations are
clearer and more striking, the format is simpler
and more attractive and the articles are longer
and more numerous than before. The overall int.
proventent seems to justify the increased price.
What's in a Circuit. by George Granter.

Not only the circuit designs, but
complete parts specifications. Listing
transformers, inductances and all
component parts. A complete handbook on transmitter design!

Latest 1935 Catalog
RADIO N;:tvs offers, through the courtesy of
the Radio Products Company. an 8 -page catalog
which lists the complete line of Dayrad precision
radio service instruments. The booklet describes
portable and counter tube- testers, a multi -range
measuring instrument, analyzers, a vibrator
tester and an all -wave signal generator. To obtain this catalog simply send in your request to
RADIO NEWS. 461 Eighth Avenue, New York City.
RADIO NEWS Booklet Offers Repeated
For the benefit of our new readers. the are
epeating below a list of valuable technical book ets and manufacturers' catalog offers, which
vere described in detail in the June. Judy,
August. September, October and November, 1935
issues.
The majority of these booklets are stil

(Turn to page 381)

A New Book for the Amateur
and the Experimenter
Every amateur and experimenter should
have a copy of the new "Radio Handbook" for his radio library. Containing
296 pages, it is packed full of valuable
practical data on short -wave receivers.
transmitters, transceivers and antenna
systems of all types. There are numerous
diagrams and illustrations and the values
of the parts and the coil specifications are
also included. Fundamentals of radio are
given and every phase of amateur activity
front learning the code to operating a one
kilowatt outfit is told very thoroughly and
capably. The charge for this fine book is
one dollar ($1.00) and any of our readers
desiring a copy can obtain same by forwarding his remittance to RADIO NEtcs,
461 Eightlt Avenue, New York City.

This valuable reference book sent
you free. Just tear out this advertisement and send with 12c in stamps to
cover mailing expenses in order to

get your free

fie-TM

further obligation.
Hurry! The supply is limited.

C
rFL=1
=-0LN

copy. There is no

STAN DARD
TRANSFORMER
CORPORATION
856 BLACKHAWK ST.. Dept. D. CHICAGO
Please send me the Standard Manual of
Transmitter Circuits. I am enclosing 12e
in stamps.
Nance

Address

City

Slate

RADIO NEWS FOR DECEMBER,

374

1935

WHAT'S NEW IN RADIO
(Continued from page 329)

a._:a;5,v

are. fellos!

Here you
Volume

VI-the

King

service Information.

features an airplane -type dial with dual ratio drive. a wavelength range from 13
to 530 meters and an 8 -inch electrodynamic
speaker. The set incorporates automatic
volume control and a tone control. The
dimensions are 21 by 1354 by 10% inches.

All the data you need

to check a job tntelll
gently and quickly for
servlNng. whether It Is
the value of a resistor.
the capacity combina-

tion of

condenser
bank. the circuit die
grant of a set using
a

All -Wave Signal Generator

metal or glass envelope tubes, the I.F
peak. alignment. collage data: it is there

-In

Volume

The new model 339 oscillator produced
by the Radio Constructors Laboratories is
direct reading, operates from either a.c.

VI_

the greatest manual ever!
Taking up where Volume V left off, Vol
ante VI completes the compilation of all
available data of assistance to the serviceman. on every type and model receiver. Volume VI also includes changes
in older models. More than 110 manufacturers in Volume VI.

can't

Did you get your

copy of Rider's

"The Cathode

Ray Tube at
Work "?
Now available

ier and more
profitable with
their assistance.

or d.c. current and has a fundamental
range from 54 to 17,000 kcs. By the use
of harmonics this range can be increased
to about 100 mc. The instrument employs
a neon tube for the audio oscillator.

at your local
jobber.

366 pages $3.20

SOHN

New Departure in Variable
Resistors

RIDER

PUBLISHER

The Electrad Company has recently introduced a supplementary control which,
when affixed to their standard control will
form a tandem unit and thereby increase

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Brush Type A Phones
meet every headphone tenuirement.
Response GO to 10,000 cycles.
Brush phones operate from ant
.
give greater
normal source
No
volume front weak signals.
Magnets to cause diaphragm chatter. Will handle excessive volume
without overloading. Specially de-

the control range. It is so constructed that
it can be easily and quickly attached to
the single unit. The model S203 shown
here' is a tapered 500,000 ohm unit which
can be applied to many circuits.

0,n

MICROPHONES

MIKE STANDS

TWEETERS

JOBBERS

Write for

FREE

HEAD PHONES

This new midget condenser is made by
the National Company for use in ultra
high -frequency circuits. A balanced -stator

circuit

man simply notes the position of the
analyzer switch and refers to the instruction chart which accompanies the instrument. There are shown the parts numbers of the condensers or chokes required
to get exactly the same filter combinations.

Send

I OP

AND

LOUD SPEAKERS

New Midget Size Oil- Filled
Condensers

SERVICEMEN
1936 Catalogue!

Hain
Replacement Parts
Covering
Amplifiers
Short Wave Parts
Parts
AcParts
Experimenters
and Kits
cessories.
BOND RADIO COMPANY
11702 Uvernots Ave., Dept. 21K. Detroit, Mich.

is possible with the new Sprague
interference analyzer to tell exactly what
condensers or chokes are needed to eliminate noise from motors, oil burners, or
other types of electrical equipment causing interference. A serviceman or dealer
can easily and quickly connect the analyzer
into the circuit of the electrical appliance
and show his customer how interference
may be eliminated by the use of the
proper filtering components. The service-

New Condensers for Ultra
Short -Wave Fans

signed cases minimize breakage.
Weight.... G ounces. Now available at the new low price . . .
only $9.00 list.
Data Sheet No. 10 gives full
headphone information and
diagrams. Free on request.
for your Copt today.

small or mechanical band -spread pointer
is geared directly to the condenser, permitting accurate logging.

For Locating Interference

Years

Complete

1'.

Directly below is a close -up of the new
tuning dial for the Tobe 7 -tube amateur
In connection with the wide
receiver.
band-spread feature of the receiver, the dial
spreads each of the 4 amateur bands
.ever a wide area. The scale shows the
limits of the different bands and indicates the c.w. and phone sections. The

FLASH!!

afford to be
without these
manuals. Make
your job eas-

1440

New Dial for Communication
Receiver

VOLUME VI. 1250 pages with
90-page Index.
a separate

You

mmfd, and the double- spaced and balanced- stator, single -spaced units in 25
mmfd. capacity.
75

model is also available, in which two stators
act upon a single rotor. The single space
condensers are available in 15, 35, 50 and

www.americanradiohistory.com

To demonstrate its unusually small size
the new Cornell -Dubilier type TF non inductive, oil -filled condenser rated at 1000
volts is shown in the photograph beside a
standard paper condenser of the same rating These new condensers are available in
capacities of .05, .1, .25 and S mfd. The

RADIO NEWS FOR DECEMBER,

1935

Farnsworth Television

dimensions are 2 inches high by 1 inch
square. They are designed for use in high-

(Continued from page 331)
regular succession of space elements and convert them into corresponding signal currents
adequate for routing over but one signal channel.
Current impulses are amplified by all electron
multiplier (E) which is an integral part of the
valve. and by vacuum tube amplifiers (F and (it
to produce signal voltages great enough to modulate a radio carrier. Mr. Brolly explained further that the connections (H and K) between the
scanning circuits and the amplifier, provide signal impulses which automatically synchronize
reproducers tuned to the transmitter.
The cathode -ray tube (M) is the heart of the
reproducer. It converts the received electric impulses into corresponding light variations and
arranges them in orderly space- sequence to reproduce the image at the transmitter. This is
done with the use of the scanning system cony
rised of the coils (N N). the associated oscillators (O -O) and the tube (M) itself. Otter
more the scanning oscillators are joined to the
signal channel as shown by 1' to make possible
automatic control front the transmitter. Mr.
Brolly points out that amplification compensates
for the inefficiencies of translation and transmission while the series of processes is completed by propagation of the signal.
It was also explained that the focussed electron image in the dissector is scanned by displacing it in its own plane by means of transverse magnetic fields which sweep the image
across a fixed aperture. thus allowing a small
area of the picture element to produce a current
in an electrical circuit, where it may be amplified and transmitted over wire lines or by radio.
A resultant field which is inclined to the axis of
the tube is obtained by the addition of a transverse magnetic field to the focussing field. Electrons starting front given points on the cathode
travel in steiral paths directed along the resultant
magnetic held and cone to foetus at a point displaced by the transverse field.
It was pointed out that the pictures at the
receiving end could be black -and- white, a fluorescent green and black or possibly other colors.
It seems that there is a public objective toward
black -and -white pictures. It is not because black and -white images are more natural, but rather
on account of the fact that the public bas learned
to accept black -and -white as natural through constant attendance at motion -picture shows. The
color of the picture through the Farnsworth
methods depends on material utilized to produce
the fluorescence of the cathode -ray tube screen.
In the Farnsworth tests. pictures with a greenish tone were obtained through the use of a zinc
orthosilicate screen. To reproduce images in
black- and-white, a combination of substances,
including calcium tungstate, is employed.
At Farnsworth's test transmitting point (for
both wire and radio), the apparatus includes his
cathode -ray "camera ", or "dissector ", an amplifier for the minute impulses and an ultra -short
wave transmitting outfit. And. as noted, the
receiver also embodies the cathode -ray tube and
its allied equipment.
Experiments have reached the stage where
home model receivers have been designed in attractive cabinets. The featured model seen at
the Philadelphia demonstration for the Rnoun
News staff has the screen end of the cathode ray tube framed neatly at eye level from a sitting posture (Figure 3). The arrangement of
the apparatus can be seen in the rear view. Figure 4. Commercial rack mountings of Farnsworth
equipment have also been designed (Figure 5).
The recent tic -ins accomplished by the Farnsworth firm with the Baird interests of England
and the Fernseh A.G. group of Germany will
eventually result in a pooling of the best features
of all three systems in a single set. The outward similarity of the new Fernsein set to the
Farnsworth home model can be noticed in the
German model shown in Figure 6. The modern
encasing enhances the appearance of the set while
doors hide the control knobs.
The "Oscillight Tube". as the receiver cathode ray tube has been named. is shown in Figure 7.
The flat, broad end is the fluorescent screen and
the electron gun is toward the end of the funnelshaped valve. In and around this cylindrical end
of the funnel is also mounted the locussing and
horizontal magnetic deflection coils and the vera

fidelity amplifiers, transceivers, aircraft receivers and transmitters.

Tube Tester with Index
Accommodating both glass and metal
type tubes, this new Radio Products Company. "Davrad" portable series 20 tube
checker includes an index system that pro-

vides complete settings for the particular
tube under test. The instrument can also
be used in servicing radio receivers, as it
has an ohmmeter range up to 40.000 ohms
and a, 400 volt d.c. voltmeter range.

A.C.-Operated Pre -Amplifier
This compact pre- amplifier is designed
to be used with crystal microphones and
the Audio Development Company, manufactures of this new unit, supplies the following specifications: gain 35 db.; fre-

quency response, within 2 db. from 3U to
10.000 cycles; input impedance, S megohms output impedance, 200 ohms; tubes
required -one type 74 and one type 84.
;

A New Instrument for the
Serviceman
The new Solar capacitor analyzer utilizing the Wien Bridge method of capacity
measurements should be a great aid to the
serviceman for detecting leaky, shorted,
open and intermittently defective condensers. The capacity range extends from
.00002 to 70.0 microfarads.

tical deflecting magnet.
One of the chief things to be ironed out in
television as Mr. Farnsworth was quoted in last
month's article. is "standardization." This, he
declared. must precede commercialization. Also,
he said, that his fine will not manufacture television equipment. but will issue non- exclusive
licenses to other companies. Philco already is
sanctioned to make Farnsworth -type receivers
while Heintz and Kaufman has permission to
stake visual transmitters. Although the Farnsworth demonstrations were warmly received by
the press. company engineers are already- at work
on improvements. Instead of the 24- frame -persecond image used at the demonstrations, a speed
of 48- frames -per -second will soon be used. although this will actually be an interlacing of
two 24's.

n&W

TUBE TESTER

RELIABILITY

AT LOW COST

MODEL

430

DEALER'S
PRICE

$18.00
A new emission type Tube Tester that tests
all metal and glass -metal tubes. Features
:

Double Grid Cap for metal and glass metal tubes. Shadow -type A.C. meter
for adjusting line voltage. Leakage and
short test. Tubes tested under load. But
four simple operations required. Handsome portable quartered oak case with
all -metal panel having silvered letters on
black background. Especially constructed
against obsolescence.
Model 430 complete with Triplett instrument having direct reading GOOD BAD scale, protected against damage.
Net Dealer's
Price
V
Model 431 -same as Model 430, except
has Readrite direct reading GOOD -BAD
meter. Dealer's Net
Price .
n 4®

$14

Readrite also manufacture all tyixs of
testers used for servicing radio sets. including : Set Testers, Tube Testers, Resistance, Continuity and Capacity Testers,
Point -to -Point Testers and inexpensive
Indicating Meters.
See your Jobber. Write for Catalogue.

MAIL COUPON

NOW

READRITE METER WORKS
Dept. RN -M, Bluffton. Ohio
-, ud me more information:
Plca

Model 430
C

Name
Address
City

Model 431

talogne

State

376

RADIO NEWS FOR DECEMBERI

Get Into

1935

a Line

Where There's
Action -Every Day
And a Payday Every
Week -You Be the Boss!

Analyzer &

Resistance
Tester

Latest

Right now while hundreds are
looking for work where there isn't
any. the radio service field can use
trained men. With the proper
training and the necessary equipment, you can enter this field

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out Extra
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and make a comfortable living. We Include with our
course this modern set analyzer and trouble shooter without any extra charge. This piece of equipment has
proved to be a valuable help to our members. Atter a
brief period of training, you can take the set analyzer
out on service calls and really compete with "old timers.'
We show you how to wire rooms for radio -install auto
sets -build and install short-wave receivers- analyze and
repair all types of radio sets -and many other profitable
lobs can be yours. Teaching you this interesting work Is
our business and we have provided ourselves with every
facility to help you learn quickly yet thoroughly. If you
possess average intelligence and the desire to make real
progress on your own merits. you will be Interested.

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wood Are., chicane. 111.
Dept RN -512, 4513
Gentlemen: Send me details of your Enrollment Plan
and information on how to learn to make real money
in radio quick.

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Address

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City

"QUIET"

. the demand of millions
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The "Ham" Shack
(Continued front page 332)
told him of the emergency," continues W4CVQ.
"All co-orated eagerly, and event off the air.
"The following were heard handling emergency

traffic: W4AWD, W4BNI, W4AFU W4BOX,
W4BAC and W4ACZ. I am sure that I have
missed lots of you fellows," W4CVQ says, "for
1 could not hear all that went on as I was busy
most of the tinte."
The account forwarded by W4COS cites the
excellent work done by Francis Wagoner,
W4AVQ, of Lakeland, working on 75 meter
'phone with W4CQJ and W4CQK, who operates
on the 160 meter band. They assembled storm
and barometric data, relaying traffic and were of
general usefulness at all times. W4AVQ had
nearly sixty hours of continuous operation. The
160 meter 'phones co-operating were W4CTS
at Tampa, W4CPG, at New Port Richey, W4JZ
and W4CWR at St. Petersburg. They continued
operating as long as they had power.
"Tuesday brought an advisory that the storm
was moving north along the Florida west coast
toward Cedar key," continues W4COS's account.
"The situation was under control from a standpoint of 'ham' radio so Ray Caubron, W4CPW,
of Ocalla, headed north toward Lake City where
he picked up W4BIN, of White Springs- transmitter, antenna, motor generator and all -and
headed north toward Cedar key, where they were
furnished battery power to operate the thirty -two
volt generator used to put W4BIN (portable) on'
the air.
.
"That night they set up at Otter Creek. Unfortunately, their frequency was the same as
W4AKI. Fortunately the storm had subsided
by the time it reached Cedar Key and no lives
were lost, but amateur radio was on the ground
and ready before the storm hit and handled connmunication until land line communication was
restored.
"James Bebille, W4TQ operating portable at
Bradintosvn, handled all the traffic out of that
district all day Wednesday and Thursday. The
western division of the Florida Power & Light
No power and plenty of
Company was out.
damage. Bebille did a good job of getting help,
materials and news to their Miami headquarters
through St. Augustine and Lakeland.
"N4AFC and N4AGR of West Palm Beach,
W4CL\V and W4CAN. of Orlando and W4AQU
of Vere Beach, W4NN, W4DOY and \V41)Ú,
of Jacksonville, and several others were doing
their part at this time.
"We could hear the C.V. boys on 3875 kilocycles doing their 'stuff' but did not follow their
operations very much so the record of their work
15 somewhat neglected in this account.
We do
know that W4AO, W4BGL, W4NF and many
others were on the job."
The time record of sonic of the Florida stations during the emergency as compiled by
W4COS includes W4COT, Alonzo Bliss. 130
hours; W4AKI, Fred Bassett, 54 hours; George
Hill who assisted Bassett, seventeen hours;
W4EB. Frank P. Ducket, fifty -four hours;
W4DER, Hill G. Higgs, twenty four hours; Dean
H. Cross, ninety -six hours; \V4CXV, Frank R.
Green, forty -two hours; W4CNA. George F.
Klein, forty -one hours; W4CFC, Edward Doll,
unknown; W4BOD, Cecil Bales, twelve hours;
W4CZX. Joseph Dumpnd, thirty hours; E. G.
Little, fifty-six hours; W4DMX, Peter Towle
(fifteen years old), thirty hours; W4ED, Floyd
Norton, thirty -one hours and C. R. Gray, a commercial operator, twenty hours.
Describing the work done by Bliss, W4COT
and Bassett. W4AKI, W4COS says: "Monday
night the wind wrecked the electric service lines
in and around Miami. Frantic calls hour after
hour failed to bring any response. No news was
obtainable from the press. Communication lines
were down. On Tuesday morning things began

www.americanradiohistory.com

SMILES FROM JAPAN

Japanese, S. Kanda, in
his radio shack, with QSL cards from
all over the world.
A 17- year -old

The American Legion storm relief
committee called upon the Miami Amateurs for
communications with the devastated area on the
to happen.

keys..

It was then that Bassett and George Hill who
has a sound truck with a portable power supply
headed south. They got on the air shortly thereafter at Tavernier Key and called Miami. Power
was furnished W4COT soon afterward and it
was then the news began to filter through.
"Wednesday morning W4AKI reported too
much time was being consumed bringing mes-

sages from Miami miles down the keys, so
the portable was knocked down and loaded on a
boat and set up again on Matecombe Key,"
W4COS continues. "W4AKI was forced to share
time with a coast guard station. They shared
time on an alternate fifteen minute basis."
Later W4AKI was ordered off the air by a
Coast Guard officer whereafter the portable station was returned to Tavernier Key and resumed
operations.
E. G. Little, a former amateur, was with
W4AKI and George Hill was the mans go- getter,
keeping the message files and chasing all over
wherever he could do the most good." continues
W4COS. During all this Bliss (W4COT) and
his helpers were doing a wonderful job; making
telephone calls to and from Red Cross Headquarters, civil authorities, military authorities,
worried relatives and friends."
Winding up his interesting account, W4COS
says, "That's the story as far as I know it. I
may have neglected sonic of the fellows, in fact,
I know I have, for it was impossible to hear and
gather all the information as we would like to

have."
This epic piece of work is only one of many
which justifies the amateur and brings home to
the public his resourcefulness and value to the
world in general in tines of emergency. Our hat
is off to those who took part in this great work.
They did a swell job.

Broadcast Interference Kink
Most amateurs sometime during their career
are troubled with broadcast interference compplaints, particularly those who operate telephone
transmitters. A wave trap will solve the problem
in all cases. However, this involves the use of
a variable condenser and coil, and some labor.
Frequently, cases of broadcast interference can
be appeased with the simple installation of a
choke coil of the radio frequency variety in
series with the antenna lead to the receiving

set- The size of course will depend on the band
in which the transmitter is operated.
Usually
a choke coil of about 2.5 millihenrys inductance
will cure the interference.
If a choke coil of this size does not eliminate
the interference, a few turns of wire wound on
a one -inch form will solve the problem- Generally
about twice the number of turns needed for a
normal wave trap will answer. However, the
writer has found stock r.f. chokes cure about 90

per rent of the cases.
This method of eliminating broadcast interference is simple and inexpensive. It has many advantages, too. There is. of course, no tuning.
and therefore it is possible for the operator to
change frequency or the band on which he desires
to overate without having to visit his neighbors
and make wave trap adiustments. The choke will
work effectively regardless of frequency used.

Calls Heard
By N. C. Smith, Forge House, High Street,
Foots Cray, Sidcup, England, on 20 meter C.W.:
W9MV, W4MR, CX1CG, \V2EDA, W1OB,

W3EXF, W4CFJ, W3DCG, LYIX W9LNK,

RADIO NEWS FOR DECEMBER,

377

1935

\\'5AXF, W3JA, W9IU, W9.1EH, W5QW,
W5CUJ, W8CAR and W4BE.
On 40 meter C.W.: W2CQU, W8ANR,
W9NSP, W8LSA, WSIVI, LU6AX W4DL)M,

WIIDU, \W3BQJ, w1JCE, w4SW, Ú140G,
ZAIE LU7AZ, LU4BH, LU3EZ, OE6OB,
WIHPT, WITS, W2FHS, W4CDE, W4DGO
and W9JL.
On 20 meter 'phone: EA7AO, WIBIC,
W9BEZ, WIAF, LA1G, W2DVU, WIKK,
\VIAIZ, W1CND WSERY, \V3BFH, W2CQV,
W4AHH, W9DXJ, W3APO. \V3MD, K4SA,
\V2CCP, W8HTF W2HFS, W3AMD, TJ3AV,
CO2HY, W2HHIf, EA8AB, \VIAAB, WIGPE,
W3XV, W2GG, W2MB. W22B, CO2WZ,
CO2RL, W2GNQQ W2EDW, WICJV, WICRH,

,-rammarlund

WICJB, W3BSH, W3BPH anal W3DLL.
By F. W. Gunn, Ox Yard, Gosfield, Essex,
England, on 20 meter 'phone: W2CLS W2OA,
W2DST, WBBFD VK2EP, W9CVN, W6BTH,
W6ITH. W6BYW'. WSBDB. W7ALP, COSYB,
X1G, WSYW, W7DAA, W4ALG WJBSY,
W9DXE, W9BIF, W5ACT, OH2NE, W2PNE,
W3BSY and SUITN.
ßy Charles R. Steegmuller, 500 Liberty Street,
Newburgh, N. Y., on 20 meter 'phone: ON4AC,
G2DV
VE5HN CTIBY,
GSVM
G5NI
ON4Ck, X1G. GN4ZA, à5ML. VPS'IN, X2AH,
EA4AO, HPIA, G2HK, CO6OM, GSAI,
HHSPA and ON4AU.
By William Bundlie, 614 North Sixth Street,
Grand Forks, N. D., foreign amateur 'phones on
20 meters: CO2SV, COSYB, TI2RC, TI3AV,
VE2BG VE2CA, VE2FI, VE3DF, VE3QS,
VESHN'. X1G, XIK and X2AH. On 75 meter
'phone: VE4GA and \'E4QV.

FOImS

XP-53

NATURAL COLOR
LOW

LOSS

SIGNAL
GREATER
STRENGTH -MORE
SELECTIVITY

RADIO NEWS takes pleasure in publishing the following schedule of code transmissions in the United States especially for
those who wish to learn the code over the
air. All one has to do is to tune in to the
proper frequency as specified at the proper
time and day and start copying the special
code transmissions for practice. A daily
schedule is given for the present month
(beginning November 1st and ending December 1st). In the first column is the time
(a.m. or p.m.); in the second column are
the symbols, E, C, M and P (where E is
used for E.S.T., C for C.S.T., M for M.S.T.
and P for P.S.T.) ; in the third column are
the call letters of the transmitters of
amateur members of the Guild and the
fourth column contains the frequencies of
transmission in all cases, except where
otherwise noted. Each CSCG transmitting
station will begin his program at stated
time by sending "CSG" 6 times, followed
by his station call repeated 3 times, slowly.
At intervals of 5 minutes, he will repeat
"CSG" 6 times and his call letters 3 times.
All who listen to CSCG programs are requested to write a card to the transmitting
station telling him how his signals come in
and, if possible, sending him copies of
transmissions.

7:00
7:00
7:00
8:00

P.
P.
P.
P.

E.
E.
C.

E.
C.
E.

WIAMH
W3AEJ

NIFNM

W7WE
NIDUZ
WBMHE
WBEEZ

56.100. 35363'
3785
MIO
3637-7274
.3638

3830
3598

W9LK1C

37.57

W3AEJ

3785
3383
3580

W2HCP

W9SFT
WBMCP

3786

TUESDAY
8:15 A.
3:30 P.
4:00 P.
6:00 P.
6:00 P.
6:30 P.
7:00 P.
7:00 P.
7:30 P.
8:00 P.
8:00 P.
8:00 P.

A.
P.

C.
C.

E.
E.

E.
C.
M.
M.

C.
C.
E.

VE3UU

W9TE

NIFNM

W8MHE
W8EEZ
W9LKK
W9HHW
\V6IQY
WBHKT
\V5CPV

\V8MCP
W7DBP

P.
P.
P.
P.
P.

E.
P.
E.
E.
C.

W5DDC
W9TE

NIFNM

7200'
7012

3510

W7WE
3637-7274
W6MHE
3830
W8EEZ
3598
W9LKK
3757
(Turn to page 379)

AND 6 PRONGS

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NAD Silver S300 Radio News 1935 12

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