RCA BTS 101A Stereo Generator Manual
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Broadcast Equipment
BTS-101A
Stereo Generator
Ml-561061A
IB-8025127
STEAM POWERED RADIO.COM
WARNIN G
VOLTAGE S THAT ARE DANGERO US TO LIFE ARE
INVOLVE D IN THE OPERATIO N OF THIS ELECTRONIC EQUIPME NT. OPERA TING PERSONN EL
MUST AT ALL TIMES OBSERVE ALL SAFETY
REGULAT IONS. DO NOT CHANGE TUBES OR
MAKE ADJUSTM ENTS INSIDE THE EQUIPME NT
WITH VOLTAGE S APPLIED. DANGERO US CONDI TIONS MAY EXIST IN CIRCUITS WITH POWER
CONTROL S IN THE OFF POSITION DUE TO
CHARGE S RETAINED BY CAPACITO RS, ETC.
ALWAYS DISCHARG E AND GROUND CIRCUITS
PRIOR TO TOUCHING THEM TO AVOID PERSONA L
INJURY OR LOSS OF LIFE.
EMERG ENCY
FIRST AID INSTRU CTIONS
similar equip m ent are urged to
Personne l engaged in the installation , operation, or maintenanc e of this equipment or
all operating personnel to be
of
ty
du
the
is
It
p,·actice.
and
theory
in
become familiar with the following rules both
life.
of
loss
le
avoidab
prevent
thereby
and
Aid
First
ergency
Em
adequate
give
to
prepared
RESCUE BREATHIN G
is
2. If he is 11ot, ope11 th8 airway by
tilting his head backwa1d.
3. If he is still not breathing, begin
rescue breathing:
You must find out if the person
has stopped breathing. If you
think he is not breathing, place
him flat on his back . Put your
ear close to his mouth and look
at his chest. If he is breathing ,
you can feel the a ir on your
cheek . You can see hi s chest
move up and down. If you do
not feel the air or see th e chest
move, he is not breathing.
Lift up his neck with one hand
and push down on his forehead
with the other . This opens the
a irway. Sometimes doing this
wi ll le t the person breathe again
by himself. If it does not, begin
rescue breathing .
Keep his head tilted ba ckward.
Pi nch his nose shut.
Put your mouth tightly over his
mouth.
Blow into his mouth once every
five seconds.
Do Not Stop Resc ue Breath ing
Until Help Comes.
1. Find out
breathing.
if
the
person
LOOSEN CLOTHING - KEEP WARM
Do this when the victim is breathing by himself or help is avai labl e.
Keep him quiet as poss ibl e and
from beco ming c h il led. Otherwise,
treat him for shoc k.
BURNS
SKIN REDDENE D: Apply ice co ld water to burned area
to prevent burn from going deeper into skin tissue.
Cover area with clean sheet or cloth to keep away ai1.
Consult a physician.
SKIN BLISTERE D OR FLESH CHARRED : Apply ice
co ld water to burned area to prevent burn from going
STEAM POWERED RADIO.COM
deeper into sk11 1 tissue. Cover area with clean shee t or
c loth to keep away air. T reat victim for shock and t ake
to ho spita I.
EXTENSIV E BURN-SKI N BROKEN: Cover area wi t h
clean sheet or cloth to keep away air. T rea t victim for
shock and take to hospital.
Broadcast Equipment
---
sr1•to-at0oc-MO•o
••••
Instructions
BTS-101A
Stereo Generator
Ml-561061A
Commercial Communications Systems Division/Front and Cooper Streets/Ca mden, New Jer sey , U.S.A. , 08102
PRINTED IN U.S. A .
DL 779 M
STEAM POWERED RADIO.COM
IB-8025127
II
SAFETY PRECAUTIONS
Thi s equi pment is designed to fully safeguard all personnel from operating
n book
hazard s. Labels on the equipmen t and caution notices in the instructio
hazards.
potential
these
out
nt
poi
clearly
so
Any module or Printed Wiring Board may have hazardous voltages exposed,
ca ution mu st be exercised.
care
Fo llow the recommen ded procedure s provided in the Instructio n Book for
and maintenan ce of the equipmen t.
Always replace the protective co ver s after servicing the equipmen t.
WARRAN TY ITEMS
stated
Particular t arts and / or equipmen t covered by warranty are specifical ly
of sale.
as such in the warran ty or contract given to the customer at the time
war T he warranty or co ntract also stipulate s the condition s under which the
ranty may be exercised.
RCA
To obtain a new replaceme nt for suc h warranty items, contact your local
Original
the
(including
sales office and please supply Product Identif ication
Serial
Invoice Numb er, Ml Number, Type Number, Model Number, and
and
Number
Stock
(including
n
entificatio
Id
rt
Pa
nt
e
Replacem
Numb er) and
if all
Descriptio n). Requests for w arran ty replaceme nts may be unduly delayed
this informatio n is not suppl ied.
EQUIPME NT LOST OR DAMAGE D IN TRANSIT
will
When delivering the equipmen t to you, the truck driver or carrier's agent
spected
in
(a)
have
you
until
present a receipt for your signatu re. Do not si gn it
s and
the container s for visible signs of damage and (b) counted the container
or if
shortage
a
If
.
papers
shipping
the
on
shown
amount
compa r ed with the
on the
made
be
effect
that
to
notation
that
insist
noted,
is
damage
of
evidence
shipping papers before you sign them.
ly for
F urther , after receiving the equipm en t, unp ac k it and inspect thorough
the
notify
ly
immediate
,
red
scove
di
is
damage
concealed damage . If concealed
report.
inspection
an
secure
and
writing,
in
n
notificatio
the
irming
f
con
carrier,
DAYS
Th is item should be unpacked and inspected for damage WITHIN 15
ication
Commun
RCA,
to
es
after receipt. R eport all shortages and damag
Systems D ivision - Camden, N ew Jersey 08102.
as the
RCA will file all claims for loss and damage o n this equipmen t so long
be
inspection report is obtained. Dispositio n of the damaged item will
fu rnished by R CA.
FIELD ENGINEE RING SERVICE
RCA F ield
engineerin g
tive or the
- Camden,
Engineerin g Service is available at current rates. Requ ests for field
service may be addressed to your RCA Broad cast Field Repre se ntaRCA Service Company , Incorpora ted - Broad cast Service Divi sion
New Jersey 08102. T elephone (609) 338-3434 .
TECH ALERT
s is
Em ergency 24 hour t elerh one consu ltation se rvi ce for t ec hnical problem
be for available. Call TECH ALERT at (609) 338-3434 . T elex messages will
-4450.
warded to the addressee upon recei pt. Western Un io n telex number is 83
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III
TABLE OF CONTENTS
Page
TECHNICAL SUMMARY
V
LIST OF EQUIPMENT
VI
RECOMMENDED TEST EQUIPMENT
VI
GENERAL DESCRIPTION
INSTALLATION
General
Mounting the Interconnect Cable
Connections to the Main Cable Connector
Stereo Generator in other Applications
Final Mounting . . .
Interface/Radiate Panel
Exciter Unit
Stereo Generator
7
ROUTINE OPERATION . . .
7
DETAILED CIRCUIT DESCRIPTION
8
FIELD MODIFICATIONS . . . . .
Power-u p to Monaural
Mono Source Selection
Rewiring Power Transformer for 240 V ac Input
2
2
2
5
6
6
7
7
11
11
11
11
ALIGNMENT PROCEDURE . . .
Test Equipment
Power Supply Check . .
Audio Stage Alignment
Audio Filter Alignment
Separat i on Adjustment
Pilot Adjustment . .
Remote Functions . . .
Final Considerations .
17
17
PARTS ORDERING INFORMATION
Replacement Parts
Emergency Part Service
18
18
18
REPLACEMEt!T PARTS . . . .
19
SUGGESTED STATION SPARES
24
11
11
12
12
14
14
15
LIST OF ILLUSTRATIONS
Figure
1A
B
2
3
Title
Front Panel Controls and Indicato r s
Rear View
Stereo Generator Block Diagram
Oscilloscope Wavefo rms
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Page
1
1
3
16
IV
LIST OF ILLUSTRATIO NS (Continued )
Title
Figure
4
5
6
7
8
9
10
11
12
13
14
15
BTS-101A Top View
PW Board Switches and Adjustments
Dual Input Pad Components Location
BTS-101A Stereo Generator Schematic
.udio Lowpass Filter Schematic
.A
Audio Lowpass Filter Components Location
53 kHz Filter Schematic
53 kHz Filter Components Location
BTS-101A Stereo Generator Components Location
Interconnecting Cable Schematic
Precision Differential Test Generator Schematic
De-emphasis Network Schematic
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Page
25
26
26
27
29
29
30
30
31
33
35
37
V
TECHNICAL SUMMARY
PERFORMANCE
Resistive 600 ohms, Balanced
Audio Input Impedance . . .
+10 dBm+ 2 dB at 400 Hz
.
Audio Input Level . . .
dB, 30-Hz to 15,000 Hz
~1
Audio Frequency Response
0.5% or less
Harmonic Distortio n . . .
or less
0.3%
n
Intermodu lation Distortio
70 dB
.
.
.
.
.
.
.
Signal to Noise Ratio
1 Hz
+
kHz
19
.
.
Pilot Carrier Stability
dB
40
.
.
.
.
.
.
.
.
Separatio n . . . .
dB
50
n)
to
modulatio
100%
(referred
on
Subcarrie r Suppressi
Crosstalk
45 dB
Without Audio Low Pass Filter . .
40 dB
.
.
.
Filter
With Audio Low Pass
e
switchabl
usec,
75
or
50
25,
0,
Constant
Pre-Emphasis Network Time
eak
peak-to-p
volts
3.5
.
.
.
.
.
Output Level
. . . . . . . . 180 ohms
Output Impendance (See Note 1)
ELECTRICAL
120 or 240 volts, single phase, 50/60 Hz
Power Line Requirements . . . .
. . . . +10%
n
Regulatio
and
Combined Line Voltage Variation
watts max.
10
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Power Consump tion. . . . . . .
MECHANICAL
Dimensions, inches (cm) (overall) :
Width
Height
Depth
Weight, pounds (kg) . .
Altitude, feet (meters)
Ambient Temperature . .
NOTE 1.
.• 19 (48.3)
1. 75 (4.4)
9 (22.9)
7. 125 (3.23)
7500 (2286) max .
. -200C to +700C (-40F to +1400F)
The BTS-101A will meet all listed performan ce specifica tions with
up to 10 feet of RG-58/U cable feeding into a load impedance of
5000 ohms or greater; and will meet all FCC rules in effect as of
date of manufactu re with up to 50 feet of RG-58/U cable.
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VI
LIST OF EQUIPMENT
BTS-101A Stereo Generator, less two Audio Lowpass Filters
Plug-in 15 kflz Lowpass Filters (two) . . . . . . . . . .
Complete set of connector plugs for the BTS-101A
Stereo Generator (required only when Interface
Panel MI-561071 and/or Interconnecting Cable
MI-561067 are not used) (optional)
Set of chassis slides for servicing (optional)
Drilling Template for mounting units (optional)
MI-561061A
MI-56106LI
I
I
MI-561069
MI-561073
3742738
RECOMMENDED TEST EQUIPMENT
Precision AC Voltmeter
H.P. 400FL or equivalent
Audio Oscillator
H.P. 200CD or equivalent
Sweep Generator
Wavetec #180 or equivalent
Precision Differential
Amplifier
See figure 14.
DC Voltmeter
Simpson 260 or equivalent
De-emphasis Network
See figure 15.
Oscilloscope
Tektronix Type 531 with Type H
plug-in or equivalent. Scope
requirements are detailed in
the Separation Adjustment
procedure.
Stereo FM Monitor
BW-85A (BW-185) fitted with external
input attenuator (SK pot connected
through a maximum of two (2) feet
of RG-58/U to the monitor's
baseband input).
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STEREO
CRIOI
-
--•TOIi
MODE
SIOI
MONO
CRl02
SEPARATION
LEFT
RIOI
OUTPUT
LEVEL
RI03
SEPARATION
RIGHT
Rl02
IIT8• IOI
A
FIOI
XFIOI
INPUTS
JIOI
COMPOSITE
STEREOPHONIC
OUTPUT
JI02
B
IK218
Figure 1.
BTS-101A External Views
GENERAL DESCRIPTION
The BTS-101A is a completely self-contained stereo generator needing no parent
Al though designed
equipment to generate the composite sterephonic signal.
specifically to operate in conjunction with the RCA BTE-115 FM Exciter, the
BTS-101A may be used in any application requ1r1ng the generation of a
high-quality stereo signal. Since it is self-contained, it may be tested and
adjusted without the need of an exciter.
A pair of program audio signals, preferably processed by the RCA BA-150 Digital
Overshoot Compensation (DOC) Processor, are applied to the input of the unit.
(See block diagram, figure 2) . These signals are routed through the rf filter
Each channel signal is then preto the internal printed wiring board.
filter. The pre-emphasis is
lowpass
audio
kHz
15
a
to
applied
emphasized and
adjustable and both the pre-emphasis and the audio lowpass filter are switch
defeatable. The two audio channels, thus processed, are applied to the analog
inputs of an electronic switch operating at 38 kHz. The 38 kHz switching signal and the 19 kHz pilot tones are both derived from a stable 3.04 MHz crystal
oscillator. The output of the electronic switch is applied to a phase-linear
The filter
lowpass filter to remove unwanted switching-signal components.
to the
application
for
peak-to-peak
volts
3.5
of
level
a
to
amplified
is
output
normal
the
to
addition
In
Exciter.
BTE-115
the
normally
equipment,
following
samples,
signal
audio
of
pair
a
delivers
BTS-101A
the
output,
signal
composite
representative of the individual audio channel modulationg signals, for application to the metering system of an affiliated BTE-115 FM Exciter. Remote mode
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2
switching connections are located at the rear connector. A momentary closure
to ground is needed to switch modes; an internal latch keeps the unit in the
selected mode.
INSTALLATION
GENERAL
This procedure covers installation of the BTS-101A Stereo Generator either in
other applications or when used with the BTE-115 Exciter in the following RCA
transmitters.
BTF-3ES1
BTF-5ES2
referred to in text as BTF 3/5
BTF-5ES1
BTF-10ES1
BTF-20ES1
referred to in text as BTF 5/10/20
This procedure can generally be applied to other FM exciters and transmitters
as well. Drilling and tapping of the required mounting holes in the cabinet
should already have been accomplished in these RCA transmitters (see BTE-115
Exciter Unit Instruction Book IB-8025256-1), and the transmitter should be
prepared for exciter installation using the instructions.
MOUNTING THE INTERCONNECT CABLE
An interconnecting cable assembly, MI-561067-4, -5, or -6 may be supplied with
This
the exciter system, and may already be installed in the transmitter.
cable interconnects the stereo generator to the BTE-115 exciter unit, and also
provides for inputs to the system.
In the BTF-5/10/20 transmitter (if not already installed), mount the interconnect cable along the inside edge of the front left hand mounting rail in the
transmitter, using flat head screws and cable ties provided with the cable as
required. The cable should be positioned so the end with the 24 pin connector
extends toward the bottom of the transmitter, and such that the two, three, or
four legs of the cable will breakout in the area where the associated units
Connect the cable to the existing transmitter wiring, and
will be mounted.
coil any excess length in the bottom of the transmitter.
For the BTF-3/5 transmitter, mount the cable as shown in figure 7 of either
the BTF-3ES1 (IB-8027593-1) or the BTF-5ES2 (IB-8027984-1) Instruction Book.
When the optional chassis slides MI-561073 are used, the same holes are used
Refer to instructions
for mounting the chassis slides and the cable ties.
provided with the chassis slides for installation details.
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3/4
METE RI N <
SAMPL E
I fl
BT E - 1 1
t------• L
INPUT
LEFT
PRE EMPHASIS
LP F
PROGRAM
(ACTIVE)
TERMINATION
IN PUT
0
PRE-EMPHASIS
GAi N
0
0
E LECTR ONI<
SINUSOIDALIZI G
OUTPUT
LOW PASS
AMPLIFIER
AMPLIFIER
IN OUT
SWIT CH
COMPOSITE
OUTPUT TO
EXCITER.
IN PUT
RIGHT
PROGRAM
PRE
TERMINATION
EMPHASIS
STEREO
L P F
OUTPUT
LEVEL
GAIN
(ACTIVE)
• R
t--------11
IN PUT
l9kHz
VECTOR
CROSSTALK
ADJUSTMENT
0
38 kHz
IN OUT
3,04 MHz
l9kHz
DIVIDER S
CLOCK
PH A SE
PILOT
STER
0/ MONO
TANK
MODE
LATCH
MODE
~PILOT
I
FREQUENCY
POWER
SUPPLY .
Pl LOT
DIVIDER
PHA SING
•
REMOTE
3K041
l• I 11,1u
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t
;i.
Stereo Generator Bloc k Di agram
5
\
CONNECTIONS TO THE MAIN CABLE CONNECTOR
The 24 pin plug on the interconnect cable provides for audio input to and
remote control of the exciter system. Connect as follows:
1.
BTF-3/5 Transmitter - Install the mating connector supplied with the
interconnect cable as item 2. Bring audio input and remote control
lines directly to this connector as follows:
Circuit
Pin Numbers
1 &2
Left Audio Input
Shield
3
Right Audio Input
4 &5
Shield
6
Remote Stereo On
16
Remote Mono On
17
Remote Common
18
If SCA Unit is to be used, do not re-assemble connector cover, as additional
wires will be added.
Operational Note: Momentarily shorting pin 16 to pin 18 causes
stereo operation. Momenarily shorting pin 17 to 18 causes monaural operation, using the left input signal as the mono source.
2.
BTF-5/10/20 Transmitter - If the transmitter is not equipped with a
24 pin plug to mate with the interconnect cable, use the connector
supplied with the interconnect cable as i tern 2.
Remove existing
connectors from cables Nos. 201 thru 204 and connect these cables to
the 24 pin plug as follows:
Cable II
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To Pin If
Black
Red
Shield
Circuit
201
1
2
No Connection
Left Audio In
202
4
5
No Connection
Right Audio In
203
10
11
No Connection
SCA 111 Audio In
204
13
14
No Connection
SCA 112 Audio In
6
Remove wires number 514, 516, and 517 from the cable harnes s that was
removed from the transm itter during the install ation of the BTE-115
excite r.
Connect these wires from 1TB6 to the 24 pin connec tor as
follows :
Wire II
From
To Pin II
514
1TB6-15
17
Remote Mono On
516
1TB6-17
16
Remote Stereo On
517
1TB6-18
18
Remote Common
Circui t
If SCA Unit is to be used, do not re-asse mble connec tor cover, as
additio nal wires will be added to this connec tor.
Operat ional Note: Momentarily shortin g 1TB6-17 to 1TB6-18 causes normal
stereo operat ion.
Momentarily shortin g 1TB6-15 to 1TB6-18 causes
monaural operat ion, using the left input signal as the mono source .
STEREO GENERATOR IN OTHER APPLICATIONS
For install ations where the stereo genera tor is not mounted adjace nt to
the
BTE-115 excite r as well as operati on remote from the transm itter, the interconnec t cable will not be utilize d. In this case, a complete set of connec tors
for the stereo genera tor may be ordered as MI-561069 and a complete set
connec tors for the BTE-115 may be ordered as MI-561068. Item 1 of connec tor of
MI-561069, which mates with J101, must be utilize d. Connect audio input kit
and
mode contro l lines to this connec tor as follow s:
Circui t
Pin Number
Left Audio Input High
Left Audio Input Low
Shield
6
3
2
Right Audio Input High
Right Audio Input Low
Shield
4
1
5
Remote Stereo On
Remote Mono On
Common
10
12
11
Operat ional Note: Momentarily shortin g pin 10 to pin 11 causes stereo
tion. Momentarily shortin g pin 12 to pin 11 causes monaural operat ion.operatching may be accomplished by a switch , pushbu tton, relay or NPN transis tor. Swi-
FINAL t-OUNTING
For system s utilizi ng an SCA genera tor, omit the remainder of this install ation
procedu re and go to the install ation instruc tions for that unit. If no SCA
is
to be used, mount the Exciter System Components as follows:
c-
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.
7
INTERFACE/RADIATE PANEL
Mount panel in place and connect the 4 pin plug and ac twist-lock connector to
the panel.
Dress associated cables to not interfere with removal of the
exciter or stereo generator for servicing.
EXCITER UNIT
Connect the umbilical cord extending from the interface panel to the 6 pin
control connector at the rear of the exciter. Connect the 10 pin plug on the
interconnect cable to the mating input connector on the exciter. Connect the
associated rf connector from the interconnect cable to the composite input on
the exciter. (If there are additional rf connectors on this cable, they will
be labeled "SCA" an should connect to the SCA INPUT on the exciter). Connect
the rf output and ac power cables to the exciter, and mount the exciter in
place.
STEREO GENERATOR
Connect the 12 pin connector on the interconnect cable to the INPUT connector
J 101 of the stereo generator, and the associated r f connector to the OUTPUT
jack J102. Plug accord into the interface panel. Mount stereo generator.
Fill unused space(s) with blank panels.
ROUTINE OPERATION
Frequent readjustment of the BTS-101A circuitry is not normally necessary.
Occasional manual or remote mode switching will be the most common operation.
The transmission mode may be switched from stereophonic to monaural (with a
preselected audio channel for the source), and back. Switching can be
accomplished by a momentary (or continuous) connection to ground, and that
connection can be accomplished by a switch, pushbutton, relay or NPN
transistor . The selected mode is indicated by the light-emitting diode stereo
or mono indicator lamp. Refer to the schematic diagram, figure 7.
The stereo pilot should be held at a level of 9%. The most convenient method
of trimming this level is the front-panel OUTPUT LEVEL control. This is a
vernier adjustment, with a few dB of range. Should the desired setting of this
control be at an extreme of its range, resetting the internal PILOT LEVEL
control R46 may be called for, or resetting the audio limiter outputs may be in
order. See Alignment Procedure. The normal output level from the BTS-101A is
3. 5 volts peak-to-peak for 100% modulation . This should occur with a 10 dBm
input level.
The SEPARATION control settings should be checked during routine proof of
performance checks. Separation tests will require that programming material be
removed from the channel under test.
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8
DETAILED CIRCUIT DESCRIPTION
Left and right audio signals are applied to the INPUTS connector J101 on the
rear of the BTS-101A.
Refer to the schematic diagram, figure 7.
The left
channel is connected to pins 3 and 6, while the right channel is connected to
pins 1 and 4.
Pins 2, 5, 8, and 11 are available to ground the shields of
these lines. The audio signals are routed to the printed wiring board through
rf filters composed of L101, L102, L103, and L104 operating in conjuncti on with
capacitor s C101, C102, C103, and C104. Following the rf filtering , the signals
are applied to the input pads and transform ers T102 and T103.
The left channel input transform er is terminate d by R5, in parallel with R6,
R7, and RS. The range of the LEFT GAIN control R7 is restricte d by R6 and RS.
The output from R7 is applied to R9, which, with C1, forms an on-board rf
filter.
The output of this filter is then amplified by U1. Capacitor C4 is
placed in the negative feedback loop of U1 to cause a very slight but
predictab le phase lag at 15 kHz.
The output of amplifier U1 is fed into a
phase correctio n network comprised of R12, R13, and C6, to allow low audio
frequency square wave transmiss ion. Capacitor C5 is added to this network to
compensat e for a slight high-freq uency loss at 15 kHz in the audio lowpass
filters.
The signal is then fed to amplifier U2 which functions as an active
pre-emph asis network.
The pre-emph asis time-cons tant is determine d essential ly by the sum of R15 and
R16 operating in conjuncti on with capacitor (s) C12 and C13.
A flat frequency
response is obtained by switching out both C12 and C13. A 50µs time-cons tant
is obtained by switching in C13 only; 75µs is obtined by also switching in C12.
In either case, LEFT PRE-EMPIIASIS control R15 is adjusted for the correct
frequency response.
The output of U2 is applied to the 15 kHz audio lowpass filter FL 1 via series
terminati ng resistor R18. The filter output, terminate d by R20 is applied to
buffer U3 (to drive the electroni c switch for stereo generatio n) and to U7 (to
drive the metering system in the BTE-115 FM Exciter).
C14 limits the audio
noise bandwidth to 60 kHz when the audio lowpass filter is switched out.
The right audio channel functions in a manner similar to the left except that
various adjustmen ts have been added to enable precise audio channel phase and
amplitude tracking to easily allow linear crosstalk cancellat ion.
Specifically, 150 Hz control R28 allows the individua l audio channels to be adjusted
to an identical value at low frequenci es.
When the pre-emph asis is switched
out, 15 kHz (FLAT) control C24 should be adjusted for audio channel phase
tracking at 15 kHz. When the pre-empha ses is switched in, 1500 Hz control R37
enables the right pre-emph asis time-cons tant to be trimmed to agree with that
obtained in the left channel. Phase agreement at 15 kHz is enabled by 15 kHz
control R35.
The output of U4 is applied to the
15 kHz audio lowpass filter FL2 for the
right channel through series terminati ng resistor R40. Filter output is terminated by R42 and -is applied to buffer U6 ( to drive the electroni c switch for
the stereo generatio n process), and to U8 (to provide an audio sample for the
affiliate d BTE-115 Exciter metering system).
C35 limits the audio noise
bandwidth to 60 kHz when the audio lowpass filter is switched out.
STEAM POWERED RADIO.COM
9
The outputs of U3 and U6 are applied to the electronic switch U9 through de
blocking capacitors C18, C19, C39, and C40.
Diodes CR5 and CR6 prevent the
blocking capacitors from becoming reverse-biased by power on and power off
transients. The transmission of the left signal from pin 3 to pin 2 of the
electronic switch is controlled by the switching signal applied to pin 1. A 38
kHz square wave from U15 is applied to this pin, resulting in a left channel
signal, switched on and off at a 38 kHz rate, being present at pin 2. Likewise, the right channel signal is transmitted from pin 6 to pin 7, controlled
by a 38 kHz square wave applied to pin 8. However, the control signal at pin 8
is 1800 out of phase with the control signal at pin 1. Therefore, pins 2 and 7
can be connected together and the resultant signal at the combined point will
switch from left to right at a 38 kHz rate.
The output of the electronic
switch is applied to summing amplifier U10 through resistors R57 and R58.
Capacitor C22 limits the maximum slow rate from the electronic switch to less
than 50 volts per microsecond, thereby insuring that transient intermodulation
distortion products will not be generated in the summing amplifier. Separationcorrection signals from LEFT SEPARATION control R101 through R59 and RIGHT
SEPARATION control R102 through R44 are also applied to the summing amplifier.
The pilot signal is derived from a 3.04 MHz crystal oscillator formed by Q1 and
associated components.
The frequency of this oscillator is determined primarily by crystal Y1.
The signal may be trimmed to the desired frequency
(corresponding to a pilot-tone frequency of 19.0 kHz) by PILOT FREQUENCY capacitor C54.
Transistor Q2 interfaces the oscillator into the logic buffer U12B.
The output of U12B at pin 4 is a pulse at a rate of 3.04 MHz and is applied to
divider U13 for division down to 304 kHz.
The output of U13 at pin 11 is
applied to the input of U14, which divides the signal down to 76 kHz. The output of U14 at pin 9 drives the final divider U15. The outputs at U15 pins 5
and 6 are the aforementioned out of phase 38 kHz pulses which drive the
electronic switch U9. A 19 kHz signal is also supplied by divider U15 at pin
9. The 19 kHz signal is buffered by U12A and is then applied to buffers Q3 and
Q4.
The low impedance of this stage provides drive for the pilot filter consisting of L 1 and PILOT PHASE control C58. L 1 permits phasing or timing of the
pilot tone relative to the 38 kHz switching signal . The output of PILOT LEVEL
control R46, a sinusoid, is applied to the summing amplifier through R45.
GAIN of the summing amplifier U10 is determined by STEREO GAIN control R61,
The output of this stage is applied to the
whose range is limited by R60.
phase-linear 53 kHz lowpass filter FL3 through series terminating resistor R63.
The filter output is terminated primarily by R64. This filter attenuates any
signal component above 53 kHz. This results in a smoothing out of the switched
pulse left and right signal into a continuous wave.
Signal input to the output buffer amplifier U11 is determined by K1, which
selects either the mono input from pin M or the stereo signal appearing across
R64. The mono signal source is determined by the connection to pin M of either
the left channel (L) input or the right channel (R) input.
The unit is normally wired to utilize the left channel signal, but conversion in the field to
supply the right channel signal for mono transmission may be easily accomplished.
Refer to the FIELD MODIFICATIONS section, Mono Source Selection and
to fi gures 5 and 7 .
To eliminate the possibility of phase-cancellation problems in the interconnecting link between the program source and the transmitter site, only one audio channel at a time is accepted for transmission in the
mono mode.
For proper channel balance, both the L and R cables must remain
connected to their respective terminals .
STEAM POWERED RADIO.COM
10
Relay K1 is controlle d by transisto r Q5. This transisto r is part of a latching
circuit involving Q5, Q6, Q7 and Q8. This latch may be switched from one mode
to the other by operating either the front panel mode switch or by momentary
connectio n to ground of the remote control terminals , J101, pin 10 or 12.
A
transisto r or open-coll ector TTL gate may be used to accomplis h remote control
swi tching. Capacitor C60 simulates closing of S101 to the STEREO position so
that the latch will set to the STEREO mode upon each applicati on of power. I f
it is desired to power up to monaural operation , move C60 to the equivalen t
posi tion near Q7. Installin g C60 in the alternate position is described in the
FIELD MODIFICATIONS section, Power Up to Monaural. Light- emitting diodes CR10 1
and CR102 indicate the mode status on the front panel.
The power supply is of conventio nal design, with a split-prim ary power
transform er, full wave rectifica tion, and electroni c regulatio n of critical
voltages.
STEAM POWERED RADIO.COM
11
FIELD MODIFICATIONS
POWER-UP TO MONAURAL
The BTS-101A is normally shipped from the factory wired to return to the
stereophonic mode of operation at turn-on or following a power failure. Should
it be necessary to return to the monaural mode following a power failure, one
capacitor must be moved. Locate C60 (10 MF 20 volts) on the components layout
drawing, figure 5, and the BTS-101A top view, figure 4, and carefully de-solder
it from the printed wiring board. Reinstall the capacitor in the pair of holes
immediately to the left of the original location ( as viewed from the front).
The unit will now return to monaural operation following a power failure.
This change does not affect the stere-mono switching .
MONO SOURCE SELECTION
The stereo generator is normally shipped to utilize the left channel for monaural transmission. To select the right channel, unsolder the center conductor
of the shielded cable (L) from the terminal immediately in front of the monostereo selection relay K1. In its place, solder the center conductor of the
companion (R) shielded cable.
NOTE: Both Land R cables must remain
in place and connected to terminals L
and R for proper channel belance . In
case of a modification to right channel mono output, insure that the M pin
end of the unused cable does not
short.
REWIRING POWER TRANSFORMER FOR 240 V AC INPUT
The BTS-1 01A is normally wired for a primary voltage of 120 V ac . The splitprimary power transformer, T101, can have its windings connected in series for
240 V ac input, as shown on the schematic. The transformer has been designed
for either 50 or 60 Hz operation. When the transformer is reconnected for 240
V ac operation, the fuse should be changed to one with a 1/8-ampere rating.
ALIGNMENT PROCEDURE
The internal adjustments are factory sealed to prevent changes due to vibration
during shipment, and should not normally require field adjustment. This alignment procedure is provided in the event that component replacement or other
unusual conditions make realignment necessary .
TEST EQUIPMENT
The test equipment listed in the RECOMMENDED TEST EQUIPMENT l ist in the front
of this book is necessary for the alignment of the BTS-101A Stereo Generator.
It is very important that the test equipment be checked periodically for
accuracy of calibration .
STEAM POWERED RADIO.COM
12
POWER SUPPLY CHECK
1. Apply power to the stereo generator and check the de voltages at TP6 (gray)
and TP7 (white). Refer to figure 4. The voltages should be plus and minus
24 volts, _:!:10% respectively.
2. Check the voltage regulators by testing the following points ( see figure
12):
A.
B.
C.
The de voltage at U1 pin 7 should be 12 volts +5% .
The de voltage at U1 pin 4 should be -12 volts-+5%.
The de voltage at U15 pin 14 should be 5 volts +5%.
AUDIO STAGE ALIGNMENT
1.
Connect the left and right audio inputs in parallel and in phase and apply
a 2.45 volt rms audio signal at 2122 Hz (equivalent to an L=R signal of +10
dBm).
2.
Check that stereo generator is in STEREO mode (S101 to STEREO), and set the
PILOT LEVEL control to off (R46 fully counterclockwise).
3.
Set the audio amplifiers flat by switching out pre-emphasis networks
(switches S1 through S4 to left) and audio filters out (switches S5 and S6
up).
4.
Set LEFT GAIN control (R7) for an output level of O dBV (0 . 775 V rms) at
TP3 (green).
5.
Set right channel 150 Hz linear crosstalk control (R28) for a O dBV level
at TP4 (blue).
6.
Reduce oscillator level until output at TP3 equals -3 dBV (0. 548 V rms) .
Switch to left channel pre-emphasis networks (switches S1 and S2 to right)
and adjust LEFT PRE-EMPHASIS control ( R15) until output at TP3 equals 0
dBV. Switch out left pre-emphasis (switches S1 and S2 to left) and return
oscillator to original level.
7.
Switch in left channel 15 kHz audio lowpass filter FL 1 (rear filter, switch
S5 down).
Set oscillator to 19 kHz.
While monitoring TP3 with an
oscilloscope;
A.
B.
C.
D.
8.
Adjust inductor L4 for a null. See fig ure 9.
Adjust L6 for a null at 22 kHz .
Adjust L2 for a null at 30 kl-lz.
Recheck 19 and 22 kHz adjustments . Switch left channel filter out
of the circuit (switch S5 up).
Move the scope to TP4 and switch in the right 15 kHz lowpass filter FL2
(front filter, switch S6 down) . Set the oscillator to 19 kHz and;
A.
B.
Adjust inductor L4 for a null.
Adjust L6 for a null at 22 kHz,
STEAM POWERED RADIO.COM
f
13
C.
D.
9.
Adjust L2 for a null at 30 kHz.
Recheck 19 and 22 kHz adjustments.
out of the circuit (switch S6 up).
Switch the right 15 kHz filter
Disconnect the audio oscillator from the generator inputs and connect a
sweep generator in its place.
A.
Set the scope for external horizontal input and drive this input with
the control voltage output of the sweep generator. Set the sweep width of
the generator to cover the range of 200 Hz to 16 kHz, and set the sweep
rate to approximately 5 sweeps per second.
B. This step requires the use of a precision differential amplifier having
a common mode rejection ratio of approximately 80 dB.
Such an amplifier
may be constructed as shown in figure 14. Connect the inputs of the precision unity gain differential amplifier to TP3 and TP4 and connect the
differential amplifier output to the vertical input of the oscilloscope.
C. Set the scope to 1 V/cm sensitivity; feed a left only reference signal
to the sweep generator, and adjust the output level of the sweep generator
to yield a 2 volts peak-to-peak signal on the scope.
Feed an L=R signal to the stereo generator and set the scope sensitivity to
5 mV/cm.
The scope now displays amplitude and phase errors (between the two audio
channels) on the vertical axis against frequency on the horizontal axis.
Adjustments will now be made which will reduce these errors to 5 mV peak-topeak ( 1 cm peak-to-peak) which is 52 dB below the reference level. It may
be necessary to decrease the scope sensitivity at the beginning of an adjustment but the displayed error should ultimately be below 5 mV peak-topeak (1 cm peak-to-peak on 5 mV/cm setting).
Confirm that both pre-emphasis networks are switched out
through S4 to the left).
(switches S1
10 . Adjust right channel 150 Hz linear crosstalk control (R28) for minimum
amplitude on the scope during the mid and low-frequency portion of the
sweep.
Adjust 15 kHz linear crosstalk (FLAT) capacitor C24 for minimum
amplitude at the higher frequencies.
11. This step requries that the sweep generator signal be de-emphasized.
Insert a suitable de-emphasis network, such as the one shown in figure 15,
between the sweep generator and stereo generator.
Note that the deemphasis network shown is designed to work into the 300 ohm impedance presented by the parallel connection of the left and right inputs of the
stereo generator. Whenever this network is used to feed a single 600 ohm
input, that input should be paralleled with a 600 ohm resistor so that the
de-emphasis network always operates into a 300 ohm load.
Switch in the pre-emphasis networks of both audio channels ( switches S 1
through S4 to the right).
Adjust right channel 1500 Hz linear crosstalk
control (R37) for minimum amplitude at the mid-frequencies. Adjust right
channel 15 kHz linear crosstalk control (R35) for minimum amplitude at the
high frequencies .
STEAM POWERED RADIO.COM
14
12. Repeat steps 10 and 11 (de-emp hasis and pre-emp hasis out for step 10).
AUDIO FILTER ALIGNMENT
During this phase of alignme nt, the permiss ible error magnitud e will be relaxed
to . 01 volts peak-to- peak (2 cm peak-to- peak on 5 mV/cm setting ), which is 46
dB below the referenc e level. The differe ntial amplifi er, sweep oscilla tor,
and oscillos cope should remain in the same configu ration as utilized in the
previous steps.
Again, it may be necessa ry to vary the scope vertica l
sensitiv ity at the beginnin g of this adjustm ent, but the error should utimate ly
be .01 volts peak-to- peak, or less, for frequen cies below 15 kHz.
1.
Switch in both left and right channel audio lowpass filters (switche s .S5
and S6 down) and carefull y adjust each inducto r slug on FL 1 and FL2 for
m1n1mum error. This alignme nt should be accomplished by a number of small
systema tic adjustm ents working from inducto r to inducto r in a repetiti ve
cycle. No single adjustm ent will obtain the desired results , but rather, a
balance of a number of correct adjustm ents is necessa ry. The criterio n for
a correct single adjustm ent is to reduce the error single amplitud e as much
as possible while simultan eously reducing amplitud e variatio ns (ripple) in
the error signal.
Both criteria ,;ire equally importa nt and reductio n of
error amplitud e at the expense of increasi ng error ripple is to be avoided .
When this point is found, it is time to move on to another inductor for
further adjusme nt. When the audio filters are properly adjusted , the differentia l amplifie r should yield a moniton ically rising error signal with
increasi ng frequenc y. The end result should look trumpet shaped, with the
error signal not exceedin g .01 volts peak-to- peak at 15 kHz and below.
2.
Switch the left and right channel pre-emp hasis network s out (switche s S1
through S4 to left) and remove sweep de-emph asis. Confirm that the filters
meet specific ation in this configu ration.
3.
Disconn ect the differe ntial amplifie r and sweep oscilla tor. Re-conn ect the
audio oscillat or to the left input at +10 dBm. While monitor ing TP3 with
an audio voltmet er, confirm that the frequenc y response is down not more
than 0.5 dB at 10 kHz, and not more than 1 dB at 15 kHz. Also, check that
the stopband response is down 40 dB or better at and above 19 kHz.
4.
Repeat step 3 for right channel at TP4.
SEPARATION ADJUSTMENT
1.
Insert the de-emph asis network and switch in the stereo generat or's left
and right channel pre-emp hasis network s (switche s S1 through S4 to right).
2.
Set the front-pa nel SEPARATION LEFT and SEPARATION RIGHT control s of the
stereo generato r to mid-pos ition. Also, set the variable capacito r (C6) on
the 53 kHz lowpass filter (FL-3) to half mesh.
3.
Set the audio oscillat or to 500 Hz at +10 dBm, feeding left channel only.
4.
Set the stereo generato r in MONO mode and monitor the composi te output at
J102 on a scope. Externa lly synchro nize the scope sweep with the audio
STEAM POWERED RADIO.COM
15
oscillator. Adjust the front-panel OUTPUT LEVEL control on the stereo generator until the output signal measures 3. 5 volts peak-to-peak on the
scope.
5.
Set the stereo generator in STEREO mode and adjust the STEREO GAIN control
(R61) for an output of 3.5 volts peak-to-peak at J102.
6.
If scope performance has previously been verified, skip this step.
Check
oscilloscope phase shift and overload characteristics by moni taring the
signal at pin 2 of the electronic switch U9. Set the scope vertical amplifier sensitivity to 5 mV/cm, de. Ideally, a flat baseline should be observed because the actual separation at this point is well in excess of 60
dB. A scope which displays a baseline whose variation is 2.5 mV peak-topeak or less is acceptable for the remainder of these adjustments. This
amount of variation limits the accuracy of further separation adjustments
to 58 dB.
If the scope displays more than 2.5 mV peak-to-peak baseline
variation, which is not caused by poor overload characteristics, it may be
possible to correct this by properly adjusting the high-frequency compensation circuits in the scope's vertical amplifiers.
7.
Once the performance of the scope has been verified, keep it set at 5 mV/cm
de and monitor the stereo generator output at J 102.
Adjust the LEFT
SEPARATION control for a flat baseline at 500 Hz. See figure 3, photo 1.
8.
Set the oscillator to 14 kHz, and adjust the variable capacitor (C6) on the
53 kHz lowpass filter (FL3) for a flat baseline.
NOTE:
In case of failure of a component in FL3, the entire filter
assembly must be replaced.
9.
Repeat Steps 7 and 8 until the baseline is flat at both 500 Hz and 14 kHz.
10. With the oscillator at 500 Hz, feed a right only signal and adjust the
RIGHT SEPARATION control for a flat baseline.
11. While observing the baseline amplitude, manually sweep the oscillator from
500 Hz to 15 kHz for both left only and right only input conditions.
Verify that the worst case baseline amplitude is no greater than 15 mV
peak-to-peak (3 cm peak-to-peak). This corresponds to a separation figure
of 47 dB and usually occurs around 8 kHz.
PILOT ADJUSTMENT
1.
Feed signal to both inputs in phase (L+R signal). Set oscillator to 500 Hz
at 2.45 volts rms and switch stereo generator to MONO mode.
2.
Verify that the stereo generator output at J 102 is 3. 5 V peak-to-peak .
Adjust front-panel OUTPUT LEVEL control, if necessary.
3.
Connect the output (J102) of the stereo generator through a 5000 ohm pot to
the baseband input of a BW-85A (BW-185) stereo monitor.
Set the monitor's function switch to TOTAL and the range switch to MOD.
Adjust the pot until the monitor reads 100% modulation.
STEAM POWERED RADIO.COM
16
Composite Stereo Waveform
2
3
(L -R} Subcarrier with Pilot
{l+R) Main Channel with Pilot
4
6
Composite Stereo Waveform,
Insufficient (L - R)
Composite Stereo 1,aveform,
Excess (L -R)
Composite Stereo Waveform, Phase
Error Between (L+R) and (L-R)
1
8
(L-R) Subcarrier with Pilot,
Pilot in Phase
(L-R) Subcarrier with Pilot ,
Figure 3,
Pilot Phase Incorrect
11<247
Oscilloscope Waveforms
4.
Switch the stereo generator to STEREO mode and adjust STEREO GAIN control
(R61) until the monitor indicates 91% modulation.
5.
Switch stereo monitor function switch to
generator's PILOT LEVEL control (R46).
6.
Using a plastic tuning tool, adjust PILOT PHASE control (L 1) for maximum
pilot level.
PILOT,
and center the stereo
7, Adjust PILOT LEVEL control (R46) for a pilot amplitude of 9% on the stereo
monitor .
STEAM POWERED RADIO.COM
17
8.
While watching the Hz deviation meter on the stereo monitor, adjust PILOT
FREQUENCY control (C54). Make sure that pilot frequency can be adjusted to
either side of 19 kHz, and then set it 0.5 Hz high.
9.
Reverse the signal leads to the right input (L-R signal) and monitor the
stereo generator output (J102) with a scope. Using a plastic tuning tool,
adjust PILOT PHASE control (L1) for correct pilot phase as reflected by the
scope "bow tie" pattern. See figure 3, photos 7 and 8.
10. Check that pilot amplitude is still 9%.
(R46), if necessary.
Adjust the PILOT LEVEL control
REMOTE FUNCTIONS
1.
Verify that the metering samples (J101 pins 7 and 9) are approximately 0.8
volts rms . Pin 7 is the left sample and pin 9 is the right sample.
2.
Check external mode lines for proper operation. Short pin 12 of J101 to
ground for mono mode and short pin 10 of J101 for stereo mode of operation .
FINAL CONSIDERATIONS
The stereo generator, as it now stands, is optimally aligned in all regards.
Separation and crosstalk from all causes for frequencies between 50 Hz and 15
kHz will be in excess of 45 dB. Therefore, no further adjustments should be
performed on the stereo generator. During the final performance verification,
the BW-85A (BW-185) FM monitor will be used to secure the majority of readings
included on the final test data sheet.
If, during final test, the monitor
produces unfavorable readings avoid any temptation to adjust the stereo
generator.
Rather, recalibrate the monitor in accordance with instructions
supplied with it.
STEAM POWERED RADIO.COM
18
PARTS ORDERING INFORMATION
REPLACEME NT PARTS
Repl acement parts bearing a Stock Num ber should
be ordered by Item, Description, and Stock Number
from RCA, Distributor and Special Products Division,
Deptford, New Jersey 08096. Items listed under a
Master Item (Ml) Number should be ordered from RCA,
Commercial Commun icati ans Systems Division,
Camden, NJ 08102.
ing modification of the customer's design. In some cases,
parts and/or instructions for adapting the substitute
parts will be supplied. In no way will the substitute parts
impair the operation or performance of the equipment.
For information regarding the use of any parts
received, write RCA, Tech Alert, Bldg. 2-8, Camden, NJ
08102, or call (609) 338-3434.
EMERGENCY PART SERVICE
Because of possible products modifications and/or
the unavailability of parts," the item which will be supplied aga inst an order for a replacement part may not be
an exact duplicate of the original part. As a result, some
of the replacement parts received may require a mount·
LOCATION
Continental United States,
including Alaska and
Hawaii
For emergency part service during working hours,
contact RCA Distributor and Special Products Division,
telephone (609) 848-5900 or (609) 541-3636 extension
2234 or 2235. After working hours (Eastern time)
telephone (609) 853-0560.
ORDERING INSTRUCTION S
I IPnlacement Parts bearing a STOCK NUMBER should ue ordered from RCA Distributor
and Special Products Division - 2000 Clements Bridge Road - Deptford,
NJ 08096.
Replacement Parts bearing a MASTER ITEM (Ml) NUMBER should be ordered from
RCA, Commercial Communcation s Systems Division - Camden, NJ 08102 or
your nearest RCA Regional Office.
Replacement Parts with NO STOCK or MASTER ITEM (Ml) NUMBER are standard
components. They are not stocked by RCA and should be obtained from your local
electronics d istributor.
Dominion of Canada
Order from you r local RCA Sales Representative or his office or from : RCA Victor
Limited, 1001 Leno ir Street, Montreal, Quebec.
Outside of Continental
United States, Alaska,
Hawaii, and the Do•
minion of Canada
Order from your local RCA Sales Representative o r from: RCA International Division,
Clark, New Jersey - U.S.A. - Wire: RADIOINTER
STEAM POWERED RADIO.COM
Emergency: Cable RADIOPARTS , DEPTFORD, NJ
19
REPLACEMENT PARTS
S ymbol
Stock N o.
Description
Drawing No.
BTS-101A STEREO GENERATOR Ml-561061A
MAIN FRAME
Cl Ol THRU
Cl05
241490
410PF 20¾ 560V FEED•THR.U
CRlOl
CRl02
44lb35
441b35
LED~ AMB~R , STEREO
LED ,. AMAF.R, MCNO
FlOl
FlOl
427383
98t05
FUSE ,. 1/4 AMP 250 V ( 120 \TAC I NPUT)
FUSE• 1/8 AMP 250 V (2~0 VAC INPUT)
FL101 THRU
FL106
427389
JlOl
J102
444316
223973
Ll01 THRU
Ll05
425969
3000PF 500V FEED-THRU
CONNECTOR - INP UT
CONNECTnR ~ OUTPUT
INDUCTOR lOIJH
RlOl
IHOZ
Rl03
444324
444324
444324
1000 OHM VAR (SEPARATION LEFT)
1000 MHM VAR (SEPARATION RIGHT )
1000 OHM VAR (OUTPUT LEVEL )
s101
444333
SWITCH
TlOl
Tl02
Tl03
44t.32T
42b792
426792
TRANSFORMER• POWER
TRANSFORMER• AUDIO
TRANSFOR MER• AUDIO
u101
u102
4Z9929
444326
I,C, ~ TVPE LM309K
l,C, ,. TVPE UA7812~C
XFlOl
429892
HOLDER, FUSE
XUlOl
XU102
248368
248368
SOCKET~ KIT, FOR UlOl
SOCKET " KIT, FOR Ul02
r-
Tn5GLE, STEREO/MONO MODE
STEREO PW BOARD
Cl
230245
CZ
4Z3708
C3
C4
C5
Cb
C1
cs
C9
ClO
Cll
Cl2
Cl3
Cl4
Cl5
Cl6
Cl7
Cl B
Cl9
C20
STEAM POWERED RADIO.COM
423708
213496
228720
420561
435312
io23708
435312
423708
433046
230048
215380
426858
446680
42602'1
423708
424800
424800
423708
150 PF 5% 500V MICA
100000P~ 20n 25V CER
lOOOOOPF 20, 25V CER
47PF Z% 500V MICA
Z40PF 1% 500V MICA
,47 UF 3% 100V FlLM
10 UF 10• 26V TANT
lOOOOOPF 20~ 25V CtR
10 UF 10% 26V TANT
lO OOOOPF 201 25V CcR
5PF •••'PF 500V MICA
9lOPF 51 5oriV MICA
1800 PF 5t ,oov MICA
lllOPF 2% 500V MICA
100000 PF 20% 50V GLASS
lOOOOPF 20¾ 50V CER
lOOOOOPF 20~ 25V C£R
220Uf 20% 1 0 V TANT
220UF 20¾ lOV TANT
lOOOOOPF ZOt 25V CER
20
Symbol
C21
en
C23
C24
C25
C26
(27
c2a
C29
C30
C3l
(32
C33
C34
C35
C36
C37
C38
C39
C40
C41
C42
C43
C44
C45
C46
C47
C48
C49
cso
C51
C5 2
Stock No.
4237.)8
228718
230245
440047
432015
1t237U8
228720
4237 0 8
420561
423708
423708
4330(16
230048
2153BQ
426858
423708
426027
423708
1,24 800
4248 00
',26033
423708
426027
42370 8
435312
423708
426027
435312
423708
424275
426027
435312
238220
440047
C53
C54
C55
C56
4237 0 8
C57
426027
435178
C58
C59
435312
C60
435312
Col
242964
C62
242964
1,23664
(63
420492
C64
C65 '·'1:''l.U
423664
C67
CRl 'i',fRU
CR4
234552
CR5
242220
CR6
242220
CR7
2 34552
Drawing No.
Description
lOOOOOPF 20% 25V r: ER
75PF 5% soov MICA
150 PF 5¾ 500V MIC:A
l5PF - 60PF VARIABL E, 15 KHZ FLAT
lOPF +~,5PF 500V MICA
l OOOOOPF 20¾ 25V CER
240Pf 1¾ 500V MICA
lOOOOOPF 20¾ 25V CER
,47 UF 3¾ lOOV FIi M
lOOOOOPF 20% 25V t.ER
lOOOOOPF 20% 25V CER
5PF +- . 5PF 500V MICA
910PF 5¾ 500V MI CA
lBOOPF 5¾ 500V MICA
lllOPF 2% 500V MICA
l OOOOOPF 20% 25V CER
l OOOOPF 20% SOV CFR
lOOOOOPF 20 ¾ 25V C:ER
220UF 20% lOV TANT
220UF 20% lOV TANT
2PF 10¾ 500V MICA
lOOOOOPF 20% 25V CER
lOOOOPF 20% 50V CFR
lOOOOOPF 20% 25V CER
10 UF 10% 20V TAN T
lOOOOOPF 20% 25V CER
lOOOOPF 20¾ 50V CFR
10 UF 10% 20V TANT
lOOOOOPF 20¾ 25V CER
3PF 5% 500V MICA
lOOOOPF 20¾ 50V CFR
10 UF 10¾ 20V TANT
470 PF 5% 500V MI<'.A
15PF - 60PF VARIAR LE, PILOT FREQUENCY
TRiM VALUE (OPTIONAL)
lOOOOOPF 20% 25V CER
lOOOOPF 20% 50V CER
3300PF 10% lOOV MTCA
10 UF 10% znv TANT
10 UF 10% 20V TANT
500 UF 75V ELECT
500 UF 75V ELECT
lUF 10¾ 35V TANT
2,2UF 10¾ 35V TANT
lUF 10¾ 35V TA·NT
DIODE•
DIODE .,
DIODE•
DIODE •
TYPE
TYPE
TYPE
TYPE
1002
1N4154
lN4154
1002
Kl
1
,44311
RELAY
L1
4466137
COIL 15•40 MH PILOT
01
02
420558
241778
2N3053
2N4037
TRANS I STDR
TRANSISTOR
TRANSISTOR
TRANSISTOR
08
2N3053
TRANSISTOR - TYPE 2N3053
RS
435554
440074
t,46684
446678
108865
440074
825 OHM l¾ l/8W FILM
475 OHM l¾ 1/BW FILM
1000 OHM VARIABLE, LEFT GAIN
1020 OHM 1% 1/BW FILM
1000 OHM 5% 1/4\./ COMP
475 OHM l¾ l/8W FILM
03
04
-
TYPE
TYPE
TYl'E
TYPE
PHASE
2N3819
2N3563
2N30 53
2N4037
05 THRU
R6
R7
RA
R9
RIO
STEAM POWERED RADIO.COM
~
21
Stock No.
Symbol
428519
RI l
Rl2
436330
1146679
Rl3
108865
Rl4
1136791
R15
1+36310
R!6
Rl7
1088':>l
RlB
4376l!2
Rl9
230605
R20
4 376 '!2
R?l
108861
R26
4355'i4
R?7
440074
1+466'l4
R?8
R29
'146678
108865
R30
R31
'+400 74
R32
428519
R33
43t33o
44t679
R34
4268'.;;J
R35
108864
R16
436791
R37
R38
436330
R39
108861
,,376 tJ2
R40
2306 0 5
R'+l
1, 3768?
R42
108861
R43
R44
436331
R45
232289
431:7 9 5
R46
R47 1i:'m
10886<;
R50
108866
R5l
2 J875R
R52
108861
R53
4350'>6
R54
R~5
1088'>5
1088 1>1
R~6
446678
R57
4334 •11
R58
R59
l1363Jl
R60
108867
436791
R6l
1088b l
Ro2
113768?
R63
R64
43763?
1144542
R65
R66
427566
427566
R67
44454?
R68
113524
R69
4416g4
R70
R71
512147
218499
R72
R73
426213
R74
108866
R75
2184'19
2 18499
R76
R77
426213
R78 T:-:'RU
218499
R80
RAl
108866
'.>12147
RAZ
R83
4 262 33
426233
R64
Drawing No.
Description
4750 OHM 1% 1/lOW FILM
22100 OHM 1% l/8W FILM
34000 OHM 1% 1/RW FILM
1000 OHM 5% l/4W r.OMP
10000 OHM LINEAR VARIABLE, LEFT PRE - EMPHASIS
22100 OHM 1% l/8W FILM
100 OHM 5% l/4W cnMP
4990 OHM 1% 1/BW FILM
27 OH~ 5% l/4W COMP
4990 OHM 1% 1/RW FILM
100 OHM 5% l/4W COMP
825 OIIM l% 1/8W FILM
475 OHM l ¾ l /8W FILM
1000 rl HH VAPIABLE, 150 HZ
1070 • HM 1% 1/AW FILM
1000 nHM 5% l/4W COMP
475 OIIM 1% J /8W FI LH
4750 UHM 1% 1/!CW FILM
22100 OHM 1% 1/AW FILM
34000 OHH 1% 1/BW FILM
1000 OHM LINEAR V6RIABLE, 15 KHZ
470 OIIM 5 % 1 / 11W U lMP
10000 OHM LINEAR VARIABLE, 1500 HZ
22100 OHM 1% l/8W FILM
100 OHM 5% 1/4W COMP·
4990 OHM 1% !/AW FILM
27 OHM 5% l/4W COMP
4990 UHM 1% 1/AW FILM
100 OIIM 5% l /4W cnMP
47500 OHM 1% 1/AW FIL M
470000 OHM 5% l/4W CO MP
100000 OHM L INEAR VARIABLE, PI LOT LEVEL
1000 • HM 5% l/4W r.OMP
2200 nHM 5% l/4W COMP
220 OHM 5 % I/4W COMP
100 OHM 5% l/4W cnMP
1000000 OHM 1% 1/4 FILM
1000 OHM 5% l/4W COMP
100 OHM 5% l/4W cnMP
1020 flHM 1% 1/AW FILM
5620 nHM 1% l /8W FILM
47500 OHM 1% l/8W FILM
6800 OHM 5% l/4W r.OMP
10000 OHM LINEAR VAR IABLE, STEREO GkIN
100 OHM 5% l/4W cnMP
4990 • HH 1% l/8W FILM
4990 flHM 1% 1/8W FILM
!BO OHM 5% l/4W cnMP
68000 OHM 5% l/4W COMP
68000 OHM 5% l/4W COMP
180 OIIM 5% 1 / 11W cnMP
2700 • HM 5% l/4W COMP
820 OHM 5% l/4W cnMP
470 OHM 5% l W cnMP
10000 OHM 5% l/4W COMP
4700 OHM 5% l/4W r.OMP
2200 UHM 5% l/4W COMP
10000 OHM 5% l/4W COMP
10000 OHM 5% l/4W COMP
4700 • HM 5% l/4W COMP
10000 OHM 5% l/4W COMP
2200 OHM 5% l/4W COMP
470 OHM 5% lW COMP
22 OHM 5% l/4W COMP
2 2 OHM 5% l/4W COM P
51 TIErn
S6
432426
STEAM POWERED RADIO.COM
SWITCH - SLIDE DPDT
22
Symbol
Stock No.
TPl
TP2
TP3
TP4
TP5
TP6
TP7
Ul 'rHRU
U6
U7
us
U9
UlO
U11
Ul2
Ul3
Ul4
Ul5
U16
Drawing No.
Description
425993
42599;:,
425994
425990
4259'l9
425988
4z59g7
JAC:K JACK JAC:K JACK JACK•
JACK JACK -
ORANGE
YELLOW
GREEN
BLUE
VIOLn
GREY
WHITE
lt355 1)4
423797
1,23797
446683
4355 0 4
435504
425796
422417
425797
433814
438486
I , C,
I,C .
I , C.
I , C,
I , C.
I , C.
I , C,
I , C,
I , C•
I,c.
I , C•
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
TYPE
-
LM318N
UA741r.P
UA74lCP
Hl.:.201- 5
LM318N
LM318N
SN7404N
SN7490AN
SN7493N
SN7474J
UA7917.UC
XO! 'I'HRU
X08
446686
SOCKET - TRANSISTOR
XUl 'I'llRU
XU8
XU9
XlJ l O
XUll
SOCKET •
SOCKET SOCKET ~
SOCKET •
XU12
44433;>
446685
1,443·)2
444332
I,C.
I , C.
I • C.
I • C,
SPIN
)6PJN
SPI N
BPIN
THRU
Xlll 5
444315
SOCKET - I • C. i4PJN
XYl
444314
CONNECTOR
Yl
'• 4'1312
CRYSTAL - 3,04MHZ
-
(XTALl - TWO REQUIRED
DUAL INPUT PADS
Rt 'T'HRU
R4
426234
Ri'2 'I'HRU
R25
426234
820 OHM 10¾ l/4W
820 OHM 10¾ l/4W
(.• MP,
r. • HP.
53 kHz LOW PASS FILTER
FL3
446681
53 KHZ LPF
FLl , FL2
CI
C7.
C3
C4
cs
15kHz LOW PASS FILTER Ml-561O64
441639
l2 7692
441641
441642
441640
STEAM POWERED RADIO.COM
1930
360
2530
1815
2200
PF 2¾ 500V MICA
PF 5¾ soov MYCA
PF 2¾ 500V MIU.
PF 2¾ 500V MICA
PF u 500V MT CA
23
Symbol
Cb
Stock No.
Drawing No.
Description
C7
444303
444303
1300 PF 5¾ 500V MTCA
1300 PF 5¾ 500V MYCA
L2
L4
L6
444306
444305
114430 4
INDUCTOR, VARIABLE
INDUCTOR, VAR I ABLE
IND UCTOR, V'.HI"BLZ
INTERCONNECT CABLE FOR BTE-115 STEREO SYSTEM
Ml-561067
3729869-506 REV 1
5Pl
5P3
5P4
5P5
5P6
5P7 THRU
5Pl2
446036
445153
445 155
445152
445152
3729870-0011
3729870-0008
3'729870-0010
3'729870-0006
3'729870-0006
CONNECTOR, 24 CONTACT MALE
CONNECTOR, 6 r. • NTACT FEMALE
CONNECTOR, 12 r. • NTACT Ff;MALE
CONNECTOR, 8 r.nNTACT HMAl,E
CONNECTOR, 8 ('.ONT ACT FEMALE
431554
444754
993150-0061
3729870-0012
CONNECTOR, BNC
CONNECTOR, 24 CONTACT FEMALE
STEAM POWERED RADIO.COM
24
SUGGESTED STATION SPARES
Stock
No.
Quantity
Domestic
Foreign
Descrieti on
Symbo l
Crystal, 3.04 MHz
Yl
444312
1
1
Fuse, MDL, 1/4A ( 120V
Input)
FlOl
427383
5
5
Fuse, MDL, 1/8A (240V
Input)
FlOl
098105
5
5
Transisto r, 2N3819
Ql
420558
1
1
Transisto r, 2N3563
Q2
421778
1
1
Transisto r, 2N3053
Q3, 05 thru 08
2N3053
2
2
Transisto r, 2N4037
Q4
2N4037
1
1
Potentiom eter, lK 10-turn
trimmer
R35
426851
1
1
Integrated Circuit, LM318
Ul thru U6, UlO,
Ull
435504
3
3
Integrate d Circuit,
Hl-201-5
U9
446683
1
1
Integrate d Circuit, UA741CP
U7, U8
423797
1
1
Integrate d Circuit, 7404N
Ul2
425796
1
1
Integrate d Circuit, 7490AN
Ul3
422417
1
1
Integrate d Circuit, 7493N
U14
425797
1
1
Integrate d Circuit, 7474J
U15
433814
1
1
Integrate d Ci re ui t, LM309K
regulator
UlOl
429929
1
1
Integrate d Circuit, 7812
regulator
U102
444326
1
1
Integrate d Circuit, 7912
regulator
U16
438486
1
1
STEAM POWERED RADIO.COM
25
N
0
0
I-
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LL.
"-x
.......
L:C
I-
31:
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>-
Q.
U)
(.)
a::
I-(!)
0
•
ic,
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0
&&.
N
.J
•
.J
U)
..J
N
.J
~/-
IO
0
I-
"'
0
..,
-(!)
Q.
N
a::
1-0
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Figure 4.
STEAM POWERED RADIO.COM
..J
LL.
BTS-101A Top View
26
-
OUT
+
•
S5
LPF
R7
LEFT
GAIN
IN
0~50
LI
C54
PILOT
FREQUENCY
PILOT
PHASE
C60
©
3K049
C24
15kHz
(FLAT)
R35
15kHz
R28
150Hz
OUT
+ss
R37
l500Hz
tLPF
R61
STEREO
GAIN
R46
PILOT
LEVEL
*
NOTES:!.
DENOTES OPTIONAL OR TRIM COMPONENT.
2. FOR COMPONENT LAYOUT, SEE FIGURE 12.
-
IN
Figure 5.
PW Board Switches and Adjustment
20A2642
Figure 6.
IK213
Dual Input Pad Components
STEAM POWERED RADIO.COM
-
27/28
'
I
Ti03
CIOI
,.l_;70PF
LIOI
IOuH
JIOI
-,
RI
820
6
I
1o2
LI02
i
I
I
I
I
'-
47PFl1-----
ACTIVE
RII
RIO
475
+
+ 12V
1501
PF
1K
1%
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470PF
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R43
100
-12V
_ _J
S4
240 VAC
FILTER
+12v
+ 24V
TP6
GRY
BLK
C61
500
75
+
C63
1/35
CR4
IOD2
C62
500
75
+
I.
R46
IOOK
t--------1• +5V
+ C65
l
l
PILOT
LEVEL
C51
DRIVER
1/35
, l -0 1
B
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U102
R55
IK
-
-
_J
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C66
1/35
3,04 MHr
30A0043
3
U 16
7912UC
2
+5V
C67
l/ 35
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01
2N38 19
C56
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2200
4
3
5
6
12
II
5
14
II
7490
Ul2B
14
3
6
9
7
10
2
3
u1sl
7474
3
( -;-2)
(74)
(-;-10)
7404
2
Ul4
7493
10
14
:(-'-2)
13
10 4
R50
R52
220
AMllt:R
7
I
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Q7
2N3053
R73
R77
4700
4700
R79
IOK
I
I
I
I
I
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12
I
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I
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20 5101
MONO STEREO
MODE
.,,
---~:;~~-----1~>---
...
12
10
JIOI
I
PILOT
FREOUENCV
9
8
Ul3
2
R53
100
12
5
l'
14
7
C5 3
r470PF
C64
2.2/35
IK
DIVIDERS
YI
+
i
I
R49
R48
+sv
~
_ _ _ _ _ _J
IK
02
2N3563
+5v
I
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UNLESS OTHERWISE SPECIFIED
,o
20
Ul2A
7404
+5V
BUFFERS
2200
u
L.[.0.
HP50824557
I
R72
IOK
+sv
C58
3300
PF
+12v
7
7812
R47
IK
IK
+sv
-
TP7
WHT
-24V
NOTES :
IOK
~ - ----,2,C 7404 ~1----+--<-19_K_H_z_ _,__~
R56
100
CR3
1002
BLK / WH
RBO
C60
06
2N3053
C 57
.QI
OSCILLATOR
E
L
8LK / RED
FLI04
T
+5V
-12V
C
I
CRI
1002
UIOI
309
B
5
WHT
R79
IOK
R76
IOK
R75
IOK
A,
PILOT
PHASE
L
RII
+ 5V
7
I
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(USE . 125 AIIP FUSE)
WH
IMONO
+12v
5010-50
i
GRN
I
LATCH
tl2V
l9KHr
4701<
PRE-EMPHASIS
WIRING FOR
CR2
IOD2
MODE
AMBER
R45
REGULATORS
.25A
S. B.
19
_J
CRIOZ
L.E .O.
HP50824557
1
TIOI PR IMART
120 VAC
~J
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+
T
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LI
[
7
I
TP4
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R84
6
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22
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741
FIOI
CRIOI
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R74
2200
9
8LK
,1
STEREO
1%
'-;
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TIO I
3-1067
I
R44
47.5K
16
,
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r
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Rl2
470
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OHH122 5
S3
C40
220/10
>-6_ _ _ _ _.__+~~-------~29
1%
R37
IOK
C34
1800
U6
318
FL 2
AUDIO LPF
20A2633
R38
22.1 I(
t
+12v
R7I
470
38KHr
C39
220/ 10
1%
R36
470
s 910PF
D------'f
R42
4990
R35
~ C33
06 +12v
S6
.:' J
15 KHz
_J
R
~
+ 12v
R40
4990
U4
1%
34K
~
R4I
27
R39
100
6
1%
1%
-- -- -
7
3
2
us
318
4
R29
1020
R25
820
'
R28
IK
150
Hz
t¾
22.1 K
TP2
YEL
1
240PF
'8KHr
1110 PF 2 °/,i;,
C30
C27
6
5
R23
820
7
ti
1%
T 102
SAT-109
R22
820
470PF
t12V
C26
C35
tl2V
tlD71J• ltlY A
3K051
L
RESISTOR VALUES ARE IN OHM$ , l/4W, 10% .
CAPACITOR
2.
STEAM POWERED RADIO.COM
VALUES ARE IN MICROFARADS.
* OPTIONAL
Figure 7.
BTS-101A Stereo Generator Schematic Diagram
29
-
L4
L2
3-4005
L6
3-4006
3-4007
A
B
C2
360
C6
1300
C4
1815
I
Tc1
IC3
IC5
'.93025302200
IC7
~ 300
--------------------Qc
NOTES
I. UNLESS OTHERWISE SPECIFIED
CAPACITOR
VALUES
ARE
IN
9IA7081
PICOFARADS.
IK214
-
Figure 8.
Audio Lowpass Filter Schematic
L6
L4
L2
3- 4007
3- 4006
3- 4005
NOTES:
I.
UNLESS OTHERWISE SPECIFIED
CAPACITOR VALUES ARE IN PICOFARADS.
STEAM POWERED RADIO.COM
2042655
IK21!5
Figure 9.
Audio Lowpass Filter Components Location
30
-
C6
5- 6 0 p F
L 2
LI
3- 4001
3-4000
C2
I 10
3-4003
C4
L4
200 PF
PF
C3
Cl
L3
C5
3-4002
C7
0
9IA7064
Figure 10.
53 kHz Filter Schematic
20A2632
Figure 11.
STEAM POWERED RADIO.COM
IK216
53 kHz Filter Components Location
IK217
-
31/32
-
20B2723 REV II
NOTES;
I.
UNLESS OTHERWISE SPECIFIED RESISTOR VALUES ARE IN OHMS, l/4W,
DENOTES OPTIONAL OR TRIM COMPONENT.
2.
*
-
10%,
a
3KOISO
CAPACITOR VALUES ARE IN MICROFARA S.
Figure 12. BTS-101A Stereo Generator
Components Location
STEAM POWERED RADIO.COM
33/34
I s,.;1
OFF FRE(l
5PZI
BLK
~ f--t---------------'-Rc::E:.::D:...__ _--i--<;
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5
6
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li'/1014TE
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! (-:-+---------1LJ
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{
TO EXCITER
CONTROL
PLUG
SWTMJYN
6
I
~----'-=------1/0
SKI
TO TRI/NSMITTER
//FC
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BR//SS 5<13
1 5XKI
om
I
5<12
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5
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POWER
S01/RCE
717
INTERF/lCE/R/10//1TE P/1NEL
Ml-56107/
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fl/1010
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FOR POWER C0R£!.S
ON EXCITER UNITS
,.;j
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SILVER
m
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7}
TO EXCITER
9
--+.:}---'-f,---fi RF OUTPUT TO
Ml-561067 INTERCONNECT
rJ
TRl1NSM/TTER
Cl1BLE
OUTPUT
,/l1CI(
fx1:?1::R
5P4
-
LEFT
/11/0/0
IN
5PI
I
2
{
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'
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6
3
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4
RIGHT
1/(/0/0
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:
1
I
;4
I
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5
INPUTS
TO STEREO
GENERl1TOR
STEREO ON l6E-+---1:.C,,-----,h-, ----« /0
1
1
MONO ON 17 :
T
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1./Z
1
COM l 8 ~
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0
5P3
I
7 ,_,,_...,-_,_,_ _ _......,__ _;.._, 3 METERING
8
OUTPUTS
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7
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MONO{l
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, , 1 7
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IN
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Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.5 Linearized : Yes Author : RCA Create Date : 2018:04:21 13:25:56-07:00 Keywords : RCA BTS-101A Stereo Generator Manual, RCA BTS-101A, BTS-101A, BTS101, RCA Stereo Generator Modify Date : 2018:04:21 14:11:00-07:00 Has XFA : No XMP Toolkit : Adobe XMP Core 5.6-c015 84.159810, 2016/09/10-02:41:30 Producer : Adobe Acrobat Pro DC 18 Paper Capture Plug-in Format : application/pdf Title : RCA BTS-101A Stereo Generator Manual Description : RCA BTS-101A Stereo Generator Manual Creator : RCA Subject : RCA BTS-101A Stereo Generator Manual, RCA BTS-101A, BTS-101A, BTS101, RCA Stereo Generator Metadata Date : 2018:04:21 14:11-07:00 Document ID : uuid:1a14730c-b23f-4f41-8840-c1649549ab63 Instance ID : uuid:e42b70eb-3a2b-4441-ac82-c45e7e56e472 Page Count : 41EXIF Metadata provided by EXIF.tools