Elettronika S r l PLLCS 250 WATT FM TRANSMITTER User Manual

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Document Title	User Manual

PLL/CST-3
FM Radio Transmitter
User’s manual
Ergéflwuflm
CODE: A1875
TITLE: PLL/CST-3
REV:0
DATE: 27/05/02
m1
ngistratmn number: ”47606
SS 96 Km 113
70027 Palo del CoIIe (Ba) ITALY
Tel. +39 (0)80 626755
Registration number: 1744445 Fax +39 (0)30 629262
E—mail: elenronika@eletlronika.it
C E 0682 (g) Web site: http://www.elettronika.it
Index
Index
Warning ..
Warranty.
Introduction ..
Content of the manual
Treatment of electrical shock.
Firstaid ..............................
Treatment of electrical burns
Note...
Section 1" - "Information"
1.1 Description...
1. 2 Technical chamcteristics.
Section 2 - Installation
2.1 Operating environement .
2. 2 Preliminary operations ....
2.3 Telemeasuring socket.
2.4 Functioning
2.5 Preventive maintenance .
Front panel .
Rear panel . .
Section 3 - Diagram
Cable diagram ......
A 1870 PLUGS-3 — Component list
SCH0049AR3 (FM Transmitter board)
PN4 1 7 {MPX Stereocoder board) .
PN396 (Display board)
PN437/A {FM DriverAmplrfrer).
PN438/B (Directional coupler and Low Pass filter) ..
PN41O (300W FM Amplifier module) ..
PN515 (P0 wer regulator board) ............
E0013 (SP500—48—DE2 Switching power supply) ..
Adjustment and test - Appendix
Test procedure .......................
RF Section .................................................
Mother board (Modulation/Limitation circuit).
Main characteristics of the FM transmitters
This page is intentionally blank
WARNING
The apparatus described in this manual has been designed and manufactured with devices to safe-
glard the users. In any case it is recommended that during any operation of installation, maintenance,
miscellaneous interventions and calibrations requiring the apparatus to be switched on,
THE ER TAKE ALL THE
PRE A TI A A T IDE T
It is required to use the proper clothes and protection gloves in order to prevent damages from inci-
dental contacts vvith high-voltage parts.
The manufacturer declines every responsibility in case the recommendations above are not followed
IMPORTANT
“he component lists attached to the relevant electrical diagrams indicate for each item the reference,
he description and the type normally used.
"he Elettram'ka SJLL though reserves the right to use or supply as spare parts components with
equivalent characteristics but of a different type, assuring anyway the optimal work of the apparatus
in accordance with the specifications.
"he enclosed monographs are solely owned by Elettmnika S.r.L
"he use of anything enclosed in this technical manual without explicit authorization given by Elettmm’ka
S.r.I. will be prosecuted by the law.
"he data and technical characteristics of the apparatus described in this manual are not compelling for
he manufacturer.
‘he Eletmmika S. r.l. reserves the right to make, without previous notice, modifications or updates in
order to improve the quality of the product.
r 9
"he general conditions of supply and sale are described in the contracts.
“he delivery time are in accordance with the products and quantities ordered.
Warranty
Summary ofwarranly
We, ELETTRONIKA Sr I., 55096 Km I 13 2.1, PALO DEL COLLE (EA) ITALY, warrant to the ORIGINAL PURCHASER ofa NEW product, fora
period ofone (1) year from the date o/purchase by die ortgtnal purchaser (the "warrantypertod ") diat the new ELElTRDNIKA product is fiee ofdefects
in materials and worhtnanship and will meet or etceed all advertised specifications/or such a product This warranty does not extend to any subsequent
purchaser or user, and automatically terminates upon mk or other disposttion o/our product
Items excluded from thls ELETTRONIKA warranty
We are not responsible for product failure caused by mime, accidentt or neglect. This warranty does not exlend to any producton which the sertal
number has been defaced, altered, or removed. It does not cover damage to loads or any other products or accessories resaltingfiom ELETIRONIKA
product failure It does not cover defects or damage caused by use ofunauthorieed modtficstiorts, accessories, parts, or service
What we will do
We will remedy any defect, tn rnatertal or worhrnanshtp (except as excluded), tn our sole discretion, by repaa, replacement, orrefund. Ifa refiind is
elected, then you must make the defective or malfunctioningcornponent available to to free and clear ofall liens or other encumbrances. The refiand will
be equal m the actual purchase price, not including interest, insurance, closing costs and other finance charges less a reasonable depreoation on the
product from the date ofonginal purchase. Warranty worlt can only be performed at our authorized servtce centers or at ourfiactory Expenses in
remedying the defect will be borne by ELETTRONIKA, including onerway sutfacefietght shipping costs within the Untued State. (Purchaser must bear
the etpense ofshipping the product between any jorelgn country and the port o/entry in the United states and all tastes, duties, and alhercuslom xfeefs)
for such firreign shtpments)
How to obtain warranty service
You must norm; us o/your need for warranty service not mrer than ninety my days after the aplmn‘on ofthe warranty period We will give you an
authorization to return the product for service All components must be shipped in a factory pach or equivalent which, ifneedad, rnay
Dssclalmer of consequsnllal and Incldenlal damagts
You are not entitled to recover from us anywnsequenlialor incidental damages resulting from any defect in our product This includes any dinnage
to an other product or products resulting fiom such a defect
Warranty allerations
No person has the authority to enlarge, or rnodt/y this wmmrlly. The warranty is not mended by the lenght oftlmefor which you are deprtvedof
the use of the product Repairs and replacement parts are provided under the terms of this warranty shall carry only the unetiptred portion of this
There o no warranty whtch eruends beyond the terms hereof Thts written warranty ts given in lteu ofany oral or implied warranties not contained
herein We disclaim all ttuplied warranties, including wtthout limitation any warranties o/tnerchanlabi‘lity or fitness for a particuhtr purpose No action
to enforce this warranty shall be commenced later than ninety 00) days after explrlm‘orl ofthe warranty period
Warranty for slsctronlc lubss
The warranty applied for electronic tubes is the one given by the manufiuw ofthe tube 1n the event that the product shows anomalies within the
deadline ofthe validity ofthe warranty given by the manufacturer of the product ioelf the buyer will have to return it to die seller with the needed
documents and the written description o/the defect. The seller will ship the broken tube w the manufacturer in order to egrect the necessary technical
tests to find out die cause ofdte anomaly. Meanwhtle the buyer ofthe tube who needs to use, M as such to replace tmmeduately the product, will have
to buy a new one andproutde to the relevant payment, fiirther to the issutng by the seller ofa regular commercial invoice. Afler the adequate tests made
by the Immufizcmrer, should the result be pos ve, that is confirm the defect in manufacruring the seller will issue a reguhtr credit nous in the name of
the buyer andreturn the amount paid Should the result be negative, that is detect a negligence in the insutllation or use by the buyer, he will have no
right against the seller
INTRODUCTION
The apparatus described in this manual is the latest of this series, offering high performances, remark—
able reliability and a wide range of characteristics, it all at a low cost
Its is easy to install and user It only takes to follow the installation procedure as shown in this manual:
after having removed all from the package, you only have to follow step by step the description in the
various sections.
Before starting to use the apparatus, remember to:
:| read carefully the general safety information contained in this section;
3 follow the instructions for the installation and set up of the apparatus;
:| read all the remaining sections of this manual in order to know well the apparatus and learn
how to obtain the best of its characteristics
CONTENTS OF THE MANUAL
The chapter composing this manual contain all the information concerning the use of the apparatus
For more information refer to ELETTRONIKA S.r.l,
This manual is made up of different chapters, each made up of various sections, Each individual
chapter represents a single apparatus composing the whole station
WARNING!
4.4 ,
WW I ll' 1 E ].,
This manual is intended as a general guide for trained and qualified personnel who are aware of the
dangers inherent in handling potentially hazaedous electrical and electronic circuits.
It is not intended to contain a complete statement of all safety precautions which should be observed by
personnel in using this or other electronic equipment
The installation, operation, maintenance and service of this equipment involves risks both to personnel
and equipment, and must be performed only by qualified personnel exercising due care
Elettronika S,r,l< shallnotberesponsihle for injury or damage resulting from improper procedures or
from the use of improperly trained or inexperienced personnel performing such tasks,
During installation and operation of this equipment, local building codes and fire protection standards
must be observed.
WARNING!
Alw i nnt wr fr nin V
I l' A] ll 1.]
voltage points before servicing, Never make
int 1 ' tmn rfrmm‘nt n r
service when alone or when fatigued
Do not remove, short-circuit or tamper with interlock switches on access covers, doors, enclosures,
gates, panels or shields,
Keep away from live circuits, know your equipment and don’t take chances,
WARNING!
In fmrn nrtht wrh ni nnt
Treatment of electrical shock
I) If victim is not responsive follow the A, B, C’s of basic life support,
PLA E I TIM FLAT HI BA K AI-IARD RFA E
A - AIRWAY B - BREATHING
If unconscious, open airway lift up neck, push If not breathing, begin artificial breathing. Tilt
forehead back, clear out mouth if necessary, head, pinch nostrils, make airtight seal, 4 quick
observe for breathing. full breaths, Remember mouth to mouth resuscita—
tion must be commenced as soon as possible,
C — CIRCULATION
Check carotid pulse, If pulse Approx, 80sec: ] rescuer, 15 compressions, 2 quick breaths.
absent, begin artificial circulation. Approx. 605ec.: 2 rescuers, 5 compressions, l breath.
N TE' N TINTERR PTRHYTHM F MPRE I N HEN
WW
Call for medical assistance as soon as possible.
2) If victim is responsive:
- keep them warm;
- keep them as quiet as possible;
- loosen their clothing (a reclining position is recommended).
FIRST-AID
Personnel engaged in the installation, operation, maintenance or servicing of this equipment are urged
to become familiar with first-aid theory and practices. The following information is not intended to be
a complete first-aid procedure, it is brief and is only to be used as a reference. It is the duty of all
personnel using the equipment to be prepared to give adequate Emergency First Aid and thereby pre-
vent avoidable Ioss of life.
TREATMENT OF ELECTRICAL BURNS
1) Extensive burned and broken skin.
- Cover area with clean sheet or cloth (cleansed available cloth article);
— do not break blisters, remove tissure, remove adhered particles of clothing, or apply any salve or
ointment;
— treat victim for shock as required;
- arrange transportation to a hospital as quickly as possible;
- if anns or legs are effected keep them elevated.
NOTE
f med1cal .help will not be available within an hour and the victim is conscious and not vomiting, give
h rtifwtrnithrhtr]
Allwvitimt lwl t4 hlf 1 vr ri fl mint
...1... .
2) Less severe burns - (1st & 2nd degree).
- Apply cool (notice cold) compresses using the cleansed available cloth article;
— do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or ointment;
— apply clean dry dressing if necessary;
- treat victim for shock as required;
- arrange transponation to a hospiml as qickly as possible;
- if arms or legs are affected keep them elevated.
10
E mmm
FM RADIO TRANSMITTER
PLL/CST-3
User’s manual
11
12
This page is intentionally blank
INFORMATION
Section 1 - Information
Contents:
1.1 Description
1.2 Technical characteristics
13
I_l
PLLICST-3
FM RADIO TRANSMITTER
1.1 DESCRIPTION
The PLL/CST-3 is a Transmitters for Radio communication in the FM band from 876 to 107 .9MHZ,
The apparatus is supplied with four inputs in order to ensure the compatibility with any Audio signal in input,
These inputs are: a Mono input with Pre-emphasis always enabled, an MPX input for Stereo multiplexed
signals and two SCA inputs for additional digital signals
The Mono input contains a series of low-pass filters able to attenuate by more than 30dB all the frequencies
included between 20kHz and 100kHz, compared to the level of the lSkHz,
A limiting circuit7 acting on all the input signals, works continuosly in order to avoid the modulation to be higher
than +-/ 75kHz<
This family of apparatus uses a Microoontrollerwhich manages the setfings of the transmission frequency with
10 or 100kHz steps, as required Besides, it checks that the set frequency is not outside the band allowed,
manages the display for the display of the frequency and the power, and works as protection circuit for the
correct functioning of the apparatus. The final stage is made up by an RF transistor amplifier, with adjustable
power up to 250W, with Mosfet technology
The cabinet, 3U height, is designed forthe mounting in rack 19’2 Its internal accessibility is ensured removing
the upper panel. The electrical power supply may be selected to be 220 or 110V on the rear panel, in order
to fitto the available main voltage,
Options: The transmitter may be supplied, if required, with Stereo Coder (PN4I 7) for the steree transmission of the
audit) signal.
14
1.2 TECHNICAL CHARACTERISTICS
RF
Frequency range
Output power
RF Output connector/ impedance
87,6 71U79M'Hz
250W
NFemale/SOQ
15
Section 2 - Installation
Contents:
2.1 Operating environment
2.2 Preliminary operations
2.3 Telemeasun'ng socket connections
2.4 Functioning
2.5 Preventive maintenance
- Front panel
- Rear panel
17
;,
2.1 OPERATING ENVIRONMENT
You can install the apparatus in a standard component rack or on a suitable surface such as a bench or
desks In any case, the area should be as clean and well-ventilated as possible Always allow for at least
2 cm of clearance under the unit for ventilation If you set the transmitter on a flat surface, install spacers
on the bottom cover plate, If you install the transmitter in a rack, provide adequate clearance above and
below Do not locate the transmitter directly above a hot piece of equipment.
2.2 PRELIMINARY OPERATIONS
The equioment is made up by modular units enclosed in a strong cadmium metallic container and fixed
so that removing the upper cover plate of the apparatus all the internal circuits can be seen by the
operator The connection between modules are made almost only by means of connector, thus allowing
an easy replacement of broken-down pans. Correct installation of the equipment is important for maximum
performance and reliability. Antenna and earth connections must be installed with the greatest care. The
equipment adjustment isn’t need, because the unit is completely adjusted by our technical staff. This is
the installation procedure:
1. connect the power supply cable of the transmitter to the auxiliary socket on the rear panel of the
amplifier (if used) otherwise connect it to public network (220VAC);
2, connect the antenna cable to the RF OUT on the rear panel of the transmitter.
m ?
sag
(D
WARNINGIII
FOR ELECTRICAL SAFETY REASONS AND IN ORDER TO KEEP THE APPARATUS SAFE THE
GROUND TERMINAL OF THE APPARATUS MUST BE CONNECTED TO THE EXISTING
GROUNDING SYSTEM AND NOT BY USING THE SHIELD OF THE OUTPUT COAXIAL CABLE.
1B
Qt
$5
Now you may connect the power supply and turn on the apparatus. In normal working conditions the grid
pilot light will be turned on and the display will show on its upper line the working frequency, while on the
lower line there will be written “PLL UNLOCKED" flashing, In this phase the output power, independently
from the position of the reguilator on the frontal panel, is kept to zero. Afier a few seconds, during which the
frequency has been stabilyzed, the flashing writing will disapper and the apparatus will be ready to be powered.
2.3 TELEMEASURING SOCKET CONNECTIONS
The following table summarizes the Telemeasun'ng pin connections,
| Power suppry ~ svuo
Flo ll on
2 D'g'm "V“ GNaD.EWH "fibrl'nn
3 Analog 0mm FWD Power
® ® 4 Amlog 0mm REF Power
D 39 Socket 7
2.4 FUNCTIONING
On the frontal panel of the transmitter there is an LCD Display used to show the working parameters of the
apparatus, and four keys allowing to select the readings of these parameters, to set the transmission frequency
and to turn the Stereocoder, if any, on and ofE When you turn the transmitter, the following message appears
on the display:
FREQ. 100.00 MHz
PLL UNLOCKED
may "mam
In detail, the F2 and F3 keys allow to scroll on the upper line of the display the readings of the Forward and
19
‘1
SJ
Reflectedpower, the transmission frequency, the model of the apparatus, the name of the manufacturer and
the audio level of the left and right channels, The F1 and F4 keys, instead, allow to go into Programming
mode. This operation is describedbelow In orderto change the transmission frequency of the PLL/C ittailes
going into Programming mode, which is done by pressing simultaneously the F1 and F4 keys.
Using the F2 or F3 key select the “OUTPUT FREQUENCY” option and confirm with F4 key. Now a new
frequency can be set by using either the F2 or F3 key
To exit from programming mode and confirm the new settings, press the F4 key, to exit without saving the
changes press F1 ‘ To turn the Stereo Coder ON or OFF, press simultaneously F1 and F4, then select the
option “STEREO CODER” using either F2 or F3, and confirm by pressing F4,
Now select either “ON STEREO CODER” or “OFF STEREO CODER” using either F2 or F3, and confirm
F4. If there is no Stereo Coder, these settings will have no effect.
On the lower line of the display there is usually a bar showing the peak deviation of the frequency. In case of
working anomaly, this line will show analarm message In detail:
- “FWD POWER ALARM”: in case the output power is higher than 250W;
- “REFL POWER ALARM”: in case the refiectedpower is higher than 30W;
- “PLL UNLOCKED”: if the I’LL is unlocked.
At the same time inwhich the message is shown, the following also happen:
- the maximum output power is limited to 250W;
- the RF power is limited so that the reflected power is not higher than 30W;
— the working of the RF output module is inhibited.
In case of temperature alarm, the “TEMP ALARM” LED will litup and the inhibition of the final module will
be performed Always on the front panel, there is also the Output power regulator, Set this control to the
desired output power level. Preferably, set the power with an external RF wattmeter connected to the coaxial
line to the antenna. You may also use the RF Power reading on the digital multimeter.
2.5 PREVENTIVE MAINTENANCE
To ensure maximum performance and minimum repair trouble, we strongly recommend you to follow the
below stated guidelines forpreventive maintenance:
1. check the antenna installation and ground connection at regular intervals;
2. keep your apparatus clean and dry externally: this will ensure continuous fimctioning of the front panel
20
:,
controls;
34 if the apparatus has not been used for a long period of time combined with exposure to extreme environ-
mental conditions, open the unit and make a visual inspection
Remove salt, water or ice with a moist cloth before turning the apparatus on Check that the cooling fans are
running freely
44 for general maintenance and top performance, call an authorized service technician to give the apparatus
and the complete antenna/earth connection installation a general check each 12—18 months;
54 check at regular intervals that the air intake located on the front panel is free of dust If there is visible dust,
remove it by means of a sofi brush
21
View
Front
Temperature alarm LED
LCD Display
Function keys
4 Main switch
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22
Rear view
Power supply socket
Monitor connector
RF Output connector
Telemeasuring socket
MONO Input connector
SCA1/SCA2 Input connectors
MPX IN/OUT Connectors
L and R Input connectors
23
24
This page is intentionally blank
Section 3 - Diagram
Contents:
— Cable diagram
- SCH0049AR3 (FM Transmitter board)
- PN41 7 (MPX Stereocoder board)
- PN396 (Display board)
- PN437/A (SW FM Amplifier)
- PN438/B (Directional coupler and Low Pass filter)
- PN4 10 (300W FM Amplifier module)
- PN515 (Power regulator)
— E0013 (SP500—27—DE2 Switching power supply)
— Appendix (Adjustment and tests)
25
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26
Component list A1870 - PLUGS-3
Part Name Code Description Qty
20656 TAV,1193R01POST. 250W TXFMZN 1
07541 PORTAFUS‘ 10A PAN'N‘ cod. P1820 1
02831 SPINAVDE 10A cod. PXSSO A28 1
A2010 BNCFEMM.AVTI'ONE(UGIO94) R141563161 3
02326 PRESAXLRS POLI ood‘ NICHSFPI 1
07935 TERMOSTATO 2455R 100 74 NC. 1
50013 ALIM, SWITCHING SP750048 1
SXH0049ARO SCHEDA PLLC PN295AR2 1
02518 R114082000PRESASMBxRG174 4
16006 SCI-[EDA DISPLAY PLIJCfA PN396 1
16017 SCI-[EDA ALIMEN, 200W FM PNS 15 1
07522 INTERRUTI'ORE LUM, cod. 14715 1
05865 PANNELLD PLL/C 100W TAV, 1050/A GRIGIO 1
07613 VENTOLA PAPST mod. 8414NH 2
0555213 KIT MANIGLIE 3-4U cod. 235,012 2
03060 LED VERDE DIAM. 5mm 1
0.7061 LED ROSSO I
08500 CAVORG174 500hm 1
07925 PROTEZIONE IN GOMMA PVC PG 075 1
07924 PROTEZIONE IN GOMMA PVC PG 328 I
03065 PORTALED 5mm INNESTO AVITE443,1613 2
06478 MODULO 250W PM A MOSFET 1
07602 GRIGLIE VH‘ITOLEmod. L2 221 2
00951A VAR] STORI 275V cod 232259552716 2
08502 CAVO RG316 500hm I
05526 LAT. 3U PROF. 360 TAV. 423/A R207] ZN 1
05505 PIANO PORT PROF. 360 TAV. 585 P2074 ZN 1
Z0657 TAV. 1194 LATER. SX 250W FM ZN 1
Z0658 TAV. 1192 BASE 250W FMZN 1
20659 TAV 1197 DISTANZ x250W FM MOSF. 1
V0760 TAPPI NERI O 915 PLASTICA DP—375 1
Z0840 TAV. 1 324 CHTUSURA CONNETI'ORI XLRZN 1
00342 RESISTENZARHS 10W 2200hmRS 159-944 2
27
28
This page is intentionally blank
FM TRANSMITTER BOARD SCH0049AR3
Component layout SCH0049AR3
mm
o ‘o \
mm mm
ms “A” -_§§§f
PMS ®
- mzo
m w® -5
mm a 2 @@5-
EMD cupum' or x mm ‘E Z
4.7p baevwen an
M9 coil on Q®E “D52
We ground Mu
CAZA, CAZ5 anus
Replace lhe 35 O
capacuar wrh <-® e-m a
a shorl clr w CAN “2.“ um um E
A35
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5 m sh rt crrcuw
3&2? LE 2
@ fill9 my ms
“ m m
w [RAJE
Ow
Add one m w,
4.7ur 16V 3 5552
exec». ca N
between Rp §© Ecezfia- m , Law
and gvuun 0 cm can R523 n
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“m m
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29
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2525
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EoN\E\E
OZ4ZUEE<4
323 5528
0203005 5
25646 uzGud mm IOkQ
Crosstalk W > 59dB @ 40Hz
> 70dB @ lkHz
> 53dB @ lskHz
Pilot Frequency Accuracy < le
Preemphasis 50ps l70ps/ FLAT
Weighted S/N ratio (400HZ) > 80dB
Unweighted S/N ratio (400Hz) > 81dB
Tl-lD 0.03%
IMD (7&8kHz) 0.013% (D2)
0.110% (D3)
Power Supply 15Vdc
34
STEREOCDDER Block Diagram
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For the operations described in this paragraph, referto th diagram SP417 at the followingpage;
SETTINGS
JPZ/JP4: Allows to select the preemphasis between 50 and 75us or to completely exclude it removing the jumper;
JPl/JPZ: Allows to select the inputn impedance between 600 and 30kQ;
J P5: Insert an auxiliary condenser needed to calibrate the crosstalk with the exciter connected;
JP6: Disables the carrier ofthe pilot;
J P7 : Allows to exchange the left and right channels with each other.
ADJUSTMENTS
R29; Allows to adjust the crosstalk L->R;
R28: Allows to adjust the crosstalk R->L;
C36: Allows to adjust the crosstalk;
C42: Allows to adjust the pilot frequency;
R27: Allows to adjust the pilot level (560mVpp);
R44/R36: Allows to adjust the peak level of the lefl/right channel;
R52/R7: Allows to adjust the input signal for the left/right channel;
LP4/LP3: Allows to adjust the passing band for the right channel;
LPZ/LP]: Allows to adjust the passing band for the lefl channel,
35
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R36.
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JP]
JPE
m Famalg Snug?
R29 Crosstalk L - R LP1-4 All inside (Adj. slart point)
R23 Crosstalk R - L (M) G-10kHZ Harness adj.
C36 Crosstalk JP1~JP3 Preemphasis (50-75us)
C42 Pilol lrequency JPZ-JP4 hput impedance (GOO-30k)
R27 Pilol level (SSOmVpp) JP5 Enable capacilor (or adi. wilh excite-r
R44 Rigli peak level JPB Disable Pilol frequency
R36 Lefl peak level JP7 hpms selector (RIL or HR)
R52 fight level 41 Camectm (enable, LIR peak level)
R7 Lefl level - _
36
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751,52 3 a 55
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57
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46
COMPONENT LIST pn43 7/A
REFER. TYPE
R1 2709 1/4W
R2 189 1/4W
R3 2709 1/4
R4 39kQ 1/4
R5 IOOkQ 1/4
R6 12kQ 1/4
R7 479 1/4W
C1 68pF
cz 150pF
C3 100nF
C4 100pF
C5 4,7I1F 63V
C6 100nF
C7 100pF
cs 220pF
C9 1.3pF
L1 VK200
[2 VKZW
TR] BLFZ42
PN437/A
DESCRIPTION
RESISTOR
RESISTOR
TRIMMER
TRIMMER
RESISTOR
RESISTOR
RESISTOR
SMD CAPACITOR
CERAMIC CAPACITOR
CAPACITOR TIPE ATC-100B
CERAMIC CAPACITOR
ELECTROLYTIC CAPACITOR
CERAMIC CAPACITOR
CERAMIC CAPACITOR
SMD CAPACITOR
MOSFET
PRINTED CIRCUIT BOARD
47
DIRECTTONAL COUPLER AND LEE PN438/B
DE SCRIPTION
The PN438/B contains two stages, the first stages is a directional coupler which measure the incident
and reflected RF signals
These signals are elaborated to be used by protection module for SWR and Power protection.
The second stage is a low-pass filter ehich removes the harmonics.
TECHNICAL CHARACTERISTICS
Relum Loss >= 30dB
Insertion Loss < 0,2dB
Attenuation at l76Ml-Iz > 40dB
Component layout PN438/B
REF
yNaaB/A
4B
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49
COMPONENT LIST pn438/B
REFER. TYPE DESCRIPTION
R] 1209 1/4W SMD RESISTOR
R2 1009 1/4W SMD RESISTOR
C] 27pF SEMCO CAPACITOR
C2 56pF SEMCO CERAMIC CAPACITOR
C3 68pF SEMCO CERAMIC CAPACITOR
C4 561313 SEMCO CERAMIC CAPACITOR
C5 27pF SEMCO CERAMIC CAPACITOR
C6 391317 CERAMIC CAPACITOR
C7 InF PHILIPS SMD CAPACITOR
C8 InF PHILIPS SMD CAPACITOR
C9 18pF CERAMIC CAPACITOR
DI BAT 83 DIODE
D2 BAT 83 DIODE
L1 4T, d=1mm, D=8mm
L2 4T, d=1mm, D=8mm
L3 4T, mm, D=8mm
L4 4T, d=1mm, D=8mm
PN438/A PRINTED CIRCUIT BOARD
50
300W AMPLIFIER MODULE PN410
DESCRIPTION
The module PN410 (06474 Elettronika Code) has been designed to amplify FM signals in the band 875 —
lO8MHz. It uses a Motorola MRFlS lG MOSFET allowing to obtain high gain without dangerous thermic
drifi phenomena
The module is wide-band and needs no calibration except for the stand-by current which is set in
factory to the nominal value, see technical characteristics, by means of the trimmer R6. The circuit is
provided with athennic sensor (R4) to stabilize the working point when the temperature of the device changes
TECHNICAL CHARACTERISTICS
Output power 300W CW
Frequency 87.5 — 108MHz
Gain: ZOdB i] ,0dB
Output impedance: 5 09
Input impedance: 5 09
Power supply: 50V
Bias current SQTIA
Current consumption 10A max
REPLACEMENT
The replacement of the RF module is very easy and is explained below:
- replace the broken module with a new one;
- make all solderings except the power supply one;
- connect a digital tester set to read the current with range F.S. 200mA;
— turn the R6 trimmer completely clockwise and turn the apparatus on;
- make sure that the amplifier is connected to a 509 dummy load and that there is no RF power in input;
- turn slowly the trimmer R6 clockwise until the display reads SOmA;
- turn the apparatus off and reset the power supply directly to the module;
- turn on the amplifier and check by means of a digital tester that the voltage on the gates is between
25V and 3 .0V.
51
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53
COMPONENT LIST pm” 0
REFER
R1
R2
R3
R4
R5
R6
R7
R8
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
T1
D 1
31
B2
33
L1
L2
L3
PCB
54
DESCRIPTION
100 1/2W RESISTOR
100 1/2W RESISTOR
33k!) 1/4W 1206 SMD RESISTOR
100kQ PHILIPS NTC
6.8kQ 1/4W 1206 SMD RESISTOR
100kQ MULTITURN TR] MMER
100kQ 1/4W 1206 SMD RESISTOR
3.3kQ 1/4W 1206 SMD RESISTOR
ATC 1003 331313 CAPACITOR or equiv,
470nF 100V MKT CAPACITOR
47nF 50V CERAMIC CAPACITOR
47nF 50V CERAMIC CAPACITOR
10nF 500V CERAMIC CAPACITOR
470nF 100V MKT CAPACITOR
47uF 100V ELECTROLYTIC CAPACITOR
470nF 100V MKT CAPACITOR
10nF 500V CERAMIC CAPACITOR
ATC 1003 470pF or squim
ATC 1003 470pF or equiv.
ATC 1003 470pF or equiv.
ATC 1003 470pF or equiv.
MRF] SIG Mowmla RF POWER TRANS,
or SD2932 RF POWER TRAS.
4004 DIODE
RF 9:1 balanced-unbalanced transformer
RF 4:1 balanced-balanced transformer
RF 1:1 balanced-unbalanced transformer
4 TURNS COIL
‘/z TURN COIL
RF CHOKE
Epoxy—Glass material
ELE’ITRON'IKA CODE
00127
00127
00059A
00661
00051A
00791
00065A
00047A
1127
1073A
1061
1061
1053
1073A
1791A
1073A
1053
1143
1143
1143
1143
3998
3938A
3006
5064
8523
8502
5043
5064
9410
POWER REGULATOR BOARD
PN515
Component layout PN515
ICE
EH
DESCRIPTION
50V DISCO COD. 1065 (Unmoumcd in I’LL/C and PLUGS-2)
50V DISCO COD. 1065
50V DISCO COD. 1065
50V DISCO COD. 1065
50V ELET. VERT. COD. 1795
50V ELET. VERT. COD. 1795
50V ELET. VERT. COD, 1795
63V ELET. VERT. COD. 1779
RES 1/4W 5% COD. 0019
RES 1/4W 5% COD. 0043
(Unmwnlcd in PLL/C and PLUCSVZ)
RES 1/4W 5% COD. 0033 (Unmwnlad in PLL/C and PLL/CS-Z)
RES 1/4W 5% COD, 0033 (Unmanned in PLL/C and PLL/CS»2)
RES 1/4W 5% COD. 0037
RESISTENZA A FIDO 2w 5% (Unmanned in PLL/C and PLL/CS-Z)
RES 1/4W 5% COD. 0049
15V 1A COD. 4325
STABILIZZATORE (Um-mum in PLL/C and PLUGS-2)
STABILIEATORE
PER PCB 2 PIN A PETTINE
PAD CIRCOLARE 2.54mm
COMPONENT LlSTpn5I5
REFER. TYPE
C1 IOOnF
C3 IOOnF
C6 100nF
C8 100nF
C2 IOOuF—SOV
C5 100uF—50V
C7 IOOuF—SOV
01 IMF-63V
R5 15R
R7 IKS
DI IN4007
D2 1N4007
D3 IN4007
R] 220R
R6 ZZOR
R4 470R
R3 3900 2W
R2 56000 1/4W
IC3 7815
ICI LM3l7-H
IC2 LM317—H
J2 PETTINE—PCB-Z
JI SGN CIRCLE
13—9
55
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SP5 00-2 7/48 S WITCHIN G POWER S UPPL Y
E0013
SPECIFICATION
MODEL
DC Output Voltage
Output Rated Current
Output Current Range
Ripple & Noise (p-p)
DC Output Power
Efficiency
DC Voltage Adjl
Over V. Protection
Input Voltage Range
Input Frequency
Power Factor
Overload Protection
Over Temp Protection
Fan Control
Working Temp, Humidity
Dimension
Weight
SP—500-27 (E0012 Code)
27Vdc
18A
0-18A
200mVp-p
486W
87%
24—30V
3lV—36.5V
88-264Vac
47-63Hz
0.95/1007240Vae
105%-l35%
Type: Foldback current limiting
Recovery: Auto
> =70°C Output Shutdown
Temp. > =60°C Fan On
< =50°C Fan Off
-]0°C/+50°C, 20%-90% RH
185x120x93
1.8Kg.
SP—500-48 (E0013 Code)
48Vdc
10A
0-1 0A
240mVp-p
480W
87%
41 -56V
57.6V—672V
57
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60
Adjustment and tests
Appendix
TEST PROCEDURE
The table below shows the typical technical characteristics of the board used as FM radio transmitter‘
The measures have been taken at 98MHz frequency
Power stpIy
15Vch400mA
RF own level
t25dBm (10.3dB)
RF Oulpul corneclorllmpedenzz
SMBI5OO
Attenuation with PLL
Audio Iinilalion circLit
>50dB
ONIOFF
Irpll impedance
6000 Balanced
Enpl'asis
FLAT/50usl75us
Frequency response
40Hz+15kHz (10.3dB)
Distortion
<0.1%
SIN Weighted CCI R
>7BdB
SIN Unweig‘rted CCIR
>81dB
AM Synchronous
<-68dB (<0,D4%)
AM Asynchronous
<-73dB (GBdB
SIN Unweigvted CCIR
>73dB
61
1. RF SECTION
Remove the ferrite core from the coil in the oscillator section and check that it is locked (green LED
lit) in all the working range (typically the tension on the varicap at 98MHz is 4.0V);
check the output level of the RF signal, typically 25dBm, in the concerned band (87+108MHZ);
adjust the indication of the direct and reflected power by means of the trimmers RCI and RC2,
2. MOTHER BOARD (Modulation/Limitation circuit)
62
Connect the oscilloscope on the middle point of the jumper JP3;
on the MONO input insert a lkHz tone with 2,2Vpp (OdBm@6OOQ)disable the emphasis (FLAT
response) by removing the two bridges from the jumper JP] and adjust the input attenuator RAS
until 648Vpp can be read on the oscilloscope;
check the intervention of the limitation circuit in case the input signal increases. Adjust its simmetry
by means of RA36;
adjust the frequency deviation to the normal levels (usually +/-75kHz) by means of RA44;
characterize the MONO and MPX input by measuring the passing band, distortion, emphasis curve
(50 and 75|.Ls) and noise;
adjust RBI to improve the distortion;
input SCA1-2. Adjust RA22 and RAZO to obtain a +/-75kHz deviation with input 2.2Vpp with a
S7kHz tone. Check the frequency response in the band 57+75kHz;
adjust the deviation indication on the display by means of RC244
MAIN CHARACTERISTICS OF THE FM TRANSMITTERS
Frequency band of the carrier amnion": emuaeMHx
ChameHing 1mm: 1mm;
Devlalion new: mm;
Fre-emphasis mus Euus
Variation of me power nus ma
compared lo the nomrnal value some (“l
Frequency tolerance
am: (anpm rel 111mm)
22kHz, drill inirvee monlhs (300141
Spurious emissions (Pn>25w) mac e <1 mw mask
Tompi 1 ' 5'c Temp. is’eao'c
Emvrormem conditions Tompi 5-«45'0 (57) Term. u~ee4n~c (an <')
Power sum lemme fln‘fa (6-7) Power supply lamp. -|0A+e% (6-7)
a mm: are devhllon mum m be
. . . . . browned by mu am we (skim
“m"a'm “m" fora we Increase 04 me audio ”a“
signer
Lw 55 filler mum ammonia-r bemoan ands anenuanon lo19kHL >3oaa
pa 181400th compared lo 15k“! beyond 19“ wmpared “315sz
Warm up 15 minutes millm zn mlmes minmwr
Audio lrequency band annmsknz AOHzA15kHz
Frequency response ms wmr sou: pro-emphasis ma con preenf. 50us
ausio input «mmsknx my «mom tTSka) AOHz~|5kH11a 115441)
Frequency response macs waxessm
MPX mpu 1rl nonun'rsmz)
Distortion <1=/. mumsmx (no do—ompluull) 5kHz also -6dB/oc13ve
M—S Crosslalk zasaa
firmed ezm, balanced, cerzaem
AF "w" omerence side (no emphasis)
WWW “m5 inved. zzm inseam-ea swskm
10.513 rel. 57m:
‘ The regulaliou prescribes the measure in compliance with lhe recommendation CCIR 4684: “ratio belween the effective value of a 400Hz
frequency signal causing a deviation of the can-ier of t7Skl-Iz and the value of lhe residual background noise measured with a quasi-peak
detector, weighled with a CCIR weigh! filter".
63
Jz
DISPLAY
coNNEcraR
15Vdc
POWER SUPPLY
wxo
FNE
FREQUENCY
m \
DIRECT
POWER INPUT
cm
IRECT
DWER moms
Ru
REFLECTED
POWER READING
Rm
vumom
READING
erREo
CODER
CONNECTOR
LIMITATION
ochurr
BF LIMITATION
cRculr
SIMMETRY
DEVIATION
Mouuumou
PLLIC - Cali!
®m
agf
Mausm
MPX
/ mm.” LEVEL
/M;
; scm
|m>u1 LEVEL
scAz
/ INPU1 LEVEL
— MONO
man LEVEL
was
BALANCED
MONO man
J»
magma
CONNECTOR
REFLECTED
POWER INPUT
RF ouww
ooNNEcmR
rm
VARICAP
POLARIZATION

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