Sommerkamp TS-732P User manual

CITIZENS BAND
TRANSCEIVER
5 WATT 3g CHANNEL
INSTRUCTION MANUAL
M ODEL T S -7 3 2 P

CONTROL LOCATIONS:
P.T.T. BUTTON- -MICROPHONE
MOUNTING
8RACKET
VOLUME
CONTROL
SQUELCH
CONTROL
. AN L SW.
RF/S
METER
TRANSMIT
INDICATION LAMP
C ALL BUTTON
■POWER SWITCH
CROPHONE JACK
ANTENNA
CONNECTOR
PACKING LIST:
Beside this manuał, the carton shall contain the following items:
1 Transceiver TS-732P
1 Mounting bracket
4 Screw for Mounting bracket
1 Microphon hanger
1 AC cord with 8 pin connector
1 DC cord with Fuse holder and 8 pin connector
1 Microphone
2 —

GENERAL DESCRIPTION
Your SOMMERKAMP TS-732P transceiver has been désignée! for continous heavy
duty mobile and base Station application. It can be operated with a microphone
and internal speaker or headset, speaker/ microphone combination, telephoneset
incorporating automatic voice operated transmit/receive Switching, external sélective
calling with automatic answerback and many more.
GENERAL:
The transceiver is designed to operate from either 110/220 Volt AC or 12 Volt
DC powersupply as a base or mobile station. Its straight forward 32 channel
capabifity allows it to operate on any combination of frequencies within 26 5 and
29.7 MHz by inserting the corresponding xtals and retuning the transceiver if
required. The Xtals in the transceiver are standard 27 MHz CB Xtals with plus
or minus 455 KHz receiver offset. No special synthesiser or IF Xtals are required.
RECEIVER SECTION
The receiver section is designed to receive amplitude modulated (AM/A3) signais
in the 26.965 to 27.275 MHz. (11 meter) citizens band. The unique combination
of low noise Field Effect Transistors (FET), single conversion, a combination
of mechanical ceramic, and L/C filters, fully automatic noise limiter and a hifi
quality speaker amplifier will give you exceptional réception quality in this
fine piece of equipment.
In addition, the above combination of the latest technology provides you with
a sensitivity and unwanted signal rejection and noise suppression available
previously only in space and military communication equipment.
The power supply of the receiver RF. IF and oscillator section is stabilized by an
extreme Sharp cut-off Zener diode to obtain the high sensitivity and unwanted signal
rejection. The fully automatic sériés gâte noise limiter, which virtually cuts off
the audio output during ignition noise puises, is defeatable to make even the
weakest signal audible which otherwise would be eut off by the threshold level of
the ANL switching diode.
The high squelch sensitivity is ac.hieved by using a separate squelch detector and
switching circuit with a carefully balanced hystérésis. The transformerless hifi
quality audio power amplifier will drive any load between 8 ohms and indefininite
such as internai speaker or externai speaker/microphone or headset combinations
having the above impédances.
The meter indicates the field strength during réception of a signal.
3

TRANSMITTER & MODULATOR SECTION:
The transmitter section is designed for continous heavy duty transmission of
amplitude modulated (AM/A3) signais in the 26.965 to 27.275 MHz. (11 meter)
citizens band.
The transmitter consists of crystal controlled osciilator. The output of this osci-
llator is amplified in a dass A buffer followed by a tuned filter, and a highly
efficient collector-modulated dass C driver and power output stage, coupled by
séries and pi-matching filters to the antenna jack.
The modulator consists of an input audio filter, integrated pre-and power amplifier
and modulation transformer. This gives you the lowest possible modulation
distortion and up to 100% modulation. The input is designed for 500 to 10K ohm
dynamie microphone or 8 ohm speaker/microphone combination with a 1K ohm
resistor in sériés.
RECEIVE/TRANSMIT SWITCHING:
The receive/transmit switching is done by a single pole, single throw switch in the
microphone and a combination of NPN and PNP switching transistors.
METER:
The combination meter provides you with the following functions:
During receive mode ....... it indicates the incoming signal strength.
During transmit mode--it indicates the output powerr.
AC POWERSUPPLY
The AC powersupply consists of the heavy duty power transformer, a 4 diode füll
wave bridge rectifiers and a heavy duty voltage stabiliser for 13. 5 Volt for the
receiver and transmitter sections.
DC POWERSUPPLY
This transceiver is designed to operate only from a 12V. DC negative grounded
powersupply.
4 —

BASE STATION INSTALLATION AND CHECKOUT
Unpack the transceiver carefully and check for exterior damages and the access-
ories.
Connect the 3 wire AC cord to an AC plug in the following manner:
1. blue to AC terminal
2. brown to AC terminal
3. yellow/green to the earth terminal
Connect the antenna plug to the antenna jack with an SWR-Meter inserted into
the antenna cable.
Connect the microphone to the microphone jack.
Place the transceiver in operating position and connect the AC plug to a 220 Volt
50 Hz AC output.
Check very carefully that nothing touches the backpanel and that there is a min.
10 cm space between the backpanel and any object nearby because the transmitting
transistors will heat up to 100 degree Centigrade and carry a voltage of 14 Volt
DC and high power RF.
Switch the transceiver ON.
The receiving, meter and the channel lamp shall light up.
Turn the Squelch control to min. (ANL OFF)
Turn the Volume control to max. until you hear a rushing sound from the speaker.
Switch the channelselector to CH 1.
Push the transmit button on the microphone and check with the SWR-Meter
immediately the SWR of your antenna. The SWR must be less than 1 to 2. Do
this within 3 seconds, because if the SWR is higher than 1 to 2 it is very likely
that the transmitting transistors will be demaged if you operate thé transmitter
too long with a antenna having a too high SWR. Also read carefully the
recommendations on antennas.
If the SWR is less than 1 to 2 continue installation. If it is more than 1 to 2
repair or replace your antenna.
Check that the meter needle is near the red mark during transmitting.
Talk into the microphone. The meter needle shall move a little.
Release the transmit button and switch the channelselector to channel 1, 2 ectr,
until you receive a station.
Wait until this station stops to transmit and turn the Squelch control slowly to
max. until the background noise just disappears. When the station starts to
transmit again, you will hear this station, but you will not hear the background
noise during non transmitting periods.
5

Mounting bracket and screws are supplied for mounting the transceiver underneath
the dashboard. Microphone hanger and screws are also supplied.
For electrica! connection, first make sure that the transceiver is turned off.
Connect the red wire to the ACC terminal of the ignition switch or + terminal
of battery and ground the red and white or black wire to the chassis of the
vehicle. The black wire should be grounded as short as possible to minimize noise
interférence.
This transceiver is designed for use with the negative ground system.
OPERATING INSTRUCTIONS
The transceiver is ready to operate when it is installed with an antenna properly
connected. Note that the communication range differs depending upon the environ
ment where the transceiver is operated. You may reach 30 or 40 kilometers
where no obstacle exists, but the range may be limited to 5 or 6 kilometers in
cities where many high buildings disturb the communication.
1) Turn the set on by switching the ON-OFF snap switch to ON and the channel
dial will be lighted. Turn the volume contro! clockwise to increase the audio
Sound. Note that the volume controi knob is only for adjusting the audio
volume, not to increase the transmitting power.
2) Turn the squelch controi clockwise until incoming noise is eliminated. Do not
turn it excessively as the sensitivity may be reduced.
3) Turn the squelch controi counter-clockwise to switch off the ANL
(Automatic Noise Limiter)
4) Turn the channel selector knob to the desired channel.
5) For transmitting, press the button on the microphone and speak into it normally.
Release the button for receiving.
METER
The meter reading indicates the signal strength at receiving, and functions as an
output indicator at transmitting, and the meter pointer should be within the Red
zone under the normal conditions.
MOBILE INSTALLATION
6

MICROPHONE JACK
The 7-pin DIN standard accessory jack has the following internai connections:
1. Microphone input(Z 600-10K ohm) 5. Audio output (Z 8 ohm-10K ohm)
2. Transmit/Receive switching. 6. +12V for VOX unit etc.
3. Internai microphone output (Z 1K ohm) 7. Ground return for 1-6.
4. Internai speaker (Z 8 ohm)
Always operate the transceiver with the microphone plug inserted in the microphone
jack, or with the following external connections:
I. Microphone with VOX. 2. Headset or Teiephoneset with PTT.
3. External microphone 4. Headset or Telephoneset with VOX
O, 2 4'H
?3 lc\
0 7 60
□
=Ф
Microphon
600~10k ohm
5. External microphone/speaker with PTT. 6. Internai connection
7

ОВ.Ч (S247J
SCHEMATIC DIAGRAM

MAIN PARTS LAYOUT
U ü LT

PRINTED CIRCUIT BOARD PARTS LAYOUT
п

WIRING LAYOUT
12

BLOCK DIAGRAM
AGC

PARTS LIST for T S -732P
DESIGNATION PARTS NAME PARTS NO.
MP-301 Front Frame 483014-732
MP-302 Chassis Frame 482009-732
M P -105 Cabinet Cover (Upper) 483016
МР-150 Cabinet Cover (Lower) 493040
M P -107 Mounting Bracket 484085
МР-303 Front plate (L) 494187-L
МР-350 Front plate (R) 494258
МР-351 Brand plate 494257
МР-352 Back plate 494253
МР-110 Mounting Bracket for Meter 484064
МР-208 Mounting Bracket for Transformer 484080
МР-353 Heatsink for 2SC123T (A) 494251
МР-354 Heatsink for 2SC1237 (B) 494252
МР-211 Meter Lamp Reflection plate 484063
МР-212 Channel Indicator Screen 484107
МР-214 Mounting Bracket for Channel Lamp 484108
МР-111 Call Sw itch Contact 484086
М Р -112 Call sw ith Spring 484087
М Р -117 Knob for Channel Selector 484116
М Р-17 Knob for Vol./Squ. Control 474011
М Р -118 Nut for Channel Selector 484073
М Р -120 Screw for Mounting Bracket 484098
МР-355 Channel Indicator plate 484115
М Р-309 Heatsink for TA7205P 494254
МР-356 Heatsink for 2SC495 494250
МР-357 Model No. Indication plate 494256
МР-20 Lamp Lens (Red) M40024R
ЛEXT. SP. Jack S J-296
J2 Antenna Jack MRM/INCH
J3 Microphone Jack DIN Type 7P CS 279
J4 Power Connector US Type S -10507 # 1
ЕР-501 DC Power Cord with US Type Plug Fuse holder W-732DC
ЕР-502 AC Power Cord W- 732AC
F1 Fuse ЗА F-ЗА
МMeter D33B35R
SP Speaker SP- 70- 8
PL Pilot Lamp 14V-80mA P L -14-80
SW1 Channel Selector Rotary Switch S32C4232
SW2 Power Toggle Sw itch 8A-2011
MIC Microphone 12-31019
ЕР-503 C rystal Socket 12P XS-12P
ЕР-504 C rystal Socket 10P XS-10P
ЕР-505 Crystal Socket 6P XS-6P
IC-1 Integrated C ircuit лгРС5Т5С2
— и

PARTS LIST for TS-732P
DESIGNATION PARTS NAME PARTS NO.
IC - 2 Integrated C ircuit TA7120P
IC -3 Integrated Circuit TA7205P
TR I, 2 FET 3SK40
TR3,4,5,6,9 Transistor 2SC1739- P
TR8 Transistor 2SC1739-Q
TR13, 16 Transistor 2SC496- Y
TRIO T ransistor 2SC496- 0
TR12 Transistor 2SC1237
TR 7, 15 Transistor 2SC1741- Q
TR17 Transistor 2SB435
TR 14 Transistor - 2SD235
TR11 Transistor 2SC495- T
D 8 -1 6 Silicon Diode ISZ473
D l ~ 7 Silicon Diode IN4002
D18, 19 Zener Diode WZ 090
D20 Zener Diode WZ 070
LI RX Antenna Coil 4Z156
L2 RX RF Tuning Coil (27 MHZ) 4Z156
L3 RX Mixer Coil (27 MHZ) 4Z171
L4 RX Mixer Coil (455 KHZ) 4Z165
L5 1. F. T. (455 KHZ) 4Z168
L6 1. F. T, (455 KHZ) 4Z1371
L7 RX Local osc Coil 4Z170
L8 TX OSC Coil 087-907
L9 TX Driver Tuning Coil 005-905
L10, 13 RFC (л- Match circuit) 010-907
L ll TX Power Drive Tuning Coil 005-906
L12 RFC (Power Driver) 005-903
L14 TX Power Tuning Coil 005-907
L15 TX л Match Coil 005-908
L16 TX n Match Antenna Loading Coil 005-909
L17 TX 54 MHZ Trap Coil 005-901
T I Power Transform er E l-5702
T2 Modulation Transform er E l-4501
T3 Power Choke Transform er E l-2501
CF Ceram ic Filter CFU-455H
E P -506 P. C. Board 73201
VR1 Semi Variable Resistor 100K ohm /?^- SVR100K- 3H
VR2 Semi Variable Resistor 10K o h m r t * e f * / ł+ , SVR010K-3K
VR$ ¥ Semi Variable Resistor 5K o h m lSVR005K- 3V
VR6 Semi Variable Resistor 5K ohm $ - SVR005K-2V
VR5 Semi Variable Resistor 1K ohm ftÇ ff л /. SVR001K- 2V
VR7 Variable Resistor (Squelch)lOK ohm В 1 VR1610KBS
VR8 Variable Resistor (Volume) 50K ohm В VR1650KB
15

SPECIFIAT IONS or TS-732P
Semiconductors : 2 FET, 15 transis-tor, 20 diode.
Transmitter System: Crystal controlled.
Collector modulation ÀM.
Frequency : 32 channels on 27 MHz.
Input Power: 10 watts.
Band Width: 8 KHz (max).
Antenna Inpedance: 50-52 ohms.
Receiver System: Single conversion superheterodyne
crysfal controlled.
Sensitivity : 1/zV or. setter for lOOmW output,
lOdB signal to noise ratio.
Intermediate Frequency: 455 KHz
Receiver Selectivity: 25 dB dc ; at 10 KHz.
Squelch Sensitivity: 2 ... •
Audio Output Power: 2 watts in 10% distortion.
Power Source: 110V AC or 220V AC
11 — 16 .volt O.C. Negative Ground.
Fuse : AC: IA ' DC: ЗА
Microphone : Dynamic type Inpedance 500 ohm
with press-talk switch.
Speaker : Dynamic type voice coil inpedane 8 ohm.
Siz e : 156X58X205 mm
Weight: 2.3 kg
Accessories : Mounting bracket, Mounting hard wäre
AC and DC power cord, Microphon hanger.
SO MME RK A. MP ELECTRONÎC SAS
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СН-ВЭОЗ LUGANO, RO. BOX 176
SWITZERLAND
TEL. 91 6B8543 TELEX: 79314