Salcom TR160 Instruction Manual

TR160
DATA TRANSCEIVER
USER'S
HANDBOOK
SEA AIR & LAND COMMUNICATIONS LTD, 120 ST. ASAPH STREET, PO BOX 22-621, CHRISTCHURCH, NZ
SALCOM TR160 DATA TRANSCEIVER 10-95-0000 USER'S HANDBOOK - ISSUE 10950000UA
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SALCOM TR160
DATA TRANSCEIVER
DESCRIPTION
The TR160 is a VHF 500mW narrow band FM transmitter and receiver with
receive/transmit change over circuitry including aerial switching. It is intended for use
as an outstation telemetry transceiver for the VHF Telemetry Band C on 160MHz with
25kHz channel spacing.
TRANSMITTER
The transmitter consists of a 50MHz Colpitts oscillator incorporating a varicap diode
for direct FM modulation. The oscillator output circuitry, L103 and L104 are tuned to
3times the oscillator frequency and couple to the base of the amplifier Q103. Q104
and Q105 further amplify the 160MHz signal and the 500mW output is fed via a two
stage low pass filter to the aerial connection.
Audiofrom Tx Audio 1 (Pin 3, S1) is attenuated by the preset control R122v and
amplifiedby IC101 which also tailors the frequency response to the required
bandpass. The stabilised output voltage and the superimposed modulation are
applied to D102, the modulator diode. Tx Audio 2 (Pin 13, S1) provides a high
sensitivity audio input. IC102 amplifies and compresses the signal to give constant
transmitter deviation with inputs ranging from 5mV to 5V RMS. R123v provides
adjustment for the transmitter deviation.
Transmission is initiated by pulling PTT low, turning Q10 (transmitter supply) on and
Q12 (receiver supply) off.
TRANSMITTER SPECIFICATIONS
Frequency Band .... 150-165MHz
Type of Emission .... FM, 25kHz chan spacing
Power Output .... 500mW max. @ 13.5V
Spurious Emissions .... -26dBm max.
Power Consumption .... Transmit: 13.5V, 190mA
Modulation .... Deviation: ±4kHz max
Sensitivity: Tx1 50mV=±4kHz dev
Tx2 5mV-5V=±4kHz dev
Passband: 100Hz-3kHz
Crystal .... Fxtal = Ftx ¸ 3
Spec: HyQ GG13S, Rakon DEP00
RECEIVER
Signal passes via an input bandpass filter to Q1 RF amplifier, then via a 3 stage
bandpass filter to the base of the mixer.
The Colpitts series mode oscillator triples in its collector circuit, is filtered by a tuned
circuit and fed as injection to the base of the mixer Q2 along with the rf signal.

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Mixer output passes through a 10.7MHz crystal filter to a 2 stage discrete amplifier600OOPTION
andthen to the input of IC1. The 10.7MHz signal is converted to .455MHz in an
internal mixer which uses a 11.155MHz crystal X2 for its injection.
Signal emerges, is filtered by CF1 .455MHz, and further amplified within IC1 before
being detected by quad coil L7.
Audio output from pin 9 IC1 is fed via R41v to an internal op amp configured as a
noise amplifier, amplifying frequencies above 3kHz and then rectified and amplified
by Q7.
The dc voltage at Q7 collector which changes as the RF signal increases, is applied
to the internal squelch dc amplifier with hysteresis, the output of which drives
squelch switch Q6.
Pin 13, IC1 goes high with signal, turning Q8 and D3 on producing a low on the
BUSY output S1, pin 7. Reverse the busy output phase by cutting the pcb link at
"Busy" and linking to "+".
Audio output from pin 9 IC1 also passes via an LP filter R40, C43, level control
R40V, squelch switch Q6, through audio amp IC3, and to pin 2 on S1 as a 600O
unbalanced output. Link the pads at "Audio" for an 8Ooutput. Test the audio output
from the PCB stake at "Audio". IC2 regulates the receiver voltage to 8V.
RECEIVER SPECIFICATIONS
Frequency Bands .... 150-165MHz
Type .... FM dual conversion 10.7/.455MHz
Sensitivity .... -117dBm min for 12dB SINAD.
Selectivity .... 65dB min., ±25kHz
Spurious Responses .... 65dB min.
Blocking .... 84dB min @ ± 200kHz
Intermodulation .... 50dB min 2 generator test
IF Bandwidth .... ± 7.5kHz
Squelch .... Adj. to unmute 6dB - 20dB sinad
Audio Outputs Test O/P .... 500mW max, 8Omonitor O/P.
Pin 2 S1 .... 6V p-p max, 600Ounbalanced
500mW / 8Owith link.
Pins 11,12 .... 600Obalanced option 250Hz-4kHz
Power Requirements .... 13.5V, 25mA squelched.
200mA full audio / 8O.
Crystal .... Fxtal = (Frec - 10.7) ¸3
Xtal type = TE1, HyQ GG05S
Rakon DDD00
T/R CHANGEOVER
On receive Q12 is turned on providing supply to the receiver and when PTT is pulled
low, Q10 and Q11 turn on. Q11 starves Q12 depriving the receiver of supply while
Q10 supplies the transmitter with power. On receive D1 and D101 are turned off,
allowing aerial input to the receiver while on transmit D1 and D101 are on, allowing
transmitter power to the aerial.
SALCOM TR160 DATA TRANSCEIVER 10-95-0000 USER'S HANDBOOK - ISSUE 10950000UA
600 Ohm In/Out Transformer. Provision has been made on the PCB for a
transformer which is obtainable from Salcom either as a retrofit or can be included
in new units if requested. Join pins 2 and 3 on S1 and use pins 11 and 12 as the 600
Ohm Input/Output port.
TRANSMITTER TUNING INSTRUCTIONS
1. Install the correct crystal.
2. Connect the transmitter via a coax lead to a 50Oload
3. Connect the unit to a +13.5V power supply
4. Liven up the transmitter by grounding PTT connection, pin 5 on S1
5. Using an EVM with a 100KOisolation resistor on the probe tip, check Q101
base and emitter voltage to ensure oscillation. The voltage difference should
be in the region of 0.4V
6. With the probe on Q103 emitter tune L103 & L104 for a peak
7. With the probe on Q104 base tune for a peak negative voltage
8. With the probe on Q105 base tune L106 for a peak negative voltage
9. Tune L108 for maximum power which should be 400-500mW. If not, adjust
R115 for the desired result, a lower value will increase the power output
10. Adjust L101 to give the correct transmitter frequency
11. Connect an audio generator to Tx Audio (pin 3, S1) and adjust to give 100mV
RMS, 1000Hz at its output. Adjust R122v to give ±4kHz deviation and view the
demodulated output on an oscilloscope. There should be no appreciable
distortion although a small amount of second harmonic will be generated and
is tolerable.
TYPICAL VOLTAGES
Not oscillating Oscillating
Q101 Emitter 1.75V 1.9V
Base 2.5V 2.1V
Q102 Emitter 10.75V 8.3V
Base 10.0V 9.7V
Q103 Emitter 3.0V 2.95V (peaks)
Base 3.7V 3.55V
Q104 Base 0V -0.1V (dips)
Q105 Base 0V -0.2V (dips)
Q10 Emitter 12.7V
Base 12.0V
Collector 12.6V
Input Voltage 13.5V
IC102 Pins 1, 2 & 3 6.5V
RECEIVER TUNING INSTRUCTIONS
1. Install the correct crystal. F.xtal = (Fsignal - 10.7) ÷ 3.
2. Rotate R41v fully anticlockwise to disable the squelch.
3. With the unit connected to a 8Ospeaker/sinad meter and a signal generator
tuned to the receiver frequency, turn on the supply voltage.

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4. Adjust the oscillator frequency with L8 by zero beating with a 10.7MHz marker (3) Comms Socket S1:
injected around Q3. Pin 1. Earth Connection
5. With the receiver well into quieting, adjust L6 and L7 for minimum sinewavePin 2. Receiver Audio Output, 600Ounbalanced. Optionally, link pads at
distortion and maximum audio output. "Audio" for 8Ounbalanced output. Output level adjustment via R40v.
6. Adjust L1, L2, L3, L4, L5, L9 for best sensitivity, while progressively reducing thePin 3. Tx Audio 1. Has no compressor and is intended for fixed level signalling
signal input. Sensitivity -117dBm or better for 12dB sinad. inputs such as a tone encoder or modem. Set the Tx deviation to ±4.0kHz max.
7. Audio output 2V RMS/8O(500mW) max at "Test Audio Opt". by adjustment of R123v at any of the modulating frequencies using the modem
8. Rx Audio output 6V p-p max at pin 2 of S1, or between pins 13 and 14 if T1 is idle tone or tone encoder `slow encode' mode. NOTE: Transmit deviation
fitted. must be set correctly as over-deviation generates interference on
9. Adjust R41v for the required squelch level, typically -117dBm. adjacent channels. Max. sensitivity = 50mV.
SENSITIVITIES Source current approx. 5mA.
Tested with a 4n7 coupling capacitor connected to the appropriate test point.
Aerial Signal freq -117dBm, -118dBm typ.
Q2 Base Signal freq -113dBm (L4,L5 tuned for best sens)
10.7MHz -119dBm
Q3 Base 10.7MHz -115dBm
IC1 pin 16 10.7MHz -97dBm
455KHz -91dBm
IC1 pin 5 455KHz -61dBm
TEST VOLTAGES
Injection Chain Oscillating Not oscillating
Q5 Base 1.2V 1.27V
Emitter 0.8V 0.55V
Q2 Base 0.85V 0.90V
Squelch Circuit Squelched,no signal -100dBm RF signal
Q6 Base 1.2V 1.27V
Collector 0V 6V
Q7 Base 0.5V 0.6V
Collector 1.5V 0.05V
Regulator
IC2 8v
INSTALLATION: Connections
(1) AerialSocket S2: Connects to a BNC plug terminated via 50Ocoax to a
quarter wave dipole or multi-element yagi.
(2) Power Plug P1: Connects to + and -13.5v. The positive connection is nearest
to the D15 Communications Socket.
SALCOM TR160 DATA TRANSCEIVER 10-95-0000 USER'S HANDBOOK - ISSUE 10950000UA
Pin 4. No connection
Pin 5. PTT. Grounding pin 5 initiates a transmission and disables the receiver.
Pin 6. No connection
Pin7. Busy, driven from Squelch circuit, 0-10v. Set to go 'low' on squelch
opening, but can be reversed by cutting topside track link at `Busy' and
bridging to '+'.
Pin 8. Positive Supply Output.
Pin 9,10. No connection
Pins 11,12. 600Obalanced Input/Output when T1 fitted (on request). Link Tx
Audio 1 and Rx Audio together. Transmitter deviation is adjusted to ±4.0kHz
max. via R123v. (See section titled "Pin 3. Tx Audio 1" above.)
Pin 13. Tx Audio 2. Modulator input 5mV - 5V input level. Using R123v, ensure
tx deviation does not exceed ±4.0kHz at any input level & any modulating
frequency 300Hz-3kHz.
Pin 14. No connection
Pin 15. No connection.
MOUNTING
Mount the case using the two holes provided in the base and clip the TR160 PCB
into position on the lid.
DISCLAIMER
All information provided in this document is carefully prepared and offered in good
faith as a guide in the installation, use and servicing of our products. Installers must
ensure that the final installation operates satisfactorily within the relevant regulatory
requirements. We accept no responsibility for incorrect installation. We reserve the
right to change products, specifications, and installation data at any time, without
notice.
WARRANTY
Our Products are warranted for a period of 12 months from date of purchase against
faulty materials and workmanship. Should any fault occur the unit should be
returned to the Vendor, freight pre-paid. Please include a brief description of the
fault to assist with prompt return. Any unauthorized alterations or repairs will
invalidate the warranty.

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TR160 COMPONENT LAYOUT