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
Sea Air & Land Communications Ltd.
Page 2
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
3 times 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.
Audio from Tx Audio 1 (Pin 3, S1) is attenuated by the preset control R122v and
amplified by 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.
