User's Manual

1-2
1.2.1 Transceiver Module
The Single Channel Transceiver is based on Transceiver Model 90-6R/8.33. The transceiver
module is a low power VHF/AM transceiver which can transmit or receive on independent, pre-
programmable synthesized frequencies, with 25kHz or 8.33kHz channel spacing in the
frequency range 118.000 MHz to 138.000 MHz. The operating frequency can be easily
programmed using a PC via the front panel mounted serial DB-9 connector.
1.2.2 Power Supply Module - P/N 043603-1
The Power Supply Modules provide the DC supply voltage to the transceiver and linear
amplifier, and houses a battery charger which can provide charging and trickle charging to
external rechargeable batteries. The external DC supply must consist of both 48Vdc and
12Vdc external batteries. The power supply will accept an input supply voltage between 110-
240VAC and will autorange.
1.2.3 RF Amplifier Modules - P/N 043604-1
The RF Amplifier (Model PA-50) modules provide 50 Watts of power output. The RF Amplifier
is fed by the 7 Watt RF output from the transceiver module. An internally mounted RF Relay
bypasses the RF Amplifier when in receive mode. The output of the amplifier can vary from
25-50 watts by adjusting the transceiver module RF output between 2-7 watts.
1.2.4 Mother Board, P/N 033588-1
Mother Board, p/n 033588-1 is supplied with the two available remote control cards and
supports both a 25 pin “D” and 9 pin Positronics remote connectors on the back of the
transceiver chassis. A RJ11 style connector is also provided which supports only 2-wire audio
signals. The Mother Board provides all interconnection between the three external remote
control connectors, RF Amplifier Module, Power Supply, Remote Control Board, and
Transceiver. The Remote Control Boards, RF Isolator and all internal fuses are mounted on the
Mother Board.
1.2.5 Remote Control Boards
1. Line Interface Board P/N 923051-1
Provides remote control transceiver operation on 2 wire or 4 wire 600 ohm lines. This board
can be configured to key the transmitter using a 2175 Hz* continuous tone (see below),
plus/minus DC Voltages, ground keying and internal or external DC (15 mA) current loop
keying. Transmit and Receive audio is user selectable for two wires or four wires. *Crystals
for tone frequencies other than 2175 Hz may be obtained by special order (ie/2380 Hz).