Instruction Manual

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3.7.4 Front Panel Back Lighting
Front panel back lighting connection should be made on pin 3 of the transceiver. The opposite
end of this lead should be connected to the panel lighting system of the aircraft. Before
connecting, verify the required panel lighting voltage (28 VDC or 5VAC) on the transceiver
configuration control label.
3.7.5 Audio Outputs (600 ohms and 4 0hms)
The audio output from pin 9 can be used to drive a 4 ohm speaker up to 2.5 watts. Audio
output from pin 1 is 600 ohms, 0.5 watts maximum.
3.7.6 Audio Output Ground
Pin 10 is the ground for both the 4ohm and 600 ohm audio output signals on pins 9 and 1.
3.7.7 Mic Signal Input
The microphone input signal is to be provided on pin 6, utilizing shielded wire with the shield
grounded to pin 10.
3.7.8 Memory Up/Memory Down
Remote scrolling through the 150 memory positions can be achieved by providing a ground to
pins 4 (up) and 5 (down) through a momentary contact cyclic switch.
3.7.9 Data Input
Channel data may be transferred to and from the unit using RS-232 communications protocol via
pins 2 and 11.