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Normally associated with power and loudspeaker connections, the 15 pin D connector
can also provide audio in and out plus two programmable pins, one, an input and the
other an output. These can be programmed to go either logic high or low when certain
conditions arise. These two pins can be programmed to facilitate a cross-connected
PTT arrangement where one radio receiving a signal forces the other to go to transmit
and with cross-connected audio lines, anything received on one radio is re-transmitted
via the second.
The circuit on the following page shows how this can be achieved.
This group of 4 connections
are used to provide the facility
connector rebroadcast
function
The pin 3, ignition sense contact
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