MRMap Development Team 10/01/2009
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. They can also provide 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 used to
ensure the radio switches on when there
is no control head and therefore no other
indication of this having happened.
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