MRMap Development Team 10/01/2009
Of critical importance are the ‘Data Volume’ which must be set at 15 and the selection of
‘Telemetry Output’
‘Data Volume’ sets the audio signal level on pin 15 of the rear facility (power) connector and is
the volume of the signal sent to the transmitting radio. A level of 15 causes no distortion of the
FFSK data whereas larger values can and lower values just reduce the audio volume.
Setting ‘Telemetry Output’ results in flat audio being used by the rebroadcast radios. That is no
pre-emphasis or de-emphasis or other audio processing is applied to the received or transmitted
signals. This runs the least risk of distorting the FFSK as it passes through the rebroadcast ra-
dios. Note however that setting this value causes the speakers to be disconnected from the ra-
dios and no audio is heard if they are left plugged in. This is as you would expect from a stand-
alone rebroadcast but seriously messes things up if you use the TWC radio for normal comms as
you can’t now hear anything from it. This system is probably best used by teams who have fixed-
site rebroadcast setups and teams who use the three-radio configuration in their vehicles. Two for
rebroadcast and the third to handle the normal vehicle comms. .
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