MRMap Development Team 10/01/2009
This is the page on which, again, a number of mistakes were made in earlier attempts at this. The
radios are programmed as a base using the values shown in the ‘Data Addresses’ box. These
are also the factory default values that will be found in a new radio. With these values, the TWC
radio can also act as a GPS base radio if connected to a laptop running MRMap. However, as it
doesn’t have a unique callsign, it can’t be used to send position reports back to base.
No values are set in the ‘Options’ box but especially the ‘Mute speaker during FFSK’ should
never be set in a rebroadcast or repeater unit as this prevents FFSK from being passed through
the device. With the ‘FFSK’ values, a discussion with the engineers at Simoco Huntingdon
resolved some logical issues that had been causing difficulties. Again the FFSK Data Rate
remains at 1200 baud.
In the case of rebroadcasters or repeaters, there’s no advantage in getting them to hold off if the
channel is in use as chances are, any other signals will be going through the device anyway.
There’s no need to set a lead-in delay for FFSK in a repeater or rebroadcaster as they aren’t
being required to generate any FFSK data themselves, only to pass through any data that they
receive. Because of this there’s no need for the ‘Use LID for FFSK ANI’.
Again, ‘Data CTCSS’ must be set at ‘Undefined’ which means no CTCSS tone is sent when the
data is transmitted. This is the critical config value that makes it all work.
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