MRMap Development Team 10/01/2009
Programming of the TWC side of the rebroadcast unit is the same for the 147.35MHz radio but for
the actual frequency used. The need to use a diplexer with an in-band rebroadcast device means
that it’s not really much use in programming any other frequencies in but this has the advantage
of there being no danger of popping up on the wrong channel as there’s no control head to tell
you you’ve done this.
On the ‘Channel <> Options’ page the most
important setting is the ‘Repeater Tail’. This is
the amount of time that the repeater remains in
transmit mode after the station calling in has
released it’s PTT. Although this is 600ms, just
over half a minute, this is a life-time in the nor-
mal course of events for these radios. Even
shifting the time by 50 milliseconds has a pro-
found effect and 600ms was the time found to
work most reliable. In fact 100% reliably in
tests. It might be possible to shorted it however.
I’ve used ‘Reverse Tone Burst’ as this re-
moves the squelch tail, the shhhssssss on the
end of each transmission as the various mute
gates close. This results in a received signal
that is much cleaner and does far less ear
bashing than it usually does.
I run at 1 watt RF power when testing which is
why the power levels look a bit strange.
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