MRMap Development Team 10/01/2009
Appendices
Remote Channel Changing in cross-band rebroadcast systems:
The basic rebroadcast functions are now provided by the crossover connections fitted to the rear
power/facility plug. The standard Simoco crossover lead is not required for plain, single channel
rebroadcast. However if you have a system on which you need to be able to change the operating
channel via your link radio, then the addition of the cable described here will enable that for you.
Only two connections are actually required in the cable but a short test would seem to indicate
that the original, unmodified cable can also be used. Whether this will have any effects on the
transmitted audio is not known. It doesn’t appear to over the short distances of the test.
Leaving this cable out doesn’t affect the basic rebroadcast function and leaving it in if you’re not
using channel changing likewise has no detrimental effect. For basic rebroadcast however, it’s
not necessary.
Operation Indicator Lights:
As pin 8 on the power connector is programmed to go
low, when a signal is received, as part of the normal
operation of the rebroadcast, If you wish, you can add
an indicator light or LED which gives visible indication
that each radio making up the rebro is actually working.
As this configuration doesn’t need or have a control
head fitted, there’s not really any other way of getting
this indication. Fitting an LED here has no effect on
the operation of the Tx/Rx side of things. Some form of
operating indication is to be recommended as when
using the Telemetry Output option, the loudspeakers
are cut off and there’s nothing to hear when either
radio receives.
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