19
The TMC Radio “Standard” Repeater.
The ‘Practical “Standard” Repeater’ is designed to provide the missing socket needed for the fitting of a control head to the two
SRM9000’s that make up the rebroadcast section. This allows us to do away with the third SRM. It also requires some programming to be
carried out on both SRM’s in order that we can control whether the radio is operating normally or in rebroadcast mode. The DMAP board pro-
vides this additional socket, in fact it provides two additional sockets. It also provides an enhanced level of audio processing and takes care of
the repeater logic switching.
SRM9030 internally fitted with DMAP board
TWC
147.350MHz
Secondary rebroadcast
only Radio
Primary vehicle or TWC rebroadcast Radio
Control of re-broadcast is via
the programming in both
radios.
It isn’t necessary to program
a ‘Radio Select’ option as the
secondary radio performs
only one function. You need
only program a ‘Repeater’
button.
Diplexer
Pin 8
Pin 4
If the primary radio has a button programmed to send the DB-15 pin 8, low
when pressed (Auxiliary) then the aerial change-over relay will operate and
switch in the diplexer. When ‘Off’, the diplexer is not in circuit and all chan-
nels can be used
The aerial change-over relay
Refer to TMC Radio publications A9k-821, and the ‘MA-DMAP Option Board Technical Manual’ which gives details of programming
This is the default aerial used when rebroadcast has not
been switched on.
When switched to rebroadcast
mode, the aerial changeover
relay reconnects the TWC radio
to this aerial. Normally this
would be a pump up mast aerial
or similar.
To Next Page
Loading...
