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The Modified TMC Radio “Standard” Repeater , alternative suggestions. - The MA-ASIG Board
As the repeater function is now being provided by the crossover cable and not by the DMAP board as in the previous example, it is pos-
sible to dispense with this board in favour of the very much cheaper MA-ASIG board. This, again provides the necessary additional socket re-
quired in order to fit a control head. All other connections remain the same. The standard configuration for the MA-ASIG board does not sup-
port this facility and anyone wishing to use these boards must order the MA-ASIG board for use in a ‘Dual-Control-Head’ configuration.
There is a very significant price saving to be made in the use of these boards over a DMAP although in the configuration shown, a DMAP
board can be used without any changes if you wish or already have one.
The specification for the MA-ASIG board is contained in TMC publication A9k-465
SRM9030 fitted with MA-ASIG board
TWC
147.350MHz
Secondary rebroadcast Radio
Primary vehicle or rebroadcast Radio
Diplexer
No additional programming
of the radios is required and
both radios enter rebroad-
cast mode if the dash switch
is operated. Normal opera-
tion is returned to the main
radio if the switch is Off. All
team working channels are
then available.
Indication of the rebro
being active can be by
using an illuminated
dash-switch.
Power is switched to the secondary radio, only if rebroadcast
is required. The aerial change-over relay is powered at the
same time switching the diplexer in.
Using this method, no programming of the radios for repeat
mode is required. Everything is handled by the crossover
cable and the On/Off switch.
Connection to the vehicle power supply
Permanent power connection to the primary radio
Crossover cable
Re-Bro Aerial (Mast etc)
Normal Comms Aerial
(Vehicle Roof)
Dash-Mounted On/Off Switch
Co-Ax Change-
over relay
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