11
TWC
147.350 MHz
If the currently designated VHF rebroadcast channel of 147.350 MHz is to be used instead of a low band channel, then the risk of mutual interference
between the two radios is high.
This system has been made to work by introducing a degree of vertical separation between the aerials of each radio. Say one on the vehicle roof, and the
other at the top of a suitable mast. Over limited distances it does work and allows all Team Working Channels to be used. Again, channel changing is
effected by temporarily replacing the crossover lead with a control head in the TWC radio.
This is still not a fully practical solution but it does work. Being in the same band, the radios will tend to interfere with each other.
This aerial significantly higher
than the other.
Crossover lead
The High Band Rebroadcast Channels
and Vertical Aerial Separation.
“In-Band” Rebroadcast.
Defined as :- Both radios are in the same radio frequency band.
In this case, both are high band.
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