[TheList] Trunktracking in NZ

Thu Jun 11 16:21:52 AEST 2009

Just to explaIn briefly what "channel voting" actually is....

Using for example Fire Service in Canterbury
The coverage area of the "Christchurch Fire" exclusive channel
stretches from... covering Central and North Canterbury
...in the east  - Sumner and Lyttelton
...in the west  - Springfield and Oxford
...in the south - Rakaia, Southbridge and Leeston
...in the north  - Culverden, Waiau and Scargill

To provide radio coverage, there are three widely spaced
radio repeater sites.
 A = Sugarloaf (the TV tower) - west side of Chch
B = Mt Pleasant above Lyttelton - east side of Chch.
C = Mt Alexander (east of Culverden) for North Canterbury

The radios will be scanning the three repeater channels
continuously, looking for any incoming signals and will
goto (switch or vote) to the strongest received signal of
the three whenever anything is received.
That is unlike a scanner which when monitoring all three
channels, will just stop scanning on the first one it hears
that has that anything which caused the mute of the
scanner to open.

So therefore if you were in central Christchurch your voting
radio could be receiving audio from either A or B, and if you
were hidden behind a wall of a building facing north - then
you could well end up listening to repeater C - it would be
the one with the strongest signal that you would be listening
to but would not necessarily be the clearest signal.
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