[TheList] Trunktracking in NZ

Thu Jun 11 16:49:08 AEST 2009

Thanks for the explanation, appreciated

ZLScanner wrote:
> 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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