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Type II Help

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N4KVE

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I was wondering how to calculate the input channels of a VHF Type II system so as to listen to the MSUs transmitting to the tower.

TIA
Greg
There is no formula like for UHF which is 5 MHz, or 800 which is 45 MHz. There is no set split. Every freq could be different.
 

riveter

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There will still be a bandplan. Every RF channel (freq pair) assigned in a Moto system has to be assigned a bandplan entry, even if it's the only RF channel referencing that entry.


You gotta sniff it with a system decoder such as Pro96Com or Unitrunker to get the bandplan... then you should be able to figure it out. The split is listed in the bandplan based on difference from the base radio TX freq in MHz. If you know what the output frequency is and the bandplan line referenced for that RF channel, you can get the input by applying the split in that line.

So, just for wild weird example, if the system reports output freq 154.010 as using bandplan line/entry 2, and the bandplan reads (abbreviated):
1 | whatever base freq | -1.5MHz offset
2 | whatever base freq | -1.1MHz offset
by applying entry 2 to 154.010, you get an input frequency of 152.910 MHz.
 
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slicerwizard

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I was wondering how to calculate the input channels of a VHF Type II system so as to listen to the MSUs transmitting to the tower.
The input channels for the system in question are probably already known here, but you're being cagey...


So, just for wild weird example, if the system reports output freq 154.010 as using bandplan line/entry 2,
Type II systems report no such thing.
 

riveter

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You know what, slicer, you're absolutely right. I lost my brain, and you called me for it- thank you. Please disregard the above.
 
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