[op25-dev] Re: P25 TDMA

Alex alex323@gmail.com [op25-dev] op25-dev at yahoogroups.com
Tue Sep 27 23:54:15 UTC 2016


On 27 Sep 2016 16:45:11 -0700
"ikj1234i at yahoo.com [op25-dev]" <op25-dev at yahoogroups.com> wrote:

> That is a very interesting question, there is some margin built in to
> the timing specs, but it's not clear how much the time difference of
> arrival would eat into that.  It's usually not that common or easy to
> monitor mobiles directly in UHF/800/900 - the much more common case
> is to listen to them via the repeater output (downlink) anyway, also
> TDMA isn't currently used for direct (simplex) mobile/mobile comms.
> 

Wouldn't that make multilateration of P25 phase II handsets impossible,
since it's entirely predicated on measuring TDOA? Or is the guard
interval sufficiently long enough that it doesn't matter at short
distances?

-- 
Alex
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