[Scan-DC] Loudoun County nonsense

Jeff Krauss jeff at krauss.ws
Mon Dec 14 22:09:30 EST 2009


Thanks for the intelligible explanation.
Do we expect that scanners capable of P25 Phase 1 can have firmware 
upgrades to support Phase 2?

At 09:59 PM 12/14/2009, Eric C. Carlson wrote:
>Some P25 systems are starting to use TDMA digital voice, which no
>scanner can currently decode.  So your P25 digital scanner would be
>like having an old analog scanner: you won't be able to hear anything.
>  Your existing digital scanners support what is known as P25 "Phase 1"
>digital voice.  P25 "Phase 2" is starting to appear (or at least a
>not-yet-officially-finalized version of it).  You can read more about
>this at radioreference.com.
>
>http://wiki.radioreference.com/index.php/Project_25#Project_25_Phase_II
>
>Systems using Phase 2 audio may also use Phase 1 audio (it's still
>there for backwards compatibility).  Think of it like Motorola systems
>that have both analog and P25 talkgroups.  Except in this case a given
>talkgroup that is normally Phase 2 could revert to Phase 1 audio if a
>Phase 1 radio joined the talkgroup.
>
>-Eric
>
>On Mon, Dec 14, 2009 at 8:40 PM, Jeff Krauss <jeff at krauss.ws> wrote:
> > Can someone translate the nonsense messages about Loudoun County into
> > plain English?
> > My scanner can receive P25 just fine.
> > So what if they convert from Motorola to P25?



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