[TrunkCom] Astro/APCO25

Tue, 16 Apr 2002 09:41:48 -0400 (EDT)

The 9600 BAUD control channel sounds a little different from the 3600
control channel that you can track.  I'm not sure though what the
difference is with the soundsof VSELP verses CAI

On Mon, 15 Apr 2002 [email protected] wrote:

> Thanks-
> How do you tell the difference? By the way the control channel sounds? What
> I've got locally is federal  gov't uhf system. Is there a standard they use
> across the country as for which type?
> sly
> 
> Brian J Cathcart wrote:
> 
> > On Mon, 15 Apr 2002 21:11:32 -0500 [email protected] writes:
> > > Motorola digital Astro system is not APCO25 compatible right?
> >
> > Yes and no, it depends which Astro you are talking about.  Motorola has
> > called all of their digital systems Astro, both their non-APCO-25 digital
> > system and APCO-25 digital systems.  What you have out there is:
> >
> > - Astro systems using the non-P25 3600 baud control channel with the
> > VSELP (non-P25) vocoder [example: Celeveland, OH and Memphis, TN]
> >
> > - Astro systems using the non-P25 3600 baud control channel with the IMBE
> > (P25) vocoder [called "Astro CAI"] [several examples, such as state of
> > Florida, Boca Raton, etc]
> >
> > - Astro systems using the P25 9600 baud control channel with the IMBE
> > (P25) vocoder [state of Michigan]
> >
> > All of these are called "Astro" systems.
> >
> > --
> >
> > The Scanner Dude
> > Brian J. Cathcart - KE4PMJ
> > South Florida Frequency & Trunking Guide - 6th Edition (On CD-ROM too!)
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> 
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