[TrunkCom] MPT1327 information

[Jeff Kenyon]

I will take a listen.  On another note, has anyone heard these types of
systems from a distance?  I haven't spent much time with this band, but in
terms of the modulation I think that the  makers are taking a step back,
and had always been under the impression that these systems were digital.





On Sun, 24 Oct 2004, Gary Hahn wrote:

> Compare to the following sound samples...
>
> http://kb9ukd.com/digital/220pilot.wav As heard in NFM, but actually uses
> ACSB (similar to SSB) for voice comms. The pilot tone is transmitted about
> every 10 seconds.  In Milwaukee, 220.0125 is one frequency, but you may have
> to tune up or down a bit to hear it.  Sorry for the scratchy copy, I'll work
> on a better sample.
>
> http://kb9ukd.com/digital/mpt_1327.wav is MPT1327, but I didn't think it was
> associated with ACSB modulation.
>
> Gary
>
> > -----Original Message-----
> > From: trunkcom-bounces at mailman.qth.net
> > [mailto:trunkcom-bounces at mailman.qth.net] On Behalf Of Jeff Kenyon
> > Sent: Sunday, October 24, 2004 10:55 PM
> > To: Discussion of Monitoring Trunk Radio Systems
> > Subject: RE: [TrunkCom] MPT1327 information
> >
> >
> > Well, I don't know.  These systems are broadcasting in ACSSB,
> > and I hear what seems to be a regular control channel  I also
> > am hearing data bursts here  The systems listed on the web
> > are MPT-1327 systems.
> >
> >
> >
> >
> >
> > On Sun, 24 Oct 2004, Gary Hahn wrote:
> >
> > > Bear in mind this topic split from the original.  The 220 systems
> > > discussed most likely are not MPT1327, rather SEA radio's LTR clone
> > > protocol(someone can correct me on the details there...).
> > >
> > > Nonetheless, nice links for the MPT1327 stuff!
> > >
> > > Gary
> > >
> > > > -----Original Message-----
> > > > From: trunkcom-bounces at mailman.qth.net
> > > > [mailto:trunkcom-bounces at mailman.qth.net] On Behalf Of Mike Agner
> > > > Sent: Sunday, October 24, 2004 5:39 PM
> > > > To: Scan-L at listserv.uark.edu
> > > > Cc: trunkcom at mailman.qth.net
> > > > Subject: [TrunkCom] MPT1327 information
> > > >
> > > >
> > > >    Since there seemed to be a little interest in this mode, I
> > > > thought I might throw out a couple of notions about decoding
> > > > packages and such...
> > > >
> > > >    Apart from the Winradio module for Moto and MPT
> > trunking, there
> > > > are a few other packages - some even with Yahoo support groups -
> > > > that you can
> > > > find links  for here:
> > > >
> > > >
> > http://www.strongsignals.net/access/content/software.html#DECODE
> > > >
> > > >    Interestingly, some can use the discriminator output, but most
> > > > seem to be able to handle tapping the speaker out for the audio.
> > > > Some seem to need
> > > > some sort of external modem circuit, not unlike the kind of
> > > > setup you would
> > > > use for Trunker.
> > > >    Don't forget - there is a dedicated forum on Radio
> > > > Reference for MPT1327,
> > > >
> > > >    73s Mike
> > > >
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