[TrunkCom] Determining EDACS Logical Channel Order

Sat, 1 Jun 2002 22:13:45 -0700

Yes, however looking at the track record of the LCRA system at:

	http://www.trunkedradio.net/cgi-bin/display.pl?sid=48

Some of the repeaters are all out of order, for example:

	Smithville 935.7000  936.7000  937.2500  937.7250  939.9375
936.9500  	937.4625  937.8875  938.1750  939.4250 

Those frequencies are all jumbled around; the La Grange repeater is
listed: 

	La Grange 935.1375  937.6750  938.9000  939.4125  939.9125  

Everything is in order on that tower. It doesn't seem correct to me that
whoever set this system up would put some towers in order and others in
a different order. My thought is, all repeaters would use channels in a
slightly different order.

The order we are using for the channels is the order that the FCC has
the channels listed. These channels are SORTED by numerical order, NOT
by EDACS LCN. In fact, it even lists the Smithville tower in a
completely different order than that above; it lists them in numerical
order.

This is why I am saying, I think I have them out of order! 

That also is not to mention, the fact that I am hearing the random
bursts of data on a voice channel. When I use my conventional scanner, I
hear the repeater ID itself on channel 21 always, never any different.
My conventional radio picks it up, but the trunked radio doesn't.
Obviously the control channel is telling it NOT to unsquelch for that
amount of time. 

Therefore, could the control channel tell the radio to seek to channel
22 for example and unsquelch and its picking up a data signal, when
channel 22 should be a different frequency with voice?

I hope this makes some sense.

-- jwp

Justin W. Pauler <[email protected]>

> -----Original Message-----
> From: Scott Berringer [mailto:[email protected]]
> Sent: Saturday, June 01, 2002 20:01
> To: [email protected]
> Subject: Re: [TrunkCom] Determining EDACS Logical Channel Order
> 
> If you take the control channel out of the 'loop' (2nd in the list),
the
> radio will not know how to follow the system.
> That's why the frequencies are listed that way. Put all 5 of them in
and
> you should have no problem
> 
> 
> Justin W. Pauler wrote:
> 
> > Hello everyone! I had such great luck with my last question on this
> > mailing list; I figure I'll give this one a shot. Maybe someone has
done
> > something like this.
> >
> > One of the repeaters in my area for the Lower Colorado River
Authority -
> > Wide Area Radio System is in my city. I am missing some traffic on
this
> > system and also hearing traffic that is NOT on the correct talkgroup
> > using my PRO-94; however, if I put these channels into my old
scanner, I
> > can pickup all of the traffic with no glitch. My guess is that I
have
> > them in the wrong order.
> >
> > These are the frequencies that are in use, in the exact order they
are
> > shown in the FCC database (which sorts them, I know) and on
> > trunkedradio.net:
> >
> > 	935.1375
> > 	937.6750 <CONTROL CHANNEL>
> > 	938.9000
> > 	939.4125
> > 	939.9125
> >
> > I have laid them out in an empty bank in my conventional scanner,
bank 3
> > to be exact, like this:
> >
> > 	Ch. 21	935.1375
> > 	Ch. 22	938.9000
> > 	Ch. 23	939.4125
> > 	Ch. 24	939.9125
> >
> > I leave both scanners on and running and after scanning a few times,
I
> > always hear them in this order, they are SEQUENTIALLY correct. This
> > meaning, that I always hear traffic on 23, then 24, then 21 and then
22.
> >
> > My questions are these:
> >
> > 	1. How do I know where to start my trunked radio? Which
> > frequency is 	technically FIRST?
> >
> > 	2. Where does the control channel go in this layout? Would it
> > automatically be the first channel in this type of setup?
> >
> > 	3. Is the repeater ID a sign of the first channel?
> >
> > 	4. For all interested parties, this repeater in La Grange, IS
> > NOT 	transmitting the normal EDACS beeps after a
transmission!!
> Why,
> > I 	don't know.
> >
> > Given a way to identify channel number one, I would have an
excellent
> > chance to determine the correct order at the regular security checks
on
> > the hour on this system.
> >
> > ANY help would be appreciated greatly!
> >
> > -- jwp
> >
> > Justin W. Pauler <[email protected]>
> >
> >
> > _______________________________________________
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> > mailto:[email protected]
> > http://mailman.qth.net/mailman/listinfo/trunkcom
> >
> >
> >