[TrunkCom] Trunk-tracking Help

Tue, 19 Mar 2002 14:30:55 -0600

You're right, S14 is a very unusual fleet size, especially for a prison
with probably no more than 50 or 100 radios.

>From what you've said, I would have to guess it is a Type I system. The ids
you've given point to a Type I. My guess is that they have set up some sort
of patch between multiple subfleets. Even though you're seeing
conversations between ids 34135 and 37217, as well as between 34267 and
38374, what is probably happening is that one subfleet is in the
34135-34267 range, and the other subfleet is in the 37217-38374 range.

I would proceed on this basis, and start trying lower fleet sizes. I would
continue to monitor in E2 mode, and start recording every id. You should
start to notice them "clustered" around certain values. That should give
some clues on fleet size.

You're on the right track Scott, but I think this patch or whatever has
thrown you for a loop. Continue on the basis that there are two subfleets
there, and you should be able to figure it out.

Rob

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Message: 3
Date: Tue, 19 Mar 2002 03:42:45 -0800
To: [email protected]
From: Scott Baldwin <[email protected]>
Subject: [TrunkCom] Trunk-tracking Help

Hello to the list.

I'm trying to set up my BC-245 and BC-895 to track the trunking system at
the Vacaville CMF Prison site.  Their frequencies are 857-860.2625.

I started off in E2 mode, and noticed the ID's changed between radio
users.  So I assume it to be a Type-1 system.  Setting it in E1 Mode, I
chose S-14 as my size.  Even though this is an unusual size, I chose it
because I had caught traffic with an ID of 37217 and the reply came back on

34135.

Using the method of lowest ID and highest ID, the difference is 3082,
meaning at least THAT many users used block 4.  Since S-13 has a max of
2048 users, and S-14 is the next with 4096 users, for this reason I chose
S-14.

Now here's my problem.  I was monitoring the other day and a call came out
with an ID of 000-9 and a reply came back on 000-8.  It was the same
conversation.  My BC-245 was still set on E2, and I noted ID 38374 and
34267, respectively.  The problem as you can see is that the number of IDS
(difference between the two) is 4107.  This exceeds the max of 4096 as used

for a Type 1.

Does anyone know what kind of system this is, if it's not Type-1 or
Type-2?  I have tried Edacs and LTR, but I either don't know how to set
these systems up in my scanner, or they're not that either, as I've tried
programming them in, but they don't track at all.  It's as if they don't
see the control channel.

Thanks in advance.
Scott
N6UUH
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Cambion Chadeauwaulker
[email protected]
ICQ# 1023236
Northern California, USA

http://cambion7.thesociety.net/
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"In space, no one can hear you cha cha cha!" - Confidence

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