[Scan-DC] Arlington County encrypted TGID 115?

[Andrew Clegg]

Thanks all! Dewey -- cool detective work. Let me know what you find out.

Here's what I know so far:

  *   Whenever that TGID is active on the output (as shown on the HP1), I can always hear a transmission on the input frequency from my QTH in Ballston.
  *   The signal strength (on the input frequency) seems to be about the same each time, and hasn't changed in two hours, so the unit is apparently stationary.
  *   There is only one unit ID that shows up on either the input or output: 3134800.
  *   If it really is only a single unit, is he/she doing some kind of broadcast? They don't appear to be talking to anyone else.
  *   Or perhaps encrypted channels only show one unit ID?
  *   The nearest TGIDs listed in radio reference are 112 (Animal Control) and 117 (Emergency Management Channel 1).

I don't have much experience with sleuthing P25 systems!

________________________________
From: scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net> on behalf of Fxpd614 at comcast.net <Fxpd614 at comcast.net>
Sent: Saturday, March 20, 2021 1:01 PM
To: scan-dc at mailman.qth.net <scan-dc at mailman.qth.net>
Subject: Re: [Scan-DC] Arlington County encrypted TGID 115?

I don't have that id number in my notes.
Is this possiblly a vaccine event?  That tg might be a emergency management or heath department talkgroup?


Sent from Xfinity Connect Application

-----Original Message-----

From: dewey3 at gmail.com
To: Scan-DC at mailman.qth.net
Sent: 2021-03-20 12:41:52 PM
Subject: Re: [Scan-DC] Arlington County encrypted TGID 115?

Andy,

I just switched my Unitrunker from PG to Arlington to see if I can find out
anything.  Unfortunately, it's not the greatest signal for me, so I'll see
what happens.  What I normally do in cases like yours is run Unitrunker via
RTL-SDR for as long as needed, 3 or 4 days?, a week?, a month?, then go back
and follow the IDs that associated with the mystery talkgroup and see where
else they're associating.  I am seeing a lot of associations with 115, but
due to my poor signal, the actual system tracking is starting and stopping.
I'll see what I have after an hour or two.

Dewey

-----Original Message-----
From: scan-dc-bounces at mailman.qth.net <scan-dc-bounces at mailman.qth.net> On
Behalf Of Andrew Clegg
Sent: Saturday, March 20, 2021 12:14
To: scan-dc at mailman.qth.net
Subject: [Scan-DC] Arlington County encrypted TGID 115?

Hi all,

Arlington County's P25 system has a TGID of 115 that's encrypted.  That ID
is not listed in Radio Reference. Anyone know what it's used for? Only one
unit ID ever shows up (3134800), although perhaps that's an artifact of an
encrypted channel? The TGID is fairly active at the moment. I'm seeing it on
the trunk system's output frequencies via my Home Patrol 1 "Current
Activity" utility, and simultaneously on the input frequencies via my Icom
8600.

73,
W4JE

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