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Old 07-12-2018, 11:06 AM
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Default SDS-100 or any Uniden scanner... P25 identification

I’m in need of guidance.
Recently I’ve found a P25 transmission in a frequency not listed in the RR database. So I proceeded to listen and take notes.

I found the NAC and also concluded that there are clear and encrypted transmission. I see “P25” and “LINK” display. “ENCRY” when the transmission is encrypted.

Now I want to build this system, listen more and later submit it to RR.

My doubts are:
How do I determine if this is a P25 One Freq., a P25 TDMA, a Motorola ... system?

How do I determine the control channels?

So far, via ID Searching, I identified only one talkgroup “1”.

My apologies for the rather noob questions.


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Last edited by ecarvalho; 07-12-2018 at 11:12 AM..
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Old 07-12-2018, 11:34 AM
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A P25 control channel broadcasts continuously. If you hear voice on the freq it's not a control channel.

Look up the frequency on digitalfrequencysearch and that will tell you who it's licensed to, as well as other frequencies licensed to the same entity.

If the only talkgroup is 1, it's probably a P25 conventional system, and there may not be a control channel, or any other frequencies involved.
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Old 07-12-2018, 11:39 AM
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I will look it up!
Yes, talkgroup “1” is the only one so far.
I appreciate


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Old 07-12-2018, 12:05 PM
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It is not there in the digital search site. Tho I also found that the frequency in question is common use. So looks like this is a one frequency P25 system


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Old 07-12-2018, 12:30 PM
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If you're only seeing TG "1", it's probably just a conventional frequency using P25.

What is the frequency and have you identified the users/usage?
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Old 07-12-2018, 12:43 PM
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Troy
Haven’t heard much that makes sense and most traffic is encrypted.
409.0750 NAC 293


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Old 07-12-2018, 12:59 PM
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Maybe?

https://www.radioreference.com/apps/db/?aid=7770
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Old 07-12-2018, 1:01 PM
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National Disaster Medical System CH 7/8.

Federal Disaster Scanner Frequencies and Radio Frequency Reference
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Old 07-12-2018, 1:09 PM
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Ok I saw that before but there was no NAC listed so I thought the one I found was different. Guess not?


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Old 07-12-2018, 1:10 PM
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Keep in mind that, like many things, the RRDB listings aren't always perfect and/or complete.
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Old 07-12-2018, 1:16 PM
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Quote:
Originally Posted by troymail View Post
Keep in mind that, like many things, the RRDB listings aren't always perfect and/or complete.


For sure!


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Old 07-12-2018, 1:24 PM
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Thanks guys for your help
Its a pretty active frequency and they talk about posts, roll calls, child care center, but responses are mostly encrypted.


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Old 07-12-2018, 2:45 PM
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Quote:
Originally Posted by ecarvalho View Post
Troy, I haven’t heard much that makes sense and most traffic is encrypted on 409.0750 NAC 293
Log the RID as well so the user can be identified.
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Old 07-12-2018, 7:52 PM
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Quote:
Originally Posted by devicelab View Post
Log the RID as well so the user can be identified.
I hear a command center with ID 2. Others are 2 digit IDs ...
This is doesnt sound like a Disaster Medical team...
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Old 07-12-2018, 7:59 PM
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Here I found something...

Common Use Channels
Worth monitoring are these common
-
use frequencies
which are available for use on a shared basis by any
federal agency: 163.1/168.35, 163.7125, 168.6125,
173.625/167.1375, 407.525/416.525, 409.05/418.05,
409.075/418.075, 409.3375/418.3375, 412.825,
412.8375, 412.85, 412.8625, 412.875, 412.8875, 412.9
and 412.9125. The older wide
-
band channels are:
408.4, 418.05, 418.075 and 418.575

Source: http://henney.com/chm/0117/chm0117.pdf
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