Discover and identify talkgroups in a Trunked P25 Phase 2?

[nokoa3116]

I was wondering how do people in the database get talkgroup information as to like what channel is called in a talkgroup?
I am monitoring an undocumented system, p25 phase 2 TDMA, it is extremely difficult to really determine what is what especially when I don't live in the area.

 

[Reconrider]

Typically people who submit truck systems have an “in” where the system is so they know before hand.
Use who don’t have that, listen for hours to confirm. Google the addresses log the names

 

[sonm10]

This is a very good question, one I myself asked a couple years ago. Since then, I have identified a couple DMR and NXDN systems.
First, it is important to know WHO the system is geared towards. Being your situation is P25, I'm guessing public safety or utilities.
The next step is to LISTEN. Different types of entities will have their own conversation. Example, a police office responding to dispatch will be a law dispatch channel, EMS units will have medical related conversation, public works will have conversation of that sort too, etc, etc. Also for public safety it is important to note if it is a dispatch, tactical (tac), and car-to-car channel, etc.
Sometimes it may take a long while to identify a talkgroup user. Use recording software when not near a radio to record and listen back later. I use Proscan with my unidens for this purpose.

 

[u2brent]

If the system replaced an older system and info for that older system is floating around, You can derive how the new one may be set up. check for deprecated systems, dig around the wiki sections.
and some tips from another thread..

Identifying TGIDs

Greetings - I hope this is the proper forum to ask for this help - using SDS 200, doing Trunking Discovery for an adjacent county interop - many clear hits of all sorts, only the TGID number is displayed - I have tried my best to scour RR for help but no luck - my question is how do I find out...

forums.radioreference.com

 

[slicerwizard]

I was wondering how do people in the database get talkgroup information as to like what channel is called in a talkgroup?

Some of us read subscriber radio codeplugs.

 

[west-pac]

Do a RR/FCC frequency search to see who has a license in your area for that frequency and mode(P25). The license will tell you who owns system, other frequencies involved, and where it's located. If multiple locations are listed, and you feel so inclined, you could take your scanner on-the-road to really pin down a location. Write down the TG numbers, Radio ID numbers, unit numbers of the people when talk, and keep a log, then reference the log and add to it when you hear other units talk.

 

[Whiskey3JMC]

I was wondering how do people in the database get talkgroup information as to like what channel is called in a talkgroup?

Many of us use scanner radios with the "ID Search" function (Uniden) or wildcard talkgroup (Whistler) enabled. Others use software-defined radios with trunk tracking software apps to do this. You need to be somewhat familiar with who you're listening to and keep an ear out for identifying info (locations, key words, etc) to properly ID who uses what talkgroup

I am monitoring an undocumented system, p25 phase 2 TDMA, it is extremely difficult to really determine what is what especially when I don't live in the area.

Can you give us some info about where you're located and maybe a frequency or two from the system in question? There's a possibility it may be documented. If it isn't coming up in a database search for your state, perhaps it's a system from another state, maybe even a new site from an existing (and perhaps larger) system? Quite a few possibilities exist. Just keep listening & maybe you'll hear some identifying info

 

[marksmith]

New unidentified systems are rare. I suspect the system you are working is identified in the database in a way you are not looking for it.

 

[nokoa3116]

Many of us use scanner radios with the "ID Search" function (Uniden) or wildcard talkgroup (Whistler) enabled. Others use software-defined radios with trunk tracking software apps to do this. You need to be somewhat familiar with who you're listening to and keep an ear out for identifying info (locations, key words, etc) to properly ID who uses what talkgroup


Can you give us some info about where you're located and maybe a frequency or two from the system in question? There's a possibility it may be documented. If it isn't coming up in a database search for your state, perhaps it's a system from another state, maybe even a new site from an existing (and perhaps larger) system? Quite a few possibilities exist. Just keep listening & maybe you'll hear some identifying info

New unidentified systems are rare. I suspect the system you are working is identified in the database in a way you are not looking for it.

This is for a system in a different country. Some data exists, site frequencies. However I found that none of the listed ones are in operation. I am operating this radio remotely, I am not very familiar with the way a police department communicates in this country so it has been quite tricky to determine what is what.


Thank you for all the replies!