SDRTrunk How to Set Up SDRTrunk for a Non-Trunked P25 System?

[wagros]

Hello, friends.
I'm back again with some questions about SDRTrunk.

I’m monitoring a public service that is divided into seven areas in my city.
Each area operates on a different frequency.

In general, the Radio ID of the base operator and the Talkgroup are always set to 1, regardless of the frequency.
The only variation is the Radio ID of the units. However, sometimes the units also appear with Radio ID 1, while the base may show a different Radio ID.
This has caused some confusion regarding how to configure aliases.

This is a non-trunked P25 system, so there is no control channel.

Available Data (I’m using hypothetical frequencies to maintain system privacy.)

Name Frequency NAC Area
SIS_10 171.00010 EAD North
SIS_11 171.00011 293 Center
SIS_20 173.00020 DEF East1
SIS_25 173.00025 D45 West
SIS_28 171.00028 985 South2
SIS_29 171.00029 76E South1
SIS_35 173.00035 65A East2

I need help setting up a monitoring system that allows me to prioritize playback by area.
Can you help me?

 

[Whiskey3JMC]

This is a non-trunked P25 system, so there is no control channel.

So in other words these are a series of conventional P25 frequencies? Aliases don't go by RID but rather by TGID (Talkgroup ID) Are the TGIDs also "1" on each of these frequencies?

 

[wagros]

So in other words these are a series of conventional P25 frequencies? Aliases don't go by RID but rather by TGID (Talkgroup ID) Are the TGIDs also "1" on each of these frequencies?

Exactly.
I couldn't establish a consistent RID pattern to divide by areas, especially since the units sometimes use the base's RID, and all frequencies share the same TGID.

What differentiates them, except for the frequency, is the NAC.

 

[Jbond0072000]

Exactly.
I couldn't establish a consistent RID pattern to divide by areas, especially since the units sometimes use the base's RID, and all frequencies share the same TGID.

What differentiates them, except for the frequency, is the NAC.

get any resolution here? having same issue with non-trunked p25 system, all with TGID of 1. Still dont think a NAC can be used to differentiate them right?

 

[wagros]

get any resolution here? having same issue with non-trunked p25 system, all with TGID of 1. Still dont think a NAC can be used to differentiate them right?

I couldn’t get it to work, so I ended up giving up on SDR Trunk.
Even with the PPM properly calibrated, there were times when the program wouldn’t play audio from certain channels I knew were active, I confirmed it by comparing with another SDR running on a different laptop.
On top of the issues with TGs and IDs, that really frustrated me as well.

 

[Jbond0072000]

I couldn’t get it to work, so I ended up giving up on SDR Trunk.
Even with the PPM properly calibrated, there were times when the program wouldn’t play audio from certain channels I knew were active, I confirmed it by comparing with another SDR running on a different laptop.
On top of the issues with TGs and IDs, that really frustrated me as well.

Thats a bummer. Appreciate the follow up!