trunk-recorder cannot decode P25 Phase 2

[CqDx]

Hello,
I have been using a Raspberry Pi 3 B+ with trunk-recorder installed and it’s doing a great job on decoding and recording P25 Phase 1 traffic, but when the network recently started carrying Phase 2 traffic, all it records were garble and unintelligible traffic. I see the logs reflect it recognizes TDMA traffic but it just would not record Phase 2 intelligibly.

Anyone has experienced this as well and if so, what was your solution?

Thank you!

 

[EarHoles]

Encryption?

 

[GTR8000]

Experienced the same with a fully TDMA system. Was mentioned by the developer that it's possible there is an issue with decoding TDMA on ARM hardware. I'm glad you posted this, as it confirms what I was experiencing. Hopefully they'll be a solution for it. Make sure you post this on GitHub also.

robotastic/trunk-recorder

Records calls from a Trunked Radio System (P25 & SmartNet) - robotastic/trunk-recorder

github.com

 

[GTR8000]

Encryption?

Negative, it's not an encryption issue for either system we're dealing with.

 

[EarHoles]

Roger

Negative, it's not an encryption issue for either system we're dealing with.

 

[CqDx]

I had no issue decoding and recording it on SDS100, I’m inclined to try a different Linux machine just to see if it’s ARM hardware related

 

[GTR8000]

MRRS/Metro-25? Let me know how you make out if you try non-ARM hardware. Right now I only have the same 3 B+ available for testing, and obviously that hasn't been successful with TDMA for either of us.

 

[CqDx]

Yes and also NJICS on Alpine and DOITT P25 site also. The same problem across Harris, Motorola - ASR and Simulcast.

 

[GTR8000]

Okay good. I mean, not good, but good that it's not an issue with just one TDMA system. And you having success with the FDMA talkgroups on those systems is also reassuring.

 

[wgbecks]

I don't think the issue is ARM hardware. OP25 decodes Phase-II TDMA perfectly on the same hardware.

 

[GTR8000]

I don't think the issue is ARM hardware. OP25 decodes Phase-II TDMA perfectly on the same hardware.

Right, but Trunk Recorder uses its own build of OP25.

 

[jonk6]

You might want to grab the latest TR from GitHub. It includes a fix for this issue.

 

[CqDx]

I can confirm that with the latest update on trunk-recorder this issue has been resolved. !

 

[mikewren]

Can confirm the update from May works terrific on P25 Phase II TDMA. Thanks!