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algorithm id
by Matt D 30 Jun '13

30 Jun '13

has anyone seen this algorithm id: Unknown (0xa4) ?? -- Matt D ------------

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sending wireshark patch upstream
by Michael Ossmann 26 Jun '13

26 Jun '13

I've had some people request that I submit the P25 CAI Wireshark dissector upstream for inclusion in Wireshark. It makes sense to me since it is quite stable. Do others agree? My only concern is that we currently use an unassigned UDP port and encapsulate P25 CAI in UDP. Should we try to get an official pcap data link type (DLT) instead? Are there reasons to prefer UDP over our own DLT? If so, should we pursue standardizing a UDP port number? Mike

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New (separate) GRC blocks: FSK4, decoder & Traffic Pane [1 Attachment]
by Balint 27 May '13

27 May '13

Hi folks, A quick update: I've added to gr-baz <https://github.com/balint256/gr-baz> some new OP25 blocks. I've split up the combined 'Decoder' block into the FSK4 and actual decoder (simple) parts. I've also added the traffic pane - you'll see how it fits together in the sample/OP25.grc Make sure you back up your old GRC file before you update so you don't end up in a nasty XML merge conflict! For those people that aren't hearing any audio, check if the traffic pane is showing you anything. For those wondering about talk of patches, instructions are here: http://wiki.spench.net/wiki/OP25 If you use r307+patch, you can also check the console to see if decoder information starts appearing to see if valid frames are being detected. Balint

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File source OK but USRP no audio
by souf308 25 May '13

25 May '13

Hi guys. First thank everybody for helping me those previous week. I'm really stuck on something now that I can't understand: When I' using the file source in OP25.grc everything seems working perfectly, I got the 4 ligns in the Dibits and I can hear someone speaking. HOWEVER when I use my USRP B100 here is the situation: I have 4 perfect lignes but NO AUDIO. Moving from the File source to the USRP, I dont touch any audio sink frequency or interpolation of the Rational Resampler or Channel rate so logicaly the probleme should not be coming from here.. Im pretty sure that I applied the patch r307. Furthermore this patch is also to make the audio work wich is the case with the file source so what..? Any suggestions please? Why the audio is working with the files source but not with the USRP? Thank you very much Souf

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Next branch (3.7)
by Matt D 24 May '13

24 May '13

Hi everyone, I am sort of weary of updating to using next branch (3.7) from 3.6.3 because I don't want lose my balance and get dumped. But I was told there is a feature there I may need. So is anyone using OP25 with 3.7 successfully? Cheers, -- Matt D ------------

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data unit handler
by Matt D 22 May '13

22 May '13

Hi guys, I have a pretty straight forward question. In directory op25/blocks/src/lib there is a file called logfile_du_handler.h and the comments within say that the code writes frames to a log file and that the name of the log file is d_log. How do we access this log file? Thanks a bunch -- Matt D ------------

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"Could not find a decoder to use"
by souf308 18 Apr '13

18 Apr '13

Hi guys, I managed to fix the error about the PYTHONPATH, thanks to Matt and Steve. It was still not working after setting the PYTHONPATH but I understood that I had to copy some files like OP25.py in a new directorie /usr/local/lib/python2.7/dist-packages/gnuradio and create here the directorie OP25. It stoped showing the import error. However I have now this error and any hint and help are welcome: ------------------------------------- File "/usr/local/lib/python2.7/dist-packages/baz/op25.py", line 88, in create raise Exception("Could not find a decoder to use") Exception: Could not find a decoder to use ------------------------------------- I made some searches in the previous discussion but I could not find anything. Any Idea? ps: I still have not applied the patch yet (maybe it's the reason?).. On the spench website they said to apply it to "the svn source" is it this one: ~/gnuradio/gr-baz ? Thanks in advance for you awnsers SouF

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Wireshark Dissector bug
by Matt D 03 Apr '13

03 Apr '13

Hi everyone, Has anybody seen this on a wireshark frame? : Packet Data Unit[Dissector bug, protocol P25 CAI: packet-p25cai.c:1453: failed assertion "state != -1"] Thanks, -- Matt D ------------

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Anybody used GNUradio v3.6.4.1 ?
by Matt D 03 Apr '13

03 Apr '13

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I am currently using GNUradio v3.6.3. IF I in move to v3.6.4.1 will this break my OP25? I am trying to install mulitmode.py but the make dies with "grcc:error:no such option:-d" so I think I may need the new GNUradio. - -- Matt D - ------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJRW3SXAAoJEIC13XTKWhPP5SoIALzM67gvzTxBuZDXkYqgoeDs VWmwUQd1yx5WNJ96thCOEITZStHBdpeA8R+xMP51vo3EN0sl36N89JlBCrSjzPpX UAwGy+eEgSTK+Nz8/10G86ciM8qls4qD2YxWhZGkhCRcETQhcg+zkqqu7ofFAu8X EfSq/+1RICoq/7c2jJC5cIJRsCUt1sGvhkYUlCvv6tGgLDiGaPM2DNltrTJOexUb G5hY/Pf1bOBxow+EwzyQWstLdB/sSRMV716fdOsV/Nsi7U/LMmXvnwIl52nLyN7K MvRs03Yx4n7QZ7Bc5R5eMINOu5tl2yixlicu83wYrfmvtqFD7fiKl1EjCyRGLAY= =HQkr -----END PGP SIGNATURE-----

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Wich distribution of ubuntu and wich version of GNUradio..?
by souf308 01 Apr '13

01 Apr '13

Hi everybody I'm a graduate student working on a project and I have to realise a reception with an USRP of P25 standart communications. I have basics knowledge in linux and I have been struggeling those days to make work gnu radio and gr-baz (with op25 module..). I tried many distribution: Ubuntu 12.10/ 32 and 64 bits and now I'm on Ubuntu 12.04 (64) and still have problem while compiling gnu radio.. I understood that there are a lot of dependency problems due to the different versions of Ubuntu and gnuradio. My question is simple, wich Ubuntu version should I take in order to make the gnuradio build script work without problems and gr-baz get installed without issues? Thank you very much Souf

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