op25-dev March 2013

op25-dev@lists.osmocom.org

11 participants
22 discussions

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

3 2

In need of signal samples
by md123＠nycap.rr.com 01 Apr '13

01 Apr '13

Hi everybody! I would have thought that there would be samples the web but i have been unable to find any and the link on osmocom is broken. I am in need of some signal samples so i can familiarize myself with the scopes and how the signals look in them. I want to start with P25 but I really need to be familiar with all sorts of signals so sharing of any kind of signal will be much appreciated. Thanks! Matt ----------------------

4 7

The Old OP25 apps
by Matt D 29 Mar '13

29 Mar '13

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone! I would like to bring back one of the tabs in the old OP25; the tab that displayed all the ids and wut-not. I had the old version somehow but I uninstalled it and deleted it so i cant even have a look at the code behind that tab. Would it be possible to add that tab to the new OP25? If so that would be something I would like to try to do. I was also wondering if it would be possible to add the 'correlation' tab from the signal scope app to the new OP25? Thanks, Matt D - ------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJRVP0JAAoJEIC13XTKWhPPs9sH/jYai1wYYZ0Xx+7eKJkg/PEQ qtL0LIZc9QOwmokbuoA8pbiidW2VFPmNzWvhfp48eWECnNIknwbJ/wR8CRNOBdnO caf4AzvnosvlmwwnEOp7Y6XdnbK1FIhapQ/PBGhkycFM6HctwS4pcvj1YzCYp0gS fGnAwu9MkSiGfNf0Nt7clblK9cWYZ7ZNE0EjFg+edqI+g8na2thXaABUxMSTVm73 DSe9Me2u+owSWyYwuaQgG4DmQrQivsOsWbVnKXR5BcRYHGQ/r16IQboblUHOplEL axdXHDY9nsjNHH54hYPs4uWxninsyhfwXftFH4DRwdrc2AT7S8NAJvX96+gI8rY= =8yVZ -----END PGP SIGNATURE-----

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Thanks Guys!
by Matt D 28 Mar '13

28 Mar '13

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone! I just wanted to say that I have been using OP25 with wireshark for a while now and I want thank all you guys who endeavored to put OP25 together. And thank all of you guys very much for being patient and helping me to clean myself of my errors which were many because I never even used Linux before trying OP25 with GNUradio. Thank you very much! - -- Matt D - ------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQEcBAEBAgAGBQJRU6sRAAoJEIC13XTKWhPP7zgIAKGtd2SZ2Fcg2PfjP1+Jykd2 zmCj137X0Z3pg43VH97mWKH0WtDZpC7s2h5MWBoIJg+dOswMXfliA7UoQaqVThqn 25mRURRPaYf07oFGZni5CH+6t7zvvbKduFDSdk5/Ze6HvrgijsKymVLvBSizwNjJ gbhDkn17rHmSAS2v856zYG/3XFzhIdhkL/4181H2+C9gqGqx2OpTuBSYclUFAPVn YQJT55dJhPe9ib1x6qeoLHRTCGAC86iav2yciqGLSP5QHPZMLmr3lSGeOEaCapA6 +jK3JMLYpHLZYD/oU/QnxKcSYkzNLgqPO8m3NInFhY8tnTwSvKnrMklFl8E9lyY= =rQMr -----END PGP SIGNATURE-----

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Wireshark Help
by Matt D 22 Mar '13

22 Mar '13

Hello everybody, osmocom is down (sad) so I cant look for the answer there. How do I tunnel the gnu radio into wireshark? is there a sink that goes to an ip address or a usb port or something? I am stuck here without the instructions on osmo. Thanks, Matt -----------------

3 6

No Audio
by md123＠nycap.rr.com 20 Mar '13

20 Mar '13

Hi guys. I set the sample rate at 1.024M because the RTL2832's minimum sample rate is 900k, the decimation at 32 and the samp_per_sym st 8 so I get a channel rate in the decoder of 38.4k. I watch the the FFT Plot until the carrier freq pops up, I center that channel on zero, narrow the bandwith a little, looks like good 4FSK. So then I go to the Dibits tab, change the marker to dots and there is the four lines streaming across the scope perfectly, not one dot out of place. But no audio. What am I doing wrong? Thanks, Matt

1 0

No audio output from OP25 block
by md123＠nycap.rr.com 14 Mar '13

14 Mar '13

Hello everybody. I am trying to figure out why I get no audio from OP25. So I hooked up a scope plot to the audio output of the OP25 block. And nothing, the line is flat. Any ideas as to why OP25's audio output is dead? Thanks, Matt ----------

2 2

Wireshark start up problem
by md123＠nycap.rr.com 14 Mar '13

14 Mar '13

Hi everybody! Using the scripts on osmocom i put wireshark on my machine. The download, unpack, patch, build and install all went with no problem. Now trying to run wireshark the start up fails with this error: ERROR:about_dlg.c:271:splash_update: assertion failed: (ul_sofar <= ul_count) Has anyone dealt with this error or know any sort of solution? Cheers, Matt

1 0

Sample rate?
by md123＠nycap.rr.com 14 Mar '13

14 Mar '13

Hi guys! I am wondering what is the optimal sampling rate for capturing of P25 transmissions. My main problem (aside from not getting audio) is that, while I can successfully capture at upwards of 2.0M, I can only play back at around 56k without greying out the gui. I am a little confused about this because I thought the throttle would control the clock speed for play back. Any suggestions on configuring the settings would be greatly appreciated. Cheers, Matt -------------

2 2

IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2
by md123＠nycap.rr.com 12 Mar '13

12 Mar '13

Hello everyone! I am getting another weird error here. i received my USB e4k tuner and it was working. On OP25 i was using the scopes trying to figure how to get the four lines of dots and with RTL_FM i was getting audio, although the quality was bad. So i shut it down and i went out try on high ground but the signal was still weak. So i shut it down again, put myself within line of sight of the tower, and started it up and now OP25 dies like this: Traceback (most recent call last): File "/home/matt/gr-baz/gr-baz-master/samples/op25_grc.py", line 595, in <module> tb = op25_grc() File "/home/matt/gr-baz/gr-baz-master/samples/op25_grc.py", line 339, in __init__ self.gr_freq_xlating_fir_filter_xxx_0 = gr.freq_xlating_fir_filter_ccc(decim, (firdes.low_pass(1, samp_rate, xlate_bandwidth/2, 1000)), xlate_offset+xlate_offset_fine-fine_click_freq-auto_tune_offset_freq, samp_rate) File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/gnuradio_core_general.py", line 6871, in low_pass return _gnuradio_core_general.firdes_low_pass(*args, **kwargs) IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2 I have no idea how OP25 (same for RTL_FM) goes from working to failing with this error. Anyone have any ideas about this error? Cheers, Matt

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op25-dev March 2013