op25-dev

op25-dev@lists.osmocom.org

308 discussions

by Matt D

-----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-----

12 years, 4 months

Wireshark Help

by Matt D

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 -----------------

12 years, 5 months

No Audio

by md123＠nycap.rr.com

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

12 years, 5 months

No audio output from OP25 block

by md123＠nycap.rr.com

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 ----------

12 years, 5 months

Wireshark start up problem

by md123＠nycap.rr.com

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

12 years, 5 months

Sample rate?

by md123＠nycap.rr.com

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 -------------

12 years, 5 months

IndexError: gr_firdes check failed: 0 < fa <= sampling_freq / 2

by md123＠nycap.rr.com

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

12 years, 5 months

SignalScope

by md123＠nycap.rr.com

Hello everybody! I want to use the SignalScope; especially the correlation tab looks very useful. However, i cant get numpy with the script on the SignalScope page. Any recommendations?

12 years, 5 months

no_subject

by Brian Schmitz

http://www.elicodesign.ca/clwxihv/jqtbbhgqytn/guhcaezy.php

12 years, 5 months

by md123＠nycap.rr.com

Hi everybody! I am in the process of collecting some signals. Do I want FM discriminator output or digital IQ? I dont know what kind of file to feed to the file source block: .wav or .mp3 or what? Thanks, Matt ----------------

12 years, 5 months

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