op25-dev

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314 discussions

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

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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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SignalScope
by md123＠nycap.rr.com 12 Mar '13

12 Mar '13

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?

2 2

no_subject
by Brian Schmitz 10 Mar '13

10 Mar '13

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

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by md123＠nycap.rr.com 09 Mar '13

09 Mar '13

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

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Re: [op25-dev] Re: Updating the OP25 codebase
by Keith S 08 Mar '13

08 Mar '13

I'm not much of a coder but I can assist in taking captures of a p25 phase II system. There is a site near me. I have a gnuradio setup using rtlsdr dongles. Let me know how and what you would like me to capture. There are audio channels and a Motorola trunking control channel on this site. I've done some basic decoding of the control channel with some windows apps already but haven't tried anything with gnuradio yet. Keith ikj1234i <ikj1234i(a)yahoo.com> wrote: > > >Hello Stevie > >Good to hear from you - this sounds like a good idea, for sure. > >It's always tempting to take such an opportunity as this to rewrite the entire system from scratch :) > >I think another piece to add to the puzzle that perhaps might be broken out as a separate item of concern would be UHD support. > >Mostly I think that would affect our py code but not so much our C++ blocks. > >Also when you added the fsk4 demod block to the op25 core it took me longer than it should but as of a few days ago I checked in several remaining stragglers to svn, all of our py code is now upgraded to use the in-tree version. I think there may have been one or two _very_ old ones that still use Franks' p25 and RD-LAP protocol handlers, but those apps date back to the days before our project had its own protocol processing... > >Also for GR 3.6 in addition to cmake there is a new directory structure that apps are to conform to. > >Looking further out there is some very exciting new stuff coming in GR for handling packet-oriented streams with timed transmission features. This looks like it should be a good fit for our repeater work, but will require effort to make use of the new capability. > >Finally, we're interested in P25 phase II, and are looking for RF captures of various phase II scenarios. > >Best > >Max > >--- In op25-dev(a)yahoogroups.com, Steve Glass <stevie.glass@...> wrote: >> >> Hi Everyone >> >> I think its time to organize a drive to move the code to the latest version >> of GNURadio. The OP25 codebase is suffering badly from bit rot and that >> needs fixing. GNURadio has evolved and developed many new features we've >> not properly kept up with. Fixing the codebase will mean that we can get >> people working with much less hassle than at present. >> >> I've created a wiki >> page<http://op25.osmocom.org/wiki/wiki/ReengineeringPage>to act as the >> starting point. I shall start opening tickets this week and >> start mapping out the direction of the exercise. For now I want to focus >> the effort on the core OP25 components and we can use GRC as our top-level >> test harness. Take a look and take part in the discussion. >> >> Atb >> >> Steve >> > > > > >------------------------------------ > >Yahoo! Groups Links > > >

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Updating the OP25 codebase
by Steve Glass 08 Mar '13

08 Mar '13

Hi Everyone I think its time to organize a drive to move the code to the latest version of GNURadio. The OP25 codebase is suffering badly from bit rot and that needs fixing. GNURadio has evolved and developed many new features we've not properly kept up with. Fixing the codebase will mean that we can get people working with much less hassle than at present. I've created a wiki page<http://op25.osmocom.org/wiki/wiki/ReengineeringPage>to act as the starting point. I shall start opening tickets this week and start mapping out the direction of the exercise. For now I want to focus the effort on the core OP25 components and we can use GRC as our top-level test harness. Take a look and take part in the discussion. Atb Steve

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AttributeError: 'module' object has no attribute 'fsk4_slicer_fb'
by md123＠nycap.rr.com 08 Mar '13

08 Mar '13

using the command in terminal: cd ~/src/op25/python ./audio_p25_rx.py -a i get this error: Using Volk machine: ssse3_32 Traceback (most recent call last): File "./audio_p25_rx.py", line 1044, in <module> app = stdgui2.stdapp(p25_rx_block, "APCO P25 Receiver", 3) File "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/stdgui2.py", line 38, in __init__ wx.App.__init__ (self, redirect=False) File "/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7981, in __init__ self._BootstrapApp() File "/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7555, in _BootstrapApp return _core_.PyApp__BootstrapApp(*args, **kwargs) File "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/stdgui2.py", line 42, in OnInit self._max_noutput_items) File "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/stdgui2.py", line 64, in __init__ self.panel = stdpanel (self, self, top_block_maker, max_nouts) File "/usr/local/lib/python2.7/dist-packages/gnuradio/wxgui/stdgui2.py", line 86, in __init__ self.top_block = top_block_maker (frame, self, vbox, sys.argv) File "./audio_p25_rx.py", line 97, in __init__ self.__init_gui(frame, panel, vbox) File "./audio_p25_rx.py", line 298, in __init_gui self.slicer = op25.fsk4_slicer_fb(levels) AttributeError: 'module' object has no attribute 'fsk4_slicer_fb' can anybody help me with this error please?

3 8

Sample P25 files
by md123＠nycap.rr.com 07 Mar '13

07 Mar '13

Hi guys! Does anyone know where i could find some sample p25 files to test op25 with? Thanks, Matt --------------------

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