op25-dev May 2017

op25-dev@lists.osmocom.org

1 participants
6 discussions

by gregella53＠gmail.com [op25-dev]

I know that a while back there was a grc flowraph of op25 that handled DES. Any chance of a pybombs recipe for op25 that handles RC4 as implemented in Advanced Digital Privacy?

6 years, 9 months

rx.py and tdma audio

by gnorbury＠bondcar.com [op25-dev]

If anyone is experimenting with the latest Max branch and the new rx.py app, you may have noticed that phase 2 tdma audio isn't working yet. I have some quick and dirty code that implements the missing bits if anyone wishes to try it out. The three modified files can be found in my google drive: https://drive.google.com/open?id=0B-...DFrTGx4Vkh3em8 https://drive.google.com/open?id=0B-9lC78gYedOMDFrTGx4Vkh3em8 p25_frame_assembler_impl.cc p25p2_tdma.h p25p2_tdma.cc Drop them into the op25/op25/gr-op25_repeater/lib directory, perform a 'make install' (from the build directory) and then add "-2" into the rx.py command line to enable tdma decode.

6 years, 10 months

Success running OP25 with GNURadio 3.7.11 [2 Attachments]

by Alex alex323＠gmail.com [op25-dev]

Hi all, OP25 (specifically scope.py) doesn't seem to work out of the box with the latest version of GNU Radio, seemingly because it relies on deprecated components (WX widgets). Today I was able to massage the code to get it semi-functional with 3.7.11 using my own custom flow graph, which was reverse engineered from the scope.py application. When I tune it to a voice channel of a Phase I system I am able to hear audio, which I consider a success. The changes I made to the code base are located here[0], and attached to this email is my flow graph. I hope that this is helpful to people new to the project. I do have some questions though: 1. How can this flow graph be optimized? I am not a radio expert by any means, and while this flow graph works, I don't know *why* it works. Importantly, the MPSK Receiver block is deprecated and set to be removed in a future release[1], so I'd like to change it to something more idiomatic. 2. What do the veriables "beta", "gain_mu", "alpha", "gain_omega", "if_rate", and "symbol_deviation" mean? How were they chosen? Why do they work? -- Alex [0] https://github.com/centromere/op25 [1] https://github.com/gnuradio/gnuradio/issues/1083

6 years, 11 months

Re: [op25-dev] Success running OP25 with GNURadio 3.7.11

by Sean Kealy superstardodge＠yahoo.com [op25-dev]

Where could I find it again? -------------------------------------------- On Sun, 5/14/17, Alex alex323(a)gmail.com [op25-dev] <op25-dev(a)yahoogroups.com> wrote: Subject: Re: [op25-dev] Success running OP25 with GNURadio 3.7.11 To: "Sean Kealy superstardodge(a)yahoo.com [op25-dev]" <op25-dev(a)yahoogroups.com> Received: Sunday, May 14, 2017, 11:44 AM On Sun, 14 May 2017 16:24:10 +0000 (UTC) "Sean Kealy superstardodge(a)yahoo.com [op25-dev]" <op25-dev(a)yahoogroups.com> wrote: > What should I enter for the p25 frame assembler, I get a flowgraph > error for this block > Are you using my fork of OP25? -- Alex #yiv6816875129 #yiv6816875129 -- #yiv6816875129ygrp-mkp { border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;} #yiv6816875129 #yiv6816875129ygrp-mkp hr { border:1px solid #d8d8d8;} #yiv6816875129 #yiv6816875129ygrp-mkp #yiv6816875129hd { color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;} #yiv6816875129 #yiv6816875129ygrp-mkp 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6 years, 11 months

Compiling on Ubuntu 12.04, issue with libboost

by Dylan Reinhold dreinhold＠gmail.com [op25-dev]

Trying to get op25 on a new latop that has 12.04 (tried to install 10.04 but network drivers wont load). Installed with the : http://op25.osmocom.org/trac/wiki.png/wiki/InstallInstructionsPage First issue was math header was not found, included it in op25/gr-op25_repeater/lib/gardner_costas_cc_impl.cc The with the new gcc naowing became an error so I disabled it with make CXX_FLAGS="-Wno-narrowing" Which got me to what seems to be libboost cant be linked. [ 65%] Linking CXX shared library libgnuradio-op25_repeater.so /usr/bin/ld: CMakeFiles/gnuradio-op25_repeater.dir/vocoder_impl.cc.o: relocation R_X86_64_PC32 against symbol `_ZN2gr13op25_repeater12vocoder_implC1EbbiPcib' can not be used when making a shared object; recompile with -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status op25/gr-op25_repeater/lib/CMakeFiles/gnuradio-op25_repeater.dir/build.make:593: recipe for target 'op25/gr-op25_repeater/lib/libgnuradio-op25_repeater.so' failed make[2]: *** [op25/gr-op25_repeater/lib/libgnuradio-op25_repeater.so] Error 1 CMakeFiles/Makefile2:644: recipe for target 'op25/gr-op25_repeater/lib/CMakeFiles/gnuradio-op25_repeater.dir/all' failed make[1]: *** [op25/gr-op25_repeater/lib/CMakeFiles/gnuradio-op25_repeater.dir/all] Error 2 Makefile:127: recipe for target 'all' failed make: *** [all] Error 2 Any ideas. Seems like I need to rebuild libboost? Thanks, Dylan

6 years, 11 months

Control channel questions

by Alex alex323＠gmail.com [op25-dev]

Hello, Let's say you're scanning the airwaves in the frequency range of a known P25 system and come across a spike in power at one particular band that never shuts off. * You should think that you've located a control channel, correct? * If so, is it safe to say that the upstream and downstream channels are side-by-side (one contiguous frequency band)? * What is the most accurate way of determining whether what you've discovered is a Phase I or Phase II system? * When someone keys up a radio, is the following sequence of events accurate?: 1. The radio sends a packet via the upstream control channel indicating that it wishes to speak. 2. The fixed site sends a packet via the downstream control channel indicating a frequency X on which it wants the speaker to transmit. 3. The fixed site sends a packet via the downstream control channel instructing all radios in the talk group to tune in to a frequency Y. 4. The speaker transmits on frequency X, and the fixed site acts as a repeater, re-broadcasting the audio to frequency Y. -- Alex

6 years, 11 months

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op25-dev May 2017