tetra

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162 discussions

OsmoDevCon 2014 / Date / Venue
by Harald Welte 02 Jan '14

02 Jan '14

Hi all, time is moving fast, and I want to start some initial discussion and planning for OsmoDevCon 2014. There are basically four questions which I'm raising below. Please provide your feedback to the osmocom-event-orga mailing list only, to avoid cross-posting over all the project lists. = Who? = My intention is to keep it an 'active developer/contributer only' event, like we had it before. I would also want to keep the group relatively small, to keep the 'Osmocom family' atmosphere. If desired, we could have one half or full day of public prsentations in a larger auditorium, but the developer meeting should be a close group, as known so far. = Where? = If we keep the number of attendees within the same range as this year, then I'm sure we could again hold it at the same venue. I know it is not perfect, but it is a place that we have access to, 24 hours per day, and free of cost for community projects like osmocom.org. If the community wants a larger event, then this is something that would require more funds and much more time organizing. And that is something that I personally could not offer to take care of, sorry. I'm happy to attend and support any larger events, but I'm unable to take care of fundraising and venue research. = When? = Q1/2014. In January, I'm not aware of any 'blocker' events. February, there is Fosdem (Feb 1 + Feb 2), and MWC from Feb 24 through Feb 27. In March there is CeBIT (March 10-14) and Easter holidays (with EasterHegg March 17-21). Did I miss any other FOSS / mobile event that might clash in Q1? So my preference woudl be to do it either late January (23-26) or in February (6-9 or 13-16). Any preferences regarding preferred schedule? Once we have some concencus here on the list [and we want to do it in the same size / venue], I'll talk to IN-Berlin. = What? = I think that question is easy to answer, if we have the above three figured out... There's no shortage of topics, I suppose. You can start adding your suggestions to http://openbsc.osmocom.org/trac/wiki/OsmoDevCon2014 Regards, Harald -- - Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

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tetra_tdma
by Graham Palmer 31 Dec '13

31 Dec '13

Hi all Just an enquiry. Has anyone managed to add hyperframe number to tetra_tdma.c file and if so could you let me know. Many thanks' Graham.

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Realtime receiving live tetra signal;
by Furkan Elibol 27 Nov '13

27 Nov '13

Hi Folks, I have a sample tetra signal without encryption. I generate a test signal from the tetra sample with a vector signal generator.(@394MHz carrier and 96KHz sampling rate) I try to receive and listen this test signal realtime with USRP N200 and osmocom tetra. I combine all the osmocom tetra parts in one script (seen below) but speech is not continuous and aplay gives underrun warnings. The cpu usage is approximately %30 and there is no memory or disk write/read speed problem. I wonder what is the problem and how can i listen realtime tetra speech. I also test demodulator offline and then try the rest of the script realtime and there is no problem, i can listen continuous speech without any gap. So i suspect from the demodulator performance.. I am using Ubuntu 12.04 64bit, Gnuradio 3.6.5.1, UHD 003.005, SSD disk, 8GB Ram, Intel i7-3520M CPU. Thanks.. ------------------------------------------------------------------ #!/bin/bash sudo sysctl -w net.core.wmem_max=1048576 sudo sysctl -w net.core.rmem_max=50000000 rm /tmp/out.float /tmp/out.bits /tmp/out.codec /tmp/out.pcm /tmp/traffic.out mkfifo /tmp/out.float mkfifo /tmp/out.bits mkfifo /tmp/out.codec mkfifo /tmp/out.pcm mkfifo /tmp/traffic.out ~/Desktop/osmo-tetra/src/demod/python/uhd-tetra_demod.py -f 394E6 -o /tmp/out.float & float_to_bits /tmp/out.float /tmp/out.bits & tetra-rx /tmp/out.bits & cdecoder /tmp/traffic.out /tmp/out.codec & sdecoder /tmp/out.codec /tmp/out.pcm & aplay -fS16_LE /tmp/out.pcm rm /tmp/out.float rm /tmp/out.bits rm /tmp/out.codec rm /tmp/out.pcm ------------------------------------------------------------------ Furkan Elibol PhD Candidate Ozyegin University

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Realtime receiving live tetra signal;
by Furkan Elibol 26 Nov '13

26 Nov '13

Hi Folks, I have a sample tetra signal without encryption. I generate a test signal from the tetra sample with a vector signal generator.(@394MHz carrier and 96KHz sampling rate) I try to receive and listen this test signal realtime with USRP N200 and osmocom tetra. I combine all the osmocom tetra parts in one script (attached) but speech is not continuous and aplay gives underrun warnings. The cpu usage is approximately %30 and there is no memory or disk write/read speed problem. I wonder what is the problem and how can i listen realtime tetra speech. I also test demodulator offline and then try the rest of the script realtime and there is no problem, i can listen continuous speech without any gap. So i suspect from the demodulator performance.. I am using Ubuntu 12.04 64bit, Gnuradio 3.6.5.1, UHD 003.005, SSD disk, 8GB Ram, Intel i7-3520M CPU. Thanks.. ------------------------------------------------------------------ #!/bin/bash sudo sysctl -w net.core.wmem_max=1048576 sudo sysctl -w net.core.rmem_max=50000000 rm /tmp/out.float /tmp/out.bits /tmp/out.codec /tmp/out.pcm /tmp/traffic.out mkfifo /tmp/out.float mkfifo /tmp/out.bits mkfifo /tmp/out.codec mkfifo /tmp/out.pcm mkfifo /tmp/traffic.out ~/Desktop/osmo-tetra/src/demod/python/uhd-tetra_demod.py -f 394E6 -o /tmp/out.float & float_to_bits /tmp/out.float /tmp/out.bits & tetra-rx /tmp/out.bits & cdecoder /tmp/traffic.out /tmp/out.codec & sdecoder /tmp/out.codec /tmp/out.pcm & aplay -fS16_LE /tmp/out.pcm rm /tmp/out.float rm /tmp/out.bits rm /tmp/out.codec rm /tmp/out.pcm ------------------------------------------------------------------ Furkan Elibol PhD Candidate Ozyegin University

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fcdp-tetra_demod.py error with Gnuradio 3.7.2 news
by fe8769 19 Sep '13

19 Sep '13

hello I have the following error running fcdp-tetra_demod.py ./170913/src/demod/python/ fcdp-tetra_demod.py -D hw:1 -o /dev/stdout | ./170913/src/float_to_bits /dev/stdin /dev/stdout | ./170913/src/tetra-rx /dev/stdin Traceback (most recent call last): File "./170913/src/demod/python/fcdp-tetra_demod.py", line 5, in <module> from gnuradio import gr, gru, audio, eng_notation, blks2, optfir ImportError: cannot import name blks2 In Gnuradio 3.7 Block blk2 has been replaced by digital - if the block replaced then the following error occured : then optfir can't be opened --> optfir is reference to optfir.py or optfir.pyc ? If I remove optfir , I have error with sound card access and this : in line 83 tb = my_top_block(options)is also with erreur --

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fcdp-tetra_demod.py error with Gnuradio 3.7.2
by fe8769 17 Sep '13

17 Sep '13

Hello I have the following error running fcdp-tetra_demod.py ./170913/src/demod/python/fcdp-tetra_demod.py -D hw:1 -o /dev/stdout | ./170913/src/float_to_bits /dev/stdin /dev/stdout | ./170913/src/tetra-rx /dev/stdin Traceback (most recent call last): File "./170913/src/demod/python/fcdp-tetra_demod.py", line 5, in <module> from gnuradio import gr, gru, audio, eng_notation, blks2, optfir ImportError: cannot import name blks2 Gnuradio is 3.7.2 Liboscomore has been download from git clone git://git.osmocom.org/libosmocore.git no error in Gnuradio liboscomore , Tetra-rx installation Saw that Gnuradio has different blocks structures and a programm to migrate from 3.6.51 to 3.7 Thanks for answer

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Encrypted TETRA Networks ?
by Dieter Spaar 10 Sep '13

10 Sep '13

Hello, is anybody aware of encrypted TETRA networks which are not run by the government or police ? I am especially interested about Germany, as far as I am aware all the TETRA networks which use encryption here are the BOS networks. There are of course several networks which use authentication, but no encryption. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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which GnuRadio?
by sinager＠tarapippo.net 21 Aug '13

21 Aug '13

Hi,I successfully compiled and used Osmocom Tetra at its very first releases then left it aside for a while.I was now trying to rebuild it on my freshly reinstalled pc but I see it has not been updated to run on the current GR 3.7. Updating the "import" section was easy, but now I'm facing some errors (filter definitions in I reckon) beyond my expertise.Any hint on the most recent version of GR Osmocom-Tetra will run on? Thanks Stefano

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nokia/eads thr 880i
by labad jala 01 Aug '13

01 Aug '13

Hi folks, do anyone on the list have information/programming software for the Nokia EADS thr880i? Regards.

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Audio Sample for ETSI decoder
by Vitor Espíndola 26 Jul '13

26 Jul '13

I'm starting development of an audio tetra codec for our critical communications platform based on ETSI c-code. Did you have any samples that I can use as example for ETSI C-Code decoder? Thank you, -- Vitor Espíndola

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