tetra November 2013

tetra@lists.osmocom.org

3 participants
4 discussions

Gnuradio 3.7.# compability?
by janne lukkarinen 01 Apr '14

01 Apr '14

So i decided i lift the cat on the table again and start poking around with some tetra signals. first i had to use dos2unix on the python files (odd i know) once it finally found python i get this 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 i poked around some with the code but i ended up causing more damage then i was fixing so i thought i ask if there will be an update anytime soon? if i understood correctly blks2 is moved into 'gr-digital' Janne Lukkarinen OH2-EKO JLxSolutions

4 3

OsmoDevCon 2014 / Date / Venue
by Harald Welte 01 Jan '14

01 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)

1 1

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 (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

1 0

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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tetra November 2013