tetra April 2012

tetra@lists.osmocom.org

3 participants
5 discussions

TETRA test samples
by Dieter Spaar 01 Feb '13

01 Feb '13

Hello, there is now a test sample (bit file) with speech at http://tetra.osmocom.org/trac/wiki/Test_Samples Please only add samples to this page if you have the full agreement for publishing from all involved parties (e.g. operator of the network, people speaking during the capture). This is not the place to share captures which were made from someone else without their knowledge. Best regards, Dieter -- Dieter Spaar, Germany spaar(a)mirider.augusta.de

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issues with GNURadio 3.6.1 ?
by sinager＠tarapippo.net 04 May '12

04 May '12

Hi, are you aware of problems with that? >>> gr_fir_ccc: using 3DNow!Extsample rate: 1024000Using Volk machine: sse3_32>>> gr_fir_ccf: using 3DNow!Traceback (most recent call last): File "./src/demod/python/tetra-demod.py", line 67, in <module> my_top_block().run() File "./src/demod/python/tetra-demod.py", line 54, in __init__ verbose=options.verbose) File "/home/sinager/osmo-tetra/src/demod/python/cqpsk.py", line 266, in __init__ self.receiver=gr.mpsk_receiver_cc(arity, pi/4.0,AttributeError: 'module' object has no attribute 'mpsk_receiver_cc' Works fine with 3.6.0 on myu netbook so I'm not sure if it's a release issue or I simply have something screwed on the main pc.Cheers S

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April 25, 7pm / Regular Osmocom meeting in Berlin?
by Harald Welte 23 Apr '12

23 Apr '12

Hi all! This is the announcement for the 2nd incarnation of our bi-weekly Osmocom Berlin meeting. April 25, 7pm @ CCC Berlin, Marienstr. 11, 10113 Berlin The schedule is as follows: 19:00 Introduction into the TETRA base station located @ CCCB For quite some time, there is a full TETRA base station located in the Berlin CCC, consisting of two base radios (BR), a site controller (TSC), an auto-tuning cavity combiner and other equipment. The talk will introduce the architecture of the system and the current status of getting it running. 20:00 Presenting the CC32RS512 / towards an Osmocom Card OS The CC32RS512 is a flash-based smart card controller to which the documentation is available without NDA. This means that we finally are able to implement a Smart Card OS (COS) as free software. 20:30 Informal discussions If you are interested to show up, feel free to do so. There is no registration required. If the initial part is not interesting to you, feel free to join us later at 20:30. The meeting is free as in "free beer", despite no actual free beer being around ;) 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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please help
by Hannu Hiltunen 17 Apr '12

17 Apr '12

has anybody succesfully get rtl chipset working? i tried it with every tetra signal and it always says cannot "find suggestive training sequence" approx 1 sec interval signal levels are good.tried with many different amp/antenna compination. and changed filter settings but no change.and with rtl-sdr it seems that it doesent change gain at all.

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rtl-sdr+tetra
by Hannu Hiltunen 04 Apr '12

04 Apr '12

i can demodulate tetra good but minimum samplerate i can do is 1msps at 3ghz double core cpu is 100% in use.so i want to demodulate it with lower value. when i try lower value example 192ksps it doesent work.so im asking any workarounds?im using noxon dab/dab+"fc00013" is it rtl chip that cannot do under 1msps?and on gnuradio under 1msps fft is very slow but 1+ its normal.

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tetra April 2012