tetra December 2012

tetra@lists.osmocom.org

7 participants
6 discussions

TETRA test samples
by Dieter Spaar 02 Feb '13

02 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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decrypt voice traffic
by Media 24 Dec '12

24 Dec '12

Is there someone who is succeeded decrypt voice traffic?

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Osmocom TETRA software
by Ari Kaspari 18 Dec '12

18 Dec '12

Hello, i found your brilliant project yesterday and asked me, if it is possible to use a signal from a radioscanner discriminator output for your omso-tetra tool. In your Picture http://tetra.osmocom.org/trac/graphviz/caf863214dab2ac9e1beead8b122318020ec… it seems to me, that I only need PCM Samples from my radioscanner. Thus I think i can stream the discriminator output via soundcard (PCM-Samples) into a linux pipe and use this pipe for your omso-tetra tool. Is this possible? Or is my radioscanner not possible to "stream" the correct channel pattern? Best Regards Ari Kaspari

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Question again without error in email
by Ari Kaspari 18 Dec '12

18 Dec '12

Hi thank you for your comment. What do you think about the following thought: I take two old radioscanners each has 12.5 kHz channel pattern ("Kanalraster") , Tetra uses 25 kHz. Then I make for each scanner a FM modulation in Software or on FPGA and after a signal addition. Now i should have the modulated Pi/4-DQPSK signal back. Or haven’t I?

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TETRA-RX on AR5000
by fe8769 10 Dec '12

10 Dec '12

hello I can't understand why tetra-rx won't work with my configuration : AR5000 -->output 10.7 Mhz -->DJX11 in IQ mode then sound card I have a nice graph as same as using DJX11 but no decode This previous configuration is working with standard windows SDR software with DMRdecode any idea thanks --

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Fix some uglyness
by Frank A. Stevenson 02 Dec '12

02 Dec '12

Attached is a patch that fixes some global ugliness. The dependencies are a bit iffy, so you need a make clean after applying this. This fix needs to be in place before you decode multiple carriers. I would like to suggest that tetra-rx.c be changed so that it can receive multiplexed streams of input. Byte values of 0 / 1 will be the primary stream, but other values can be used to encode the multiplexed streams. The easiest method is to use the high order bits of the input as a "stream id", and dynamically create new state structs as they appear in the stream. Does this sound like a decent solution ? f

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tetra December 2012