tetra

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162 discussions

small patch for float_to_bits and tetra-rx

by ciaby

This patch just convert read/write into fread/write, which are buffered and a bit faster... (actually, quite a lot faster) :-) It works, have been tested at the CCC, and allow osmo-tetra to run in real-time on a crappy Atom CPU. Btw, if you like to run the entire decoding chain in real-time, just do this (assuming that you use the funcube dongle): cd src/demod/python mkfifo out.float mkfifo out.bit ./fcdp-tetra_demod.py -D hw:1,0 -c <offset> -o out.float //(normally the fcdp runs on the second alsa port, change it to the appriopriate one). ../../float-to-bits out.float out.bit ../../tetra-rx out.bit I'm still not 100% sure about the speech decoder, but i don't have any good sniffer dump with speech traffic to test it, i will let you know in a week or so... Happy hacking! :-) Ciaby P.S. I have a plan to convert the float-to-bits code into a proper GNU Radio module, shouldn't be too difficult, is there any interest into continuing this project? As I understood Harald is quite busy with other stuff (and rightfully so), but I think that we should move forward. Volunteers? ;-)

13 years, 10 months

alternative to funcubedongle?

by Mccauley

After difficulty buying the funcubedongle i think i have found a possible alternative piece of hardware. Maybe even works better than FCD given a lot of people is reporting that the dongle is sensitive to overloadis sensitive to overload. It's a traditional radio-scanner receiver that provide a built in I/Q output for use with SDR software. http://www.thiecom.de/alinco-dj-x11.html http://www.hamradioscience.com/2011/06/alinco-dj-x11t-review/ Given I/Q connected to sound card, ¿would this work directly with fcdp-tetra_demod.py? -- <>

13 years, 10 months

osmo tetra

by toto titi

hello from France Great job you did for Tetra decode . I have a request concerning : ./src/float_to_bits /tmp/out.float /tmp/out.bits | ./src/tetra-rx /tmp/out.bits where can I find float_to_bits ? where can I find tetra-rx ? thanks for answer best regards -- fe8769(a)operamail.com -- http://www.fastmail.fm - Faster than the air-speed velocity of an unladen european swallow

13 years, 10 months

Fwd: a question about Tetra

by Harald Welte

maybe somebody wants to reply... -- Sent from a mobile device, excuse my short response vahid jahandideh <vahid_jahandideh_1998(a)yahoo.com> wrote: Hi Dears This is v.jahandideh a communication engineering student. I am studding TETRA protocol and i need your help. i want to know how we can distinguish voice traffic for a specific subscriber, can we do it by extracting the AACH and then looking to the header in AACH and associating a traffic usage marker whit each individual down link conversation. or there exist another solution for this problem. I would be appreciated if could make time to reply to my inquiry. sincerely yours v.jahandideh

13 years, 10 months

speech codec

by Graham Palmer

Hi all Re: Pepijn message. I too was wondering how the u-plane data was passed to the codec. 300-395-2 states that acelp-codec requires 2 * (137+1) 16bit samples per frame and not 216 + 216 bits indicated in the tch reordering file comments. Any assistance would be greatly appreciated. Best regards. Graham.

13 years, 11 months

Speech codec

by Pepijn van den Berkhof

Hello, Can anyone give me a hint about how to use the speech codec? I have successfully patched and compiled it but I'm stuck on how to operate it. Thank you. - Pepijn

13 years, 11 months

Telecommunication and Wireless Hacking at CCC CAMP 2011

by Fabio Pietrosanti (naif)

Hi all, i just wanted to send a summary of all most cool talk that will be at CCC CAMP 2011 related to Telecommunications and Wireless Technologies hacking: Open-source 4G radio - It's time to start WiMAX and LTE hacking http://events.ccc.de/camp/2011/Fahrplan/events/4446.en.html Applied Research on security of TETRA radio - Digital radio technology beyond GSM http://events.ccc.de/camp/2011/Fahrplan/events/4496.en.html GPRS Intercept - Wardriving phone networks http://events.ccc.de/camp/2011/Fahrplan/events/4504.en.html Introduction to Satellite Communications - Installation and Operation of Satellite Systems http://events.ccc.de/camp/2011/Fahrplan/events/4442.en.html Transition Telecom - Telecommunications and networking during energy descent http://events.ccc.de/camp/2011/Fahrplan/events/4459.en.html Anyone missing to the list? -naif

13 years, 11 months

TETRAPOL Networks

by imbe

a tetrapol decoder could be soundcard based. just a soundcard and radio scanner... but only a few people around the world would be able to write some code for " TETRAPOL Decoder Project " come on folks...more support for TETRAPOL decoding ! TETRAPOL Networks are growing...

13 years, 11 months

Re: Questions osmocom TETRA project

by jmdhainaut

Hello, I know that your project OSMOCOM works for TETRA but do you think that in future it is planned to continue the experiment to TETRAPOL? Best regards Une messagerie gratuite, garantie à vie et des services en plus, ça vous tente ? Je crée ma boîte mail www.laposte.net

13 years, 11 months

TETRAPOL Networks

by imbe

>TETRAPOL is sort-of dead when it comes to new deployments, but I think >it would still be fun to experiment with it. some countries around the world have a growing TETRAPOL only infrastructure. it would be fun to decode TETRAPOL...

13 years, 11 months

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