This is merely a historical archive of years 2008-2021, before the migration to mailman3.
A maintained and still updated list archive can be found at https://lists.osmocom.org/hyperkitty/list/tetra@lists.osmocom.org/.
Ari Kaspari ari.kaspari at googlemail.comHi 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? 2012/12/17 Felix Rublack <frubi at frubi.net> > Hi Ari, > > On 17.12.2012 10:37, Ari Kaspari wrote: > > In your Picture > > > http://tetra.osmocom.org/trac/graphviz/caf863214dab2ac9e1beead8b122318020ecb403.dot.png > > 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? > > No, i don't think so. Your radio scanner does FM demodulation. But the > TETRA signal is modulated with Pi/4-DQPSK (or QAM - not supported by > osmocom-tetra). So the real information is already lost, when it comes > out of the discriminator output. > > The FUNcube Dongle (linked schematics) does no demodulation. It just > digitise the I/Q-Data and puts it in the left/right channel of the PCM > stream. > > Greetings > Felix > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/tetra/attachments/20121217/e5539055/attachment.htm>