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Johann T. johann.tzt at gmail.comHi Sylvain, Thank you for your quick reply. Much appreciated! I will try your suggestions and come back to you when I have more results. Best regards, Johann On Thu, Apr 30, 2020 at 6:53 PM Sylvain Munaut <246tnt at gmail.com> wrote: > Hi Johann, > > So, first wrt to different formula, the spec is definitely right ... > (I mean it's the spec ...). > However they are narrow channels and if your B210 is not GPS > disciplined, its oscillator could be out quite a bit. It's default > xtal is only rated to +- 20ppm and that's a 30 kHz error at 1.5 GHz > ... so you can be off by a full channel just with that. > > Second, the frequency you give to gmr1_rx_sdr.py is where to tune. In > reality you want to tune not to the channel directly but a bit to the > side so that the DC offset and 1/f noise at the center of the capture > don't mess up the data. The script will automatically filter and > recenter the proper frequency depending on the -a argument you passed > to it. > > Finally that python script only does the sample and channelization, > and saves to a cfile in /tmp it doesn't do any of the decoding at all. > For that you need to also run gmr1_rx binary ( or gmr1_rx_live , see > the live branch ) on the recording. And it's that one that will take > the raw samples do all the demod and decoding of the channels and send > the data to wireshark. > > Cheers, > > Sylvain > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gmr/attachments/20200501/bdd853e7/attachment.htm>