M17 compatible radio built using RTL-SDR/HackRF and GNU Radio.
M17 - SDR & GNU Radio
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12-01-2019, 05:06 PM
Have you made this/are you making this?
12-01-2019, 06:58 PM
I'm working on it. I think SQ3SWF is trying too.
12-02-2019, 09:23 AM
Sorry for double-posting, but if anyone is familiar with GNU Radio - please stand up
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12-03-2019, 11:23 AM
I've been meaning to learn GNUradio, maybe this is my motivation.
12-12-2019, 05:24 AM
Been busy with work lately but had some time to start learning GNURadio and sketching out a flowgraph
At the moment all it does is encode audio to raw Codec2, transmit it as 4FSK symbols over FM, simulate a noisy channel, and demodulate it back into bits. Currently missing: Framing that would let me plug those bits back into Codec2 and get audio out of it. When I manually find the correct offset it decodes fine, though, even down to some pretty low SNRs (constellation diagram is basically just 4 pinprick dots even down to 10dB SNR or so). I expect this to get worse with higher symbol rates, but it's a pretty good start. I wager that with ECC we should be able to get quite acceptable decode performance down to 4-5 dB SNR. It would probably be a good idea to design the function that accomplishes framing and ECC in the M17 codebase, to also work as a GNURadio plugin so that it doesn't need to be written twice and we can be assured that what we are simulating is actually reality.
12-14-2019, 11:55 AM
Can you provide (attach) a .grc file? I have received a HackRF One yesterday and gonna play with it.
EDIT: [img width=300]https://i.imgur.com/Qq6CX1B.png[/img][img width=300]https://i.imgur.com/E0vDcpD.png[/img][img width=300]https://i.imgur.com/nhiDAsC.png[/img]
10-11-2020, 01:44 PM
I'm bumping this thread.
10-16-2020, 11:05 AM
If memory serves, there was some movement on github and reddit, where u/mobilinkd was able to provide a working sample.
10-16-2020, 02:46 PM
4FSK with RRC for GNURadio 3.7 can be found here:
https://github.com/M17-Project/gr-m17/bl...SK_RRC.grc |
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