In 2019 Wojciech Kaczmarski (SP5WWP), started working on the M17 open source radio project. Since then the project has made great progress – assembling a team of Hams involved, a project website, mailing list – and steady progress on the development of the TR9 radio, the first to be built to the M17 standard.
For the RF deck, the TR9 is using the chipset approach and a RRC filtered 4FSK waveform, similar to DMR. For my own work, I like to optimise low SNR performance by building the physical layer, but I’m a bit of a modem nerd, and it complicates the RF side. Compared to a low cost SDR/custom RF design – the RF chipset approach this will get them on the air quickly, and the filtered 4FSK will have a narrow on air bandwidth (12.5kHz channel spacing). Sensitivity will be similar to analog FM/DMR radios.
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Hello from the M17 Team! Awesome to see some news about our project here, I hope we can get a lot more folks interested.
We’ve got an IRC channel that’s pretty active if anyone has questions, and a forum for those that like forums.