This is how you define an M17 receiver in LinHT ("revived" and improved OpenHT). GNU Radio all the way from baseband to audio.

Courtesy of Andy OE3ANC. Stay tuned for more.
^SP5WWP

https://github.com/M17-Project/LinHT-hw

Transmitting 64QAM at 1.5Mbps is possible as well.
@m17_project this is amazing, thanks for sharing
@dragonhunter274 We can't wait to share photos of the PoC hardware :-) Stay tuned.