M17 RF Protocol
From Signal Identification Wiki
The M17 RFRadio Frequency Protocol is an open source digital radio mode developed for amateur radio applications and experimentation. The air interface is designed to transmit digital voice and data with a rate of 3200 bits/sBits per second (bps), modulated with square root raised cosine filtered 4FSK4-Level Frequency Shift Keying at 9600 bits/sBits per second (bps) and 9 kHzKiloHertz (kHz) 10^3 Hz wide channels.