m17project.org Opensource replacement for Digital Voice modes 4 FSK raw 4.8 kBaud 1/2 convolutional coder xor with PRBS 9 QPP bit interleaver 9.6 kb/s 1/2 4.8 kb/s cats.radio Modern replacement for the APRS packet mode 2 FSK raw 9.6 kBaud 1/2 LDPC labrador-rs xor with LFSR 10 32 bit matrix interleaver 9.6 kb/s 1/2 4.8 kb/s github.com/do3rb OSI Network over ISM Transceivers at fullspeed 2FSK raw 115.2 kBaud 1/2 Golay FEC with RLL mod provides whitening byte wise interleavable 115.2 kb/s 1/2 57.6 kb/s