MFSK16 and MFSK8

Created by : Nino Porcino IZ8BLY and Murray Greenman ZL1BPU

Description :
Baud rate : 15.625 for MFSK16 et 7.8125 for MFSK8
Speed : 42 wpm (average) (62.5 bits/sec) for MFSK16 and 26 wpm (average) (39.06 bits/sec) for MFSK8
Modulation : FSK 16 tones (4 bits) for MFSK16 and 32 tones (5 bits) for MFSK8
Reception mode: only one side (USB or LSB), USB is recommended
Character set : ASCII characters + almost all ANSI extended characters + an error reset character (“ Varicode ” characters)
Shape of pulse : rectangular
Space between tones : 15.625 Hz for MFSK16 et 7.8125 Hz for MFSK8,
Bandwidth : 316 Hz,
Demodulation : non-coherent,
Synchronization: automatic using the signal
Convolution code: R(Rate)=1/2, K (Constraint length)=7 with Viterbi type decoder
Interleaving : yes (for example, spreading of 120 bits for MFSK16)
Drift tolerance : 10 à 20 Hz/mn for MFSK16 and 4 to 7 Hz/mn according to signal-to-noise ratio,
Pmean/Ppeak : 1
Lowest S/N : -13.5 dB for MFSK16 and -15.5 dB for MFSK8