Florida Amateur radio digital modesFrequency-shift keying (FSK) RTTY AMTOR / SITOR PACTOR CLOVER2000 Packet radio (Bell 103 Bell 202) M17 Multiple frequency-shift keying (MFSK) Olivia MFSK Contestia JT65 FSK441 JT6M WSPR FT8 Phase-shift keying (PSK) PSK31 PSK63 Q15X25 COFDM MT63 (based on PSK) Non-traditional digital modes Hellschreiber (Feld-Hell) On-off keying Continuous wave Modulated continuous wave Pulse modulation Frequency-hopping Spread Spectrum (FHSS) Direct Sequence Spread Spectrum (DSSS) AMPRNet DAPNET