Digital Decoding Modes
BPSK-31	Binary Phase-Shift Keying at 31 baud.	A narrowband PSK protocol resistant to noise. Most often used with SSB. Probably the most popular PSK mode for informal conversations. (˜60Hz bandwidth)
BPSK-63	Binary Phase-Shift Keying at 63 baud.	A narrowband PSK protocol resistant to noise. Faster than PSK31 but not as popular. (˜160Hz bandwidth)
FT8	A ham radio weak signal protocol using 8-FSK modulation. (50Hz bandwidth)	🔗 SIGIDWIKI FT8
FT4	A ham radio contesting protocol using 4-GFSK modulation. (83 Hz bandwidth)	FT4 was derived from FT8. 🔗 SIGIDWIKI FT4
JT65	So named because it uses 65 tones.	Limited to 13-character messages. Originally designed for EME, i.e. Moonbounce on the VHF/UHF and microwave bands. 🔗 SIGIDWIKI JT65
JT9	A 9-FSK modulation protocol useful under weak-signal conditions. Optimized for the HF and MF bands.	🔗 SIGIDWIKI JT9
WSPR	Weak Signal Propagation Reporter	FSK with a small frequency shift at a slow rate. Intended for probing potential propagation paths.
FST4	Uses 4-GFSK modulation.	Optimized for 2-way QSOs on the LF and MF bands.
FST4W	Uses 4-GFSK modulation.	Used for quasi-beacon transmissions of WSPR-like messages. Optimized for 2-way QSOs on the LF and MF bands.
Q65	WSJT Q65 (65-tone FSK) audio to digital protocol. Used for EME, ionospheric scatter and other weak-signal modes on VHF/UHF and microwave bands.	🔗 K5ND page on Q65
Packet	Phase-Shift Keying at 1200 baud.	🔗 SIGIDWIKI Packet
AIS	Automatic Identification System (Aeronautical and Maritime)	Marine Traffic Control System 🔗 USCG AIS
CW Decoder	Morse Code decode to text.
RTTY-170	Radio TeleTYpe using a 170-Hz mark-space shift.	🔗 SIGIDWIKI RTTY
RTTY-140	Radio TeleTYpe using a 140-Hz mark-space shift.	🔗 SIGIDWIKI RTTY
SSTV	Slow-Scan TV	🔗 SIGIDWIKI SSTV
Fax	Facsimile image broadcast.

An excellent source of information on signal characteristics is the "Signal Identification Guide" at 🔗 SIGIDWIKI.COM

---