PSK31

(Phase Shift Keying with 31 Baud and 75 Hz bandwidth)

PSK31 is a digital operating mode for text transmission. PSK31 allows a communication speed of about 50 words per minute. The signal is coded and decoded by the PC soundcard using a special program. The type of modulation (phase shift modulation) allows to operate with a very low bandwidth, in the order of 75 Hz. This way, far distance communication (over 5000 km) becomes possible using low power output (5 to 10 W).
PC with soundcard, PSK31 decoder program and a shortwave receiver
Listen to a PSK31 signal