PSK31 or "Phase Shift Keying, 31 Baud" is a popular computer-soundcard-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequencies in the high frequency amateur radio bands (near-shortwave). PSK31 is distinguished from other digital modes in that it is specifically tuned to have a data rate close to typing speed, and has an extremely narrow bandwidth, allowing many conversations in the same bandwidth as a single voice channel. This narrow bandwidth also concentrates the RF energy in a very narrow bandwidth, allowing relatively low-power equipment (25 watts) to communicate globally using the same skywave propagation used by shortwave radio stations. (Wikipedia)
read more from WA5AOI

A good explanation of PSK31 in German.

For connecting computer with rig:
Step by step documentation connecting FT-817 and Rigblaster and configuration of FLDIGI

Connect your smart phone or your tablet with Wolphi-Link !

Tigertronics SignaLink
To avoid changing internal jumpering while working with different riggs see special cables by QRP Project.

Data mode communication on the Yaesu FT-817
Data modes settings on the Yaesu FT-817
FT-991 setup for digital modes (with only a USB cable)

See also my FT-8 page for more information about connection between computer and radio.

"The PSK and Digital Interface Handbook" provides a lot of information, schemas and explanations to this difficult topic (by

A unique PSK transceiver, Version 2 described by Steven Weber, KD1JV.


OE1GPA Homepage
Digital Modes

Dial Frequencies


FLDIGI Download
(all platforms)

MultiPSK (F6CTE)

Who has read me ? (map)