PSK31 is an amateur radio communications mode introduced by Peter Martinez, G3PLX, that uses phase modulation and special character coding. It allows robust narrow bandwidth keyboard "Chat" type communications between two or more stations.

WinPSK evolved while experimenting with DSP on a PC soundcard. This program was not intended to be a full-featured program for serious PSK31 use, but rather as a learning tool for those interested in the "inner workings" of a functional PSK31 program. This program, it's source code, and a companion document "WinPSK Technical Reference Manual", should be of some use for someone who wants to improve upon and create a full featured version.

Please report any bugs/problems/comments/, to me at ( mailto:ae4jy@mindspring.com )The program is free, so support will be a function of available time and desire on my part. Good luck!

• The file WinPSK11.zip (445K) contains all the files needed to run the WinPSK program as well as online help. All the files should be placed in the same directory, (C:\mydirectory\) for example. No setup program needs to be run.

• The file WinPSKUser10.PDF (357K) is a user guide explaining how to use the program. This information is the same as the online help.

• The file WinPSKTech10.PDF (334K) is a technical reference manual that discusses many of the design details of the program.

• The Visual C++ 6.0 project source code for WinPSK is here WinPSKsrc11.zip (112K). This code is now released as public domain software with absolutely no support or warranty of any kind.

• A Spanish Help File WinPSK-es.zip (230K) is now available thanks to the hard work of Paulí Núñez, EA3BLQ.

Fixed FFT amplitude scaling problem

Fixed Fast DemoMode CPU %use bug

Fixed "About Box" text problem

Added Narrow AFC mode after Transmit to reduce freq drift

Added Setup links to Window's Mixer audio level control

Changed CW ID speed/spacing

Added Local Time option

Fixed missing characters at end of TX

Made AFC smoother

Fixed screen maximize restoration problem

Fixed UTC date problem

Fixed problem if Tune button was double clicked

Changed CW ID spacing

Fixed display zoom problems

Fixed(by removing) the memory resource display problem.

Fixed problem of version number in registry key

Changed FFT size to 2048 making updates faster(.37 Sec)

Zoom limit reduced to 10

Removed useless signal views(3D,I/Q,eye,large vector)

Rewrote waterfall display for 10x speedup, made color, and bigger

Changed test mode to demo mode and added fast option

Added option to turn off tx text echoing in rx window

Removed QPSK lsb mode box and moved lsb select into setup

Increased macro text size to 2K

Placed Macro title text on button and made button larger

Changed UTC time/date format

Added means to measure and adjust soundcard clock frequency

Added an input overload message to spectral displays

Added CPU too slow message in signal displays