This page talks about the Phase Shift Keying 31 (PSK31) mode of operation.
WB8NUT Digital Information
WB8NUT has a great page that talks about all of the digital modes. On this page you can actually hear some sample sounds from each of them.
Phase Shift Keying 31 (PSK31) Information
The PSK Info page is a good place to start for information about this mode of operation.
PSK31–Has RTTY’s Replacement Arrived?
The ARRL has a good article about PSK31, and compares it to radio teletype (RTTY) protocol.
PSK31 in Wikipedia
Wikipedia has a great page that talks about this digital mode. Here you’ll find some audio samples and explanations of the encoding.
The Digipan software is free and can be used to decode the audio coming from a radio receiving PSK31 and PSK63 signals. The software creates a digital panorama of the signals received. You can even load the software, and use your computer’s microphone to listen to the incoming audio.
There is no authoritative list, as the frequencies are determined by common convention. However, here’s a list of observed operating frequencies.
|1.838 MHz||160 meters|
|3.580 MHz||80 meters|
|7.035 MHz*||40 meters (region 3)|
|7.070 MHz*||40 meters (regions 1,2 USA)|
|10.142 MHz||30 meters|
|14.070 MHz||20 meters|
|18.100 MHz||17 meters|
|21.080 MHz*||15 meters|
|24.920 MHz||12 meters|
|28.120 MHz||10 meters|
|50.290 MHz||6 meters|
* Current usage as of 2010, based on observation, is centered on 7,070.15 and 21,070.15. 7,035.15 is commonly used in Region 2 as of 2012.