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Additionally, improvements in speed can be gained from adopting variable-length codes with those codes that are used most often being the shortest. However, when sending a long run of data it is possible for the receiver to lose synchronisation. When sending asynchronous ASCII data, systems use a fixed number of data bits as well as start and stop bits. PSK31 uses a novel form of data encoding. There are various forms of PSK and the form of PSK described is actually known as binary phase shift keying, BPSK and it is more efficient than either frequency shift keying, which has a greater bandwidth, or on/off keying which does not use the power as efficiently. However, in reality the phase reversals are not achieved in this way instead they are generated and detected in the audio sections of the SSB transceiver being used. PSK involves reversing the polarity, or phase, of the signal (180° phase shifts), and has been likened to reversing or swapping over the two wires in an antenna connection. This is rather different to the frequency shift keying that is used for modes such as RTTY. PSK31 uses a form of modulation known as phase shift keying, PSK.
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It incorporates error correction techniques along with the use of a full ASCII and ANSI character set which enables it to fit in with modern day computer and telecommunications technology. PSK31 is widely used, particularly on the HF amateur radio bands where its up to date features enable it to offer advantages over modes such as RTTY. Bandwidths of 31Hz can be used, making this an extremely narrow-band mode, and one capable of operating under severe conditions. The aim is to provide an efficient yet straightforward system which does not use the complicated ARQ processes, and with only enough error correction to match the typical error rates that are encountered.Īlso, by using phase shift keying and a low data rate, it is possible to narrow the bandwidth, which considerably reduces the effects of interference and noise. This makes it a particularly attractive form of communications for radio amateurs. PSK31 is aimed at providing a greater level of performance for keyboard-to-keyboard, conversational-style data communications than is available with other data modes.
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It derives its name from the fact that it uses phase shift keying, PSK rather than frequency shift keying, and it transmits data at a rate of 31 baud.
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PSK31 is a digital mode used on the amateur radio bands. PSK31 PSK31 is a digital mode used on the HF amateur bands which provides communication in the presence of fading and interference.Īmateur Radio Digital Modes Tutorial Includes:ĭigimodes summary AMTOR RTTY PSK31 Packet radio PACTOR WSJT WSPR