Radioteletype
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Radioteletype is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations connected by radio rather than a wired link. Radioteletype evolv
Tuning indicator on cathode ray tube
Punched tape of the type used with teleprinters in a Creed model 6S/2 5-hole paper tape reader
Electronic RTTY terminal, c. 1980
PSK31
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PSK31 or "Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-t
Radioteletype
…spectral efficiency. The typical RTTY signal with 170 Hz shift at 45.45 baud requires around 250 Hz receiver bandwidth, more than double that required by PSK31. In theory, at this baud rate, the shift size can be decreased to 22.725 Hz, reducing the overall band footprint substantially. Because RTTY, using…
A waterfall display depicting several PSK31 transmissions at around 14.07 MHz. The green lines indicate a station that is transmitting.
Frequency spectrum of an ideal non-splattering PSK31 signal