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Radioteletype (RTTY) is a telecommunications system consisting of two
teleprinters linked by a radio link.
RTTY used a variety of different modulation methods, of which frequency
shift keying was the most common. The coding used was the 5-bit Baudot code,
also known as IA2, which was used asychronously with start and stop bits.
RTTY was not fast by modern standards; a typical baud rate for RTTY
operation was 75 baud.
The combination of low baud rate with robust FSK modulation made RTTY highly
resistant to most forms of radio interference, second only to Morse code.
RTTY is still in practical use today (2001): see the link to German weather
broadcasts (RTTY at 50 baud using FSK) below. RTTY systems are also fielded
by radio amateurs.