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.
RTTY is still in use today (2001): see the link to German weather broadcasts (RTTY at 50 baud) below.
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