What is RTTY?

RTTY (Radio TeleTYpe) is a method of using tones to send digital messages between radios in amateur HF bands (and other services). While it has been around for many years, these days it usually involves using a computer and modulation/demodulation software to send/receive messages. You can send messages with RTTY using several coding methods e.g. Baudot, Amtor, simple ASCII, etc. To transmit these tones, you'll modulate the characters using AFSK (audio frequency shift keying) or FSK (frequency shift keying).


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