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RTTY is Radio TeleTYpe, or radio teleprinter, often pronounced "ritty".  Originally, it required teleprinters as used on the international public Telex service and private systems used by the military.  Teleprinters had allegedly "soundproof" covers but were still one of the noisiest mechanical devices available.  They were replaced by computers sending and receiving the RTTY data code.

The UK standard speed for Telex and RTTY is 50 Baud, which translates to a maximum of 66.6 words per minute.  That is only twice as fast as a reasonable Morse Code transmission sent by a human.  For a machine or computer, it is very slow.

Amateur Radio data modes

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Page updated on 09 January 2017

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