Radioteletype (RTTY) is a telecommunications system consisting originally of two or more electromechanical teleprinters in different locations, later superseded by personal computers (PCs) running software to emulate teleprinters, connected by radio rather than a wired link. Radioteletype evolved from earlier landline teleprinter operations that b...
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http://en.wikipedia.org/wiki/Radioteletype
Radioteletype is a broadcast mode that uses FSK to form letters, numbers, and special characters for display on a printer or video monitor.
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http://www.probertencyclopaedia.com/browse/GR.HTM
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