Radioteletype (RTTY) is a telecommunications system consisting of two or more teleprinters, or more recently personal computers (PCs) using software to emulate teleprinters, using radio as the transmission medium.

The term radioteletype is used to describe:

• either the entire family of systems connecting two or more teleprinters, or more recently PCs using software to emulate teleprinters, over radio, regardless of alphabet, link system or modulation,

• or specifically the original radioteletype system, sometime described as "Baudot".

{play}http://www.pa4rm.com/attachments/072_rtty_45.45.mp3{/play} RTTY 45,45 test sample