RY (test signal)

RY (test signal)

RYRYRYRY... is a character string that was widely used to test a five-level teleprinter or RTTY channel. The characters "R" and "Y" are Boolean complements of each other in 5-bit ITA2 code, also known Baudot. Switching between the two characters was a stressful test for electromechanical teleprinters. Repeated over and over, "RYRYRYRY..." outputs a carrier wave that regularly and rapidly shifts back and forth in frequency. It also provided a test for signal polarity; if polarity was reversed, the test signal would print as "SG". [http://www.ominous-valve.com/digital.txt]

The corresponding string of complementary characters in 7-bit ASCII is "U*U*U*U*..."


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