R-S-T system
Brevity code for Ham radio signal reports / From Wikipedia, the free encyclopedia
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For other uses, see RST (disambiguation).
The R-S-T system is used by amateur radio operators, shortwave listeners, and other radio hobbyists to exchange information about the quality of a radio signal being received. The code is a three digit number, with one digit each for conveying an assessment of the signal's readability, strength, and tone.[1][2] The code was developed in 1934 by Amateur radio operator Arthur W. Braaten, W2BSR,[3][4][5][6] and was similar to that codified in the ITU Radio Regulations, Cairo, 1938.[7]