RST code
Sep 22, 2015
The RST 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] The code was developed in the 1934 by Amateur radio operator Arthur W. Braaten, W2BSR.
-From Wikipedia
RST Signal Reports | |||
---|---|---|---|
Value | Readability | Strength | Tone (CW only) |
1 | Unreadable | Faint signals, barely perceptible | Sixty cycle a.c or less, very rough and broad |
2 | Barely readable, occasional words distinguishable | Very weak | Very rough a.c., very harsh and broad |
3 | Readable with considerable difficulty | Weak | Rough a.c. tone, rectified but not filtered |
4 | Readable with practically no difficulty | Fair | Rough note, some trace of filtering |
5 | Perfectly readable | Fairly good | Filtered rectified a.c. but strongly ripple-modulated |
6 | - | Good | Filtered tone, definite trace of ripple modulation |
7 | - | Moderately strong | Near pure tone, trace of ripple modulation |
8 | - | Strong | Near perfect tone, slight trace of modulation |
9 | - | Extremely strong | Perfect tone, no trace of ripple or modulation of any kind |