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CW Morse Code RST Table

R Readability
1 Unreadable 
2 Barely readable, occasional words distinguishable
3 Readable with considerable difficulty
4 Readable with practically no difficulty
5 Perfectly readable
S Signal Strength
1 Faint signals, barely perceptible
2 Very weak signals
3 Weak signals
4 Fair signals
5 Fairly good signals
6 Good signals
7 Moderately strong signals
8 Strong signals
9 Extremely strong signals
T Tone
1 Sixty cycles or less, very rough and broad
2 Very rough ac, very harsh and broad
3 Rough ac tone, rectified but not filtered
4 Rough note, some trace of filtering
5 Filtered rectified ac, but strongly ripple-modulated
6 Filtered tone, definite trace of ripple modulation
7 Near pure tone, trace of ripple modulation
8 Near perfect tone, slight trace of modulation
9 Perfect tone, no trace of ripple, or modulation of any kind
HTX-242 Ham Radio
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