Ham Radio USA - RST Signal Reports R-S-T
CharacteristicsReadability
RStrength
STone
T (cw)1 Unreadable Faint signals, barely perceptible Sixty cycle a.c or less, very rough and broad 2 Barely readable, occasional words distinguishable Very weak signals Very rough a.c., very harsh and broad 3 Readable with considerable difficulty Weak signals Rough a.c. tone, rectified but not filtered 4 Readable with practically no difficulty Fair signals Rough note, some trace of filtering 5 Perfectly readable Fairly good signals Filtered rectified a.c. but strongly ripple-modulated 6 N/A Good signals Filtered tone, definite trace of ripple modulation 7 N/A Moderately strong signals Near pure tone, trace of ripple modulation 8 N/A Strong signals Near perfect tone, slight trace of modulation 9 N/A Extremely strong signals Perfect tone, no trace of ripple or modulation of any kind
