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Ham Radio USA - RST Signal Reports
R-S-T
Characteristics
Readability
R
Strength
S
Tone
T (cw)
1UnreadableFaint signals, barely perceptibleSixty cycle a.c or less, very rough and broad
2Barely readable, occasional words distinguishableVery weak signalsVery rough a.c., very harsh and broad
3Readable with considerable difficultyWeak signalsRough a.c. tone, rectified but not filtered
4Readable with practically no difficultyFair signalsRough note, some trace of filtering
5Perfectly readableFairly good signalsFiltered rectified a.c. but strongly ripple-modulated
6N/AGood signalsFiltered tone, definite trace of ripple modulation
7N/AModerately strong signalsNear pure tone, trace of ripple modulation
8N/AStrong signalsNear perfect tone, slight trace of modulation
9N/AExtremely strong signalsPerfect tone, no trace of ripple or modulation of any kind