RST Signal Report

R
Readability		 S
Strength		 T
Tone (cw)
  1. Unreadable
  2. Barely readable, occasional words distinguishable
  3. Readable with considerable difficulty
  4. Readable with practically no difficulty
  5. Perfectly readable
  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
  1. Sixty cycle a.c or less, very rough and broad
  2. Very rough a.c., very harsh and broad
  3. Rough a.c. tone, rectified but not filtered
  4. Rough note, some trace of filtering
  5. Filtered rectified a.c. 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