- Unreadable
- Barely readable, occasional words distinguishable
- Readable with considerable difficulty
- Readable with practically no difficulty
- Perfectly readable
|
- Faint signals, barely perceptible
- Very weak signals
- Weak signals
- Fair signals
- Fairly good signals
- Good signals
- Moderately strong signals
- Strong signals
- Extremely strong signals
|
- Sixty cycle A.C. or less, very rough and broad
- Very rough A.C., very harsh and broad
- Rough A.C. tone, rectified but not filtered
- Rough note, some trace of filtering
- Filtered rectified a.c. but strongly ripple-modulated
- Filtered tone, definite trace of ripple modulation
- Near pure tone, trace of ripple modulation
- Near perfect tone, slight trace of modulation
- Perfect tone, no trace of ripple or modulation of any kind
|