| level |
READABILITY |
| 1 |
unreadable |
| 2 |
barely readable |
| 3 |
readable with considerable difficulty |
| 4 |
readable with almost no difficulty |
| 5 |
perfect readable |
| level |
SIGNAL STRENGTH |
| 1 |
faint signal (s) barely perceptible |
| 2 |
very weak signal(s) |
| 3 |
weak signal(s) |
| 4 |
fair signal(s) |
| 5 |
fairly good signal(s) |
| 6 |
good signal(s) |
| 7 |
moderately strong signal(s) |
| 8 |
strong signal(s) |
| 9 |
extremely strong signal(s) |
| level |
TONE (CW Morse only) |
| 1 |
sixty-cycle ac 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 |