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| READABILITY |
| 1 |
Unreadable.
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| 2 |
Barely readable, occasional words distinguishable.
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| 3 |
Readable with considerable difficulty.
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| 4 |
Readable with practically no difficulty.
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| 5 |
Perfectly readable.
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| SIGNAL STRENGTH |
| 1 |
Faint signals barely perceptible.
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| 2 |
Very weak signals.
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| 3 |
Weak signals.
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| 4 |
Fair signals.
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| 5 |
Fairly good signals.
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| 6 |
Good signals.
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| 7 |
Moderately strong signals.
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| 8 |
Strong signals.
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| 9 |
Extremely strong signals.
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| TONE |
| 1 |
Sixty-cycle ac or less, very rough and broad.
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| 2 |
Very rough ac, very harsh and broad.
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| 3 |
Rough ac tone, rectified but not filtered.
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| 4 |
Rough note, some trace of filtering.
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| 5 |
Filtered rectified ac but strongly ripple-modulated.
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| 6 |
Filtered tone, definite trace of ripple modulation.
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| 7 |
Near pure tone, trace of ripple modulation.
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| 8 |
Near perfect tone, slight trace of modulation.
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| 9 |
Perfect tone, no trace of ripple or modulation of any kind.
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