The RSQ System for Digital Modes

Readability

1. 0% Undecipherable
2. 20% Occasional words distinguishable
3. 40% Considerable difficulty, many missed characters
4. 80% Practically no difficulty, occasional missed characters
5. 95%+ Perfectly readable

Strength

1. Barely perceptible trace
3. Weak trace
5. Moderate trace
7. Strong trace
9. Very Strong trace

Quality

1. Splatter over much of the spectrum
3. Multiple visible pairs
5. One easily visible pair
7. One barely visible pair
9. Clean signal – no visible unwanted sidebar pairs

For more info see http://www.rsq-info.net/