RSQ Quality.
The presence of additional unwanted trace modulation observed on the waterfall or spectrum indicates possible spurious emissions and provides a basis for assessing the quality of digital mode signals. The traditional RST Tone report being designed to evaluate CW signals for the presence of audible hum, key clicks, chirping, etc. is simply not relevant to digital modes. "Quality" is measured from 1 to 9.
1. Splatter over much of the spectrum
3. Multiple visible trace pairs
5. One easily visible trace pair
7. One barely visible trace pair
9. Clean signal - No visible or unwanted trace pairs