Select the signal's most prominent characteristic from each
of the R, S, and T columns in the chart. Select the number from
the R-S-T Numeral (left) column which corresponds to each
characteristic chosen. This R-S-T sequence of numbers becomes
the RST signal report.
If the signal has the characteristic stability of crystal
control, the letter X may be added to the end of the RST report.
Use the the letter C to indicate a chirp on the signal and the
letter K for key clicks.
"RST is 599" - means that the morse code cw signal being
assessed is Readability 5 (perfectly readable),
Strength 9 (extremely strong signal), Tone 9 (perfect
tone). This is the ultimate cw signal.
This reporting system may also be used for phone operation by
leaving out the Tone (T) portion of the report. For example, a
signal of "5 9" means that the phone signal is Readability
5, and Strength 9; a perfectly readable and extremely
strong signal. The term "S-9" is also used to report a
Strength 9 for an extremely strong signal. If an S-Meter is
being used as a basis of the signal report, an S-9 is the
numeric level of 9 (S-Units) on the meter.