When sending CW, what does a “C” mean when added to the RST report?
Chirpy or unstable signal✓Bonne réponse
Report was read from an S meter rather than estimated
100 percent copy
Key clicks
Explication
Letters appended to the RST report describe defects in the signal, and C reports a chirp: the transmitter frequency shifting as the key is closed, usually a power supply or oscillator problem. K is the separate letter used for key clicks.