What is a common cause of overmodulation of AFSK signals?
Excessive numbers of retries
Excessive frequency deviation
Bit errors in the modem
Excessive transmit audio levels✓Correct answer
Explanation
AFSK is produced by feeding audio tones into an SSB or FM transmitter, so driving that audio input too hard pushes the transmitter past its linear range or past its deviation limit. The result is distortion products and splatter on both sides of the wanted signal.