Which of the following is a disadvantage of FM compared with single sideband?
Voice quality is poorer
Only one signal can be received at a time✓الإجابة الصحيحة
FM signals are harder to tune
FM signals are more susceptible to high SWR
الشرح
FM receivers exhibit the capture effect: the stronger of two signals on the same frequency suppresses the weaker one entirely, so only one can be heard at a time, while on SSB several signals in the passband are all audible at once. FM voice quality is generally better rather than poorer, and FM is easier to tune, so those choices are wrong.