What is the difference between AM and FM radio transmissions?
Both AM and FM radio signal carriers are output at a single frequency (FM is usually much higher than AM). AM (amplitude modulation) carriers alter in amplitude to mimic the audio being sent. The carrier signal frequency doesn’t alter. FM (frequency modulation) carriers alter in frequency to mimic the audio being sent. The carrier signal amplitude doesn’t alter. Receivers of either type are designed to detect those changes which are applied to the carrier signal to retrieve the audio signal.
