Main Question or Discussion Point
1) I am studying modulation of carrier waves, but I still can't understand something: knowing that in AM the carrier wave has only one frequency and just only its amplitudes vary according to variations in modulating signal amplitudes, why AM carrier waves have bandwidth if the frequency is supposed to be unique? Does it have any point with variations in the modulating signal frequencies? If it does, what about simple signals with only just one frequency? Thank you all for the answers.