With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency (the number of times each second that the current changes ...

"FM" broadcasting, invented in the early 1930s, uses frequency modulation ... With its wider broadcast range, especially at night, AM radio can be heard by a larger audience, with some listeners ...

This time around he’s helping out a friend who is a ham radio enthusiast. The friend’s radio didn’t come with a frequency display ... radio has a very large range of operation, [Todd ...