AM/FM the Difference

FM radio works the same way that AM radio works. The difference is
in how the carrier wave is modulated, or altered. 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 direction) of the carrier signal is
varied.
FM signals have a great advantage over AM signals. Both signals
are susceptible to slight changes in amplitude. With an AM broadcast,
these changes result in static. With an FM broadcast, slight changes in
amplitude don’t matter — since the audio signal is conveyed through
changes in frequency, the FM receiver can just ignore changes in
amplitude. The result: no static at all.
 

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