FREQUENCY MODULATION
radio modulation techique where
information (usally voice or music) is added to
the signal and changed by varying the freqeuncy of the
transmitter. FM is the most commonly used modulation for radio signals techneque above 30 MHz.
the term "FM" is also used to refer to the broadcast band from 88.1 to 107.9 MHz, using that same modulation mode.