what does FM, MW mean
Best Answer: FM is frequency modulation, that is the information is sent by varying the frequency (the wave amplitude never changes.) MW (medium wave) and LW (long wave) are AM (amplitude modulation) - the information is sent by varying the amplitude, but keeping the frequency the same.M broadcasting is in the 88-108 MHz band. AM (Amplitude Modulation) is typically used at frequencies below VHF (but not limited to that). AM radio amplitude modulates the carrier signal. AM broadcast radio operates in the 500 KHz - 1.5 MHz frequency band.