User:Chidambaram 22

FM wave cannot be transmitted to long distances because of two reasons. 1)The power level of any transmitted signal depends on amplitude of the signal. Thus in AM, where the amplitude of carrier is varied to vary the power level of transmission (P=VI). But, in FM this is not possible since the amplitude of carrier remains constant after modulation. 2)FM wave falls under VHF(Very High Frequecy)Band of frequencies. The frequency have the tendency to travel short distance similar to line-of-sight communication.