Modulation index b Df f m BW 2k f A m f m PM. Thus a station broadcasting at 1031 actually sends signals whose frequencies range from 1030 to 1032. Df 75 KHz fm 500 Hz BWFM 2 75 5001000 KHz 1510 KHz.
The fraction percentage if multiplied by 100 of the carrier amplitude that it varies by.
Angular modulation Frequency FM and Phase PM The usual expression for a harmonic signal of angular frequency w C is St cosFt cosw C t j 0. Df 75 KHz fm 500 Hz BWFM 2 75 5001000 KHz 1510 KHz. Modulation index v is used to describe the ratio of maximum frequency deviation of the carrier to the maximum frequency deviation of the modulating signal. Angular modulation Frequency FM and Phase PM The usual expression for a harmonic signal of angular frequency w C is St cosFt cosw C t j 0.