# A carrier wave is frequency-modulated using a sinusoidal signal

# A carrier wave is frequency-modulated using a sinusoidal signal

A carrier wave is frequency-modulated using a sinusoidal signal of frequency A?m and amplitude Am.

(a) Determine the values of the modulation index Ă for which the carrier component of the FM signal is reduced to zero. For this calculation you may use the values of J0 (Ă) given in Table.

(b) In a certain experiment conducted with A?m = 1 kHz and increasing Am (starting from 0 volts), it is found that the carrier component of the FM signal is reduced to zero for the first time when Am =2 volts. What is the frequency sensitivity of the modulator? What is the value of Am for which the carrier components is reduced to zero for the second time?