Question

A carrier wave of frequency 100 MHz is frequency modulated by a sinusoidal wave of amplitude 20 volts and frequency 100 KHz. The frequency sensitivity of the modulator is 25 KHz/V.
(a) Determine the approximate bandwidth of FM signal using Carson’s rule.
(b) Determine the bandwidth of transmitting only those side frequencies whose amplitude exceed the 1% of the unmodulated carrier amplitude. Use the universal curve for this calculation.
(c) Repeat your calculations, assuming that the amplitude of the modulating signal is doubled.
(d) Repeat your calculations, assuming that the frequency of the modulating signal is doubled.​

Answer 1

Answer:

0 volts and frequency 100 KHz. The frequency sensitivity of the modulator is 25 KHz/V.

(a) Determine the approximate bandwidth of FM signal using Carson’s rule.

(b) Determine the bandwidth of transmitting only those side frequencies whose amplitude exceed the 1% of the unmodulated carrier amplitude. Use the universal curve for this calculation.

(c) Repeat your calculations, assuming that the amplitude of the modulating signal is doubled.

(d) Repeat your calculations, assuming that the frequency of the modulating signal is doubled.