An audio signal of 2.8 kHz modulates a carrier of frequency deviation of 56 kHz. Calculate.
(i) frequency modulation index (ii) frequency range of FM wave.

Explanation

(i) Here, `f_(m)=2.8kHz, f_(c)=84MHz, delta=56kHz` , Frequency modulation index=`m_(f)=(delta)/(f_(m)) =(56)/(2.8)=20`(ii)Here, `f_(m)=2.8kHz, f_(c)=84MHz, delta=56kHz`, Frequency range of FM wave =`f_(c)+-f_(m)= (84+-2.8xx10^(-3))=84.0028MHz and 83.9972 MHz`