Define modulation index. Why is its value kept in practies, less than one ? A carrier wave of frequency 1.5 MHz and amplitude 50 V is moduclated by a sinusoidal wave of frequency 10KHz producing 50% ampitude moducation. Calculate the amplitude of the AM wave and frequencies of the side bands produced.

Define modulation index. Why is its value kept in practies, less than

1.	Define modulation index. Why is its value kept in practies, less than one ? A carrier wave of frequency 1.5 MHz and amplitude 50 V is moduclated by a sinusoidal wave of frequency 10KHz producing 50% ampitude moducation. Calculate the amplitude of the AM wave and frequencies of the side bands produced.
Answer» Frequency of carrier, ` " " f_(c)= 1.5 MHz = 1500 KHz ` Frequnency of signals,` f_(s) = 10 KHz` Modulation factor M = 50% Amplitude of carrier, ` E_(c) = 50V` The side and ferquency are : ` f_(c) -f_(s) and f_(c) +f_(s)` (1500 -10) and (1500 +5) (1490 Hz) and ( 1505 KHz) Amplitude of each sideband term, ` = (mE_(c))/2= ( 0.5 xx 50)/2 = 1.25 ` V.

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