The antenna current of an AM transmitter is 8 A when only the carrier wave is sent but it increases to 9.19 A when carrier is modulated. Find the modulation.

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0.7

0.95

0.5

0.8

answer is D.

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Detailed Solution

Total power carried by AM wave PT=Pc1+m22 If R is load resistance Im→is current when carrier is modulated IC→is current when demodulated, then PtPc=Im2RIC2R ⇒ 1+m22=Im2RIc2R Given : Im=9.19 A , IC=8 A ∴m2=29.198.02−1 ∴m=0.8

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