Calculation of DSB SC power in AM signal

Calculate the power in a DSB SC signal when the modulation is 60% with a carrier power of 600W.

a.) 600W
b.) 540 W
c.) 108 W
d.) 300W

Correct Answer: c) 108 W


The total power in an AM is given by
Pt= Pc ( 1 + m2/2)
Given: m= 0.6
Therefore DSB power= (m2/2)Pc
= 600* (0.6)2/2
= 108 W
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