Question: An AM modulator has output x c (t) = 40 cos [20(200)t] + 5 cos[2(180)t] + 5 cos[2(220)t] Determine the modulation index and the efficiency.

An AM modulator has output

xc (t) = 40 cos [20π(200)t] + 5 cos[2π(180)t] + 5 cos[2π(220)t]

Determine the modulation index and the efficiency.

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