Question: An AM modulator operates with the message signal m(t) = 9 cos (20t) - 8 cos (60t) The unmodulated carrier is given by 110 cos(200t)

An AM modulator operates with the message signal

m(t) = 9 cos (20πt) - 8 cos (60πt)

The unmodulated carrier is given by 110 cos(200πt) and the system operates with an index of 0.8.

(a) Write the equation for mn(t), the normalized signal with a minimum value of -1.

(b) Determine {m2n(t)}, the power in mn(t).

(c) Determine the efficiency of the modulator.

(d) Sketch the double-sided spectrum of xc(t), the modulator output, giving the weights and frequencies of all components.

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