Explain the meaning of amplitude modulation, Electrical Engineering

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a. Explain the meaning of amplitude modulation? Show that the AM output having two sidebands and the carrier frequency.

b. Illustrate that the equivalent parallel impedance of a tuned circuit is its equivalent resistance for noise

c. Describe Co-channel and Adjacent channel interference in radio receivers. Also compare wideband and narrow band FM.

d. Define Armstrong frequency modulation system with block diagram.

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