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Write three important factors which justify the need of modulating a message signal. Show diagrammatically

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Write three important factors which justify the need of modulating a message signal. Show diagrammatically how an amplitude modulated wave is obtained when a modulating signal is superimposed on a carrier wave.

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(i) Practical Size of the antenna or aerial

(ii) Effective power radiated by an antenna

(iii) Mixing up of signals from different transmitters.

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