Question

# Write three important factors that 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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Hint : Modulation is defined as the process of varying one or more than one property of a wave with an additional modulating signal for data transmission. Now using this definition, justify the need of modulating the signal along with a diagram.

The effective power radiated by an antenna is expected to be $\dfrac{1}{{{\lambda ^2}}}$ to obtain a good signal and the size of the antenna is expected to be $\dfrac{\lambda }{4}$ .