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(a) Give three reasons why modulation ...

(a) Give three reasons why modulation of a message signal is necessary for long distance transmission.
(b) Show graphically an audio singal, a carrier wave and an amplitude modulation wave.

Text Solution

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Three regions are following:
(i) Modulation allows us to send a singal over a bandpass frequecny range.
(ii) To allow the use of a smaller antenna.
(iii) In ratio communication, modulation is needed in the transmission system to transfer the message into the available high freqeuncy radio channel.
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