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Q. 2. (a) Describe briefly three factors which justify the

need for modulation of audio frequency signals

over long distances in communication. (b) Draw

the waveforms of (i) carrier wave, (ii) a modulating

signal and (iii) amplitude modulated wave.

 

Q. 3. (a) Give three reasons why modulation of a

message signal is necessary for long distance

transmission. (b) Show graphically an audio

signal, a carrier wave and an amplitude modulated

wave.

 

 

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