Describe briefly three factors which justify the need for modulation of audio frequency signals over long distances in communication.

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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