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Question

(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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Solution

(a) (i) Size of the antenna or aerial is about λ4. So if modulation is not done, the required antenna size will go in kilometers which is impractical.

(ii) Effective power radiated by an antenna is proportional to (1λ)2.

(iii) Mixing up of signals from different transmitters.
Audio signal :
Carrier wave:

Amplitude modulated wave:


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