Question: Q. 7. Write three important factors which 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.
U] [Delhi I, II, IIsI 2013, Delhi I, II, III 2012]
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Solution:
Ans. (i) Practical Size of the antenna or aerial
(ii) Effective power radiated by an antenna
(iii) Mixing up of signals from different transmitters
[CBSE-Marking Scheme, 2013, 12, 10]
