Question: Q. 5. (i) Write the factors that prevent a baseband signal of low frequency to be transmitted over long distances.
(ii) What is to be done to overcome these factors ? Draw a block diagram to obtain the desired signal.
R] [CBSE SQP 2016 ]
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Solution:
Ans. The factors that prevent a baseband signal of low frequency to be transmitted over long distances are :
(i) Size of the antenna
Effective power radiated by the antenna
Mixing up of signals from different transmitters
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(ii) Modulation of the baseband signal of low frequency overcomes above problems and transmit them over long distances.
Block diagram of amplitude modulation
$$ A_{c} \sin \omega_{c} t $$
