A) to reduce the time lag between transmission and reception of the information signal
B) to reduce the size of antenna
C) to reduce the e fractional band width, that is the ratio of the signal band width to the centre frequency
D) to increase the selectivity.
Correct Answer: A
Solution :
Low frequencies cannot be transmitted to long distances. Therefore, they are super imposed on a high frequency carrier signal by a process known as modulation. Speed of electro-magnetic waves will not change due to modulation. So time lag between transmission and reception of the information signale.
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