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NCERT Class XII Chapter
Communication Systems
Questions With Solutions

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Question : 4
Total: 8
Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for the line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover if the receiving antenna is at the ground level?
Solution:  
No, for line of sight communication, the two antenna may not be at the same height.
A = πd2 = π (2hR) =
22
7
 × 2 × 81 × 6.4 × 106
= 3258.5 × 106 sq. metre = 3258.5 sq. km
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