Question

Is it necessary for a transmitting antenna to be at the same height asthat of the receiving antanna for line of sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover, if the receiving antena is at the ground level?

Answer 1

Answer:

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Answer 2

• It is not necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line of sight communication.

• As in this type of communication, the only thing needed to be taken care is that no obstacles should come between transmitting and receiving antenna.

• Service area covered, if the receiving antenna is at the ground level is :

• Given : Height of transmitting antenna, h = 81 m = .81 m and radius of earth = 6.4×10^6 km

• We know that,

d = √2Rh

d = √2×6.4×10^6×81

• Also, area covered is

A = πd^2

A = π×2×6.4×10^6×81

• A = 3258