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  4. The radius of the Earth is 6400 km. If the height of an antenna is 500 m, then its range is

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Q. The radius of the Earth is 6400 km. If the height of an antenna is 500 m, then its range is

KCETKCET 2018Communication Systems

Solution:

$d = \sqrt {2h_T R} = \sqrt{2 \times 500\times 6400000}$
$= \sqrt{10^3 \times 64 \times 10^5}$
$= 8 \times 10^4 =80\, km$