Question

Height of the receiving and transmitting antenna in communication of a signal are 245 m and 180 m respectively. Find the maximum distance between the two antennas for proper communication.

• A. 104 km
• B. 208 km
• C. 52 km
• D. 96 km

Answer 1

Answer: (A)

104 km

Answer 2

Hence the correct option is (A). 104 km
Maximum distance = $\sqrt{2Rh_r}+\sqrt{2Rh_r}$
$=\sqrt{2\times 6400\times10^3 \times180}+\sqrt{2\times 6400 \times 10^3\times245}$
$=104000\,m=104\,km$