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Name the type of waves which are used for line of sight (LOS) communication. What is the range of their frequencies? A transmitting antenna at the top of a tower has a height of 20m and the height of the receiving antenna is 45m. Calculate the maximum distance between them for satisfactory communication in LOS mode. (Radius of the Earth `= 6.4 xx 10^(6)` m) |
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Answer» Space waves are used for the line of sight (LOS) communication. The range of their frequencies is 40 MHz and above. We have, height of transmitting antenna, `" "h_(T) = 20m` and height of receiving antenna, `" "h_(R) = 45 m`. Then, maximum distance between the two antennas, `dm = sqrt(2Rh_(T))+sqrt(2Rh_(R))` `dm = sqrt(2 xx 6.4 xx 10^(6) xx 20)+sqrt(2 xx 6.4 xx 10^(6) xx 4.5)` `" "=2 xx 8 xx 10^(3) + 3 xx 8 xx 10^(3) = 40 km`. Thus, the maximum distance between the antennas is 40 km. |
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