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Name the type of waves which are used for the 5 line of slight (LOS) communication. What is the range of their frequencies ? A transmitting antenna at the top of a tower has a height of 20 m and the height of the receiving antenna is 45 m. 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» Solution : SPACE wave 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 = 20 m` and height of RECEIVING antenna, `h_R = 45 m`. Then, maximum distance between the two ANTENNAS, `d_m= SQRT(2Rh_T) + sqrt(2Rh_R)` `implies d_m= sqrt( 2 xx 6.4 xx 10^(6) xx 20) + sqrt( 2 xx 6.4 xx 10^(6) xx 45)` ` 2 xx 8 xx 10^(3) + 3 xx 8 xx 10^(3)` `=40 km` |
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