Question

Name the type of waves which are used for the 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 x 10⁶ m)

Answer 1

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 =45 m.} Then, maximum distance between the two antennas,

d_m =√2Rh_{T +} √2Rh_R