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What is line of sight propagation?

  • A.Propagation by scattering from turbulence in the troposphere
  • B.Propagation along a clear direct path between two antennas
  • C.Propagation guided along the surface of the earth between them
  • D.Propagation returned to earth by the ionised upper atmosphere

Answer: B

A line of sight path is one in which the direct ray, with adequate Fresnel clearance, reaches the receiver without obstruction, and it is the basis of microwave links, satellite paths and most mobile coverage near a base station. Surface guidance, ionospheric return and scatter are separate mechanisms with their own bands and behaviours. Establishing which mechanism applies before predicting anything is the first step in every propagation problem.

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