Question
What does the term 'LOS communication' mean? Name the types of waves that are used for this communication. Give typical examples, with the help of suitable figure, of communication systems that use space wave mode propagation.
Solution
Mode of radio wave propagation by space waves, in which the wave travels in a straight line from transmitting antenna to the receiving antenna, is called line-of-sight (LOS) communication.
Two types of waves used for LOS communication are space wave and ground wave.
At frequencies above 40 MHz, LOS communication is essentially limited to line-of-sight paths.
The diagram below shows various communication systems that use space wave mode of propagation.
