A 50 MHz sky wave takes 4.04 ms- to reach a receiver via re-transmission from a satellite 600 km above earth’s surface. Assuming re-transmission time by satellite negligible, find the distance between source and receiver. If communication between the two was to be done by Line of Sight (LOS) method, what should size and placement of receiving and transmitting antenna be?

Given,

Height of satellite,


Let the distance from the transmitter to the satellite be x and the distance between the receiver and the transmitter be 2d.



Let us find x.





Using PGT,






Distance between the source are receiver


We also know that



where hT and hR are the height of the transmitting and receiving antenna


respectively.


Here, and








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