question_answer 31)

  If the whole earth is to be connected by LOS communication using space waves (no restriction of antenna size or tower height), what is the minimum number of antennas required? Calculate the tower height of these antennas m terms of earths radius?       

Answer:

                  Let ht, be the height of transmitting antenna or receiving antenna in order to cover the entire surface of earth through communication, Fig 10(EP).4.                                   Now                                            Or                 Or                 Or  or Since space wave frequency is used so  hence only tower height is to be taken into consideration. In three dimensions of earth, 6 antenna towers each of height ht=R would be used to cover the entire surface of earth with communication programme.