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Which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?

Which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters? Correct Answer 12 GHz

Beyond 12 GHz the horizon terrestrial communication is not reliable without repeaters.

Additional InformationTerrestrial Microwave:

  • It is a technology that transmits the focused beam of a radio signal from one ground-based microwave transmission antenna to another antenna.
  • These are unidirectional waves, whereas the sending and receiving antenna is to be aligned which means the antennas are narrowly focused.
  • The repeaters can be installed on the earth or sometimes satellites can be used as repeaters, which receive and retransmit the signals. 

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