Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves?(a) 10 kHz(b) 10 MHz(c) 1 GHz(d) 1000 GHz
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Solution
It is necessary for the signal wave to travel large distances for beyond-the-horizon communication using sky waves. Frequency of 10kHz requires very large antennas. The high energy signal waves (1GHzto1000GHz) penetrate the ionosphere.
Thus, signal waves of 10MHzfrequencies are most suitable for beyond-the-horizon communication because they easily get reflected from the ionosphere.