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Why is the communication using line of sight mode limited to frequencies above 40 MHz? |
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Answer» The electromagnetic waves having frequencies above 40 MHz can not be reflected by ionosphere. Therefore, their propagation through sky wave is not possible. Such high frequency waves are heavily absorbed while progressing over the surface of earth. Therefore, their ground wave propagation is also not possible. The only way by whch such waves can propagate is the line of sight mode. |
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