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Over-the-horizon or Ionospheric HF Radar OTHR On the first day the "knock-knock-knock" went on continuously for over ten hours.
Of course, strong solar activity can virtually make over-the-horizon HF radar unusable. A Spectrum Analyser display shows all the frequencies between 5 and 28 MHz.
Over-the-horizon HF radars use the ionosphere as a kind of mirror to "see" around the curvature of the earth. They have a variety of uses, both military and civilian. And they have the advantage over line-of-sight microwave radars of being able to cover enormous areas with much less power and at a fraction of the cost of the latter.
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