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Cutoff frequency
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==Radio communications== In [[radio communication]], [[skywave]] communication is a technique in which [[radio wave]]s are transmitted at an angle into the sky and reflected back to Earth by layers of charged particles in the [[ionosphere]]. In this context, the term ''cutoff frequency'' refers to the [[maximum usable frequency]], the frequency above which a radio wave fails to reflect off the ionosphere at the incidence angle required for transmission between two specified points by reflection from the layer.
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