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sky wave СУЩ.

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sky wave ТЕЛЕКОМ.

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Within this region, no signal can be received because, due to the actual conditions of the local ionosphere, the relevant sky waves are not reflected but penetrate the ionosphere. en.wikipedia.org

Covered are topic such as wavelength, frequency, nature and propagation of radio waves; ground and sky waves; skip distance; and fading. en.wikipedia.org

At distances of several hundred km the reflected signal (termed the sky wave) is stronger than the direct signal (termed the ground wave). en.wikipedia.org

Sky wave propagation occurs in the waveguide formed by the ground and ionosphere, each serving as reflectors. en.wikipedia.org

At shorter distances, only the first hop sky wave is of importance. en.wikipedia.org

This increases the distance to the mush zone where the ground wave and sky wave are at similar strength at night. en.wikipedia.org

During the times of sunrise and/or sunset, there is sometimes a phase gain or loss of 360 because of the irreversible behavior of the first sky wave. en.wikipedia.org

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