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Text File  |  1999-10-21  |  375b  |  13 lines
  1. Time differences between the receiving and transmitting stations 
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  3. Large changes in the height of the ionosphere at the receiving station ordinarily occurring shortly after either sunrise or sunset
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  5. Phase differences between radio-wave components of the same transmission, as experienced at the receiving station
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  7. Small changes in beam heading at the receiving station
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