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Atmospheric Noise Factor at HF●Noise below 30 MHz is dominated by atmosphere and man-made sourcesA) Atmospheric 99.5%tileB) Atmospheric 0.5%tileC) Man-made (Quiet)D) GalacticE) Man-made (City)At =300mF a70dBAt =100mF a50dBAt =15mF a30dBSource:ITU-R P.372-10 (2009)
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