Pattern Changes, etc

Dale H. Cook
Sun Feb 19 14:34:45 EST 2006

>  How is it that AM DX reception is highest at sunspot minimum?  I
>  would have thought it would be the other way around.

The F layer is responsible for night time AM DX. The frequencies best 
reflected by that layer are directly related to its ionization from 
solar flux. During solar minima the F layer best reflects medium wave 
and low short wave frequencies. During solar maxima it best reflects 
higher short wave and lower VHF frequencies.

Dale H. Cook, Chief Engineer, Centennial Broadcasting, 
Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI / WLEQ 

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