Topband: Ground Screens - Another Small Space Option

ZR zr at jeremy.mv.com
Wed Sep 26 09:29:27 EDT 2012



>> I've used screens when I needed a wide bandwidth ground system, but never
> under other conditions.
>
> Adding a screen or preferably, additional short radials at the base will 
> assist in stabilizing the resistance component of the vertical radiator 
> and capacitance across the base insulator as ground conditions change due 
> to wx, seasonal ground moisture, etc.  The stabilization effect is 
> probably more important with directional systems than it is for 
> non-directional radiators and is common in AM broadcast systems where an 
> array is sited in a flood plane.
>
> Paul, W9AC


A screen will result in much stronger radiated power where it is wanted if 
the antenna of any height is over poor ground.

Carl
KM1H 



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