Topband: Ground Screens - Another Small Space Option

[PaulKB8N at aol.com]

Rudy's latest article on small vertical efficiency for 600M,  published 
this July, is very timely and reinforces some of the discussions  we've had.  
Read and enjoy!
 
_http://rudys.typepad.com/files/600m-verticals-part-2-1.pdf_ 
(http://rudys.typepad.com/files/600m-verticals-part-2-1.pdf) 
 
Paul, K5AF
 
 
 
In a message dated 9/26/2012 9:27:01 A.M. Central Daylight Time,  
zr at jeremy.mv.com writes:



>> 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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UR RST IS ... ...  ..9 QSB QSB - hw? BK