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@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
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
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