> From: Henry A Pollock <k4tmc@juno.com>
> Subject: [TowerTalk] The Ultimate (Perfect) Ground? - Think Piece
>
> Handbook, it appears that saltwater represents a ?perfect ground.? And
> right on the beach, you have a perfect ground in both the near field and
> far field. It appears that with 120 radials of 1/2 wavelength, you can
> obtain a reasonable perfect ground in the near field (re Ant. Hndbk. Chpt
> 3 - Table 1). Realizing that it would be impractical to try to obtain a
> far field perfect ground in all directions (360 degrees), what about
> trying to implement this in one direction? For those of us on the East
> Coast, 45 degrees puts one right in the center of Europe. Could it be
I tried this on 20 meters. I laid out 60 radials 250 feet long in a
45 degree sector pointed towards Europe. It produced no improvement
with a 1/4 wave vertical and 2 to 3 dB improvement (to Europe only)
for a 1/2 wave vertical. I also did simulations up to 1000 radials
500 feet long on NEC3-GS. Bottom line is that you cannot (practically)
simulate being on the beach with ground wires. Complete details are
on my web site: <<http://www.karlquist.com>> .
Rick Karlquist N6RK
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|