[TowerTalk] re: The Ultimate (Perfect) Ground?

[n4kg@juno.com]

For horizontal polarization, the voltage vectors are added
when in phase, thus producing a 6 dB reflection.  Even 
lossy ground is fairly efficient (4 to 5 dB) for horizontal
polarization.

For vertical polarization, current vectors are added and
ground losses become quite significant.  This is where
a salt water foreground is especially favored.

de  Tom  N4KG



On Thu, 23 Dec 1999 09:16:11 -0800 "Al Williams" <alwilliams@olywa.net>
writes:
> 
> If all of the radiated energy directed towards ground is reflected
> upwards by a "perfect salt water ground", then the skyward
> power can only be doubled--3db.  Why then is a salt water
> location so coveted?
> 
> k7puc
> 
> 
> -----Original Message-----
> From: rick@area.com <rick@area.com>
> To: towertalk@contesting.com <towertalk@contesting.com>
> Date: Wednesday, December 22, 1999 9:05 PM
> Subject: [TowerTalk] re: The Ultimate (Perfect) Ground?
> 
> 
> >
> >> 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
> >
> >--
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> >
> 
> 
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