What effect would it cause if you ran a wire around the perimeter of the
radials - connecting them together ?
And I guess you could do it again at the half-way point so it resembles a
spider-web.
like a big fence just underground.... could you then reduce the length of
the radials??
I may just try this on a manageabe scale - say 10 meters

"Richard Harrison" wrote in message
...
Steve, W9HJW wrote:
"Something like .05 wavelength (between ends of buried radials) rings a
bell, but I`m not sure."

That would depend on the length and number of radials. But, the .05
number may be significant in the case of 120 radials. 120 radials is an
FCC standard. Spacing is 3-degrees.

In a right triangle, the side opposite an angle is equal to the tanget
times the adjacent side length. For a 3-degree angle, difference between
the adjacent side and hypotenuse lengths is insignificant.

The tangent of 3-degrees is .05. The distance between radials spaced by
3-degrees is therefore very nearly .05 times the length of the radial.
That`s my guess as to the source of Steve`s .05 number.

Best regards, Richard Harrison, KB5WZI



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On Tue, 20 Jul 2004 23:26:42 -0400, "Hal Rosser"
wrote:

What effect would it cause if you ran a wire around the perimeter of the
radials - connecting them together ?
And I guess you could do it again at the half-way point so it resembles a
spider-web.
like a big fence just underground.... could you then reduce the length of
the radials??
I may just try this on a manageabe scale - say 10 meters


Hi Hal,

You would then think of the problem in terms of how far must ground
current traverse through soil to find a conductor? This is a loose
analogy because the current traveling through any patch of ground is
infinitesimal. Rather, it is the efficiency by which the radials
shield the antenna from the "bulk" of ground beneath it. Hence,
thinking of it in terms of 3D and proximity yields a better conceptual
model - further, it allows you to understand why elevated verticals
with fewer radials have an equal capacity for "getting out," or so
reports offer.

73's
Richard Clark, KB7QHC

Hal Rosser wrote:
"What effect would it cause if you ran a wire around the perimeter of
the radials - connecting them together."

That would enable and enhance current travel in circles around the
antenna base of no value to the radiated signal but a loss sink for
precious power. Ed Laport in "Radio Antenna Engineering" warns against
this "hysteresis current" product in several places and refers to it as
a "former practice". Ed had the benefit of working with Brown, Lewis,
and Epstein at RCA and used their data liberaly in his book.

Best regards, Richard Harrison, KB5WZI