[Antennas] Vertical

[Dr. William J. Schmidt, II]

<<For ground mounted verticals, 50 or more radials seems optimum with 130 or
more near perfection but 4 or so does work.>>

Don't  "drink the cool-aid" on this advice... do the impedance test... its 
the only way that I know of short of a full soil conductivity test and NEC4 
modeling to tell for sure!

Sincerely,

Dr. William J. Schmidt, II  K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC

Email: bill at wjschmidt.com
WebPage: www.wjschmidt.com

"It's not what you take with you... but what you leave behind that counts. 
Live each day as if it were your last."


----- Original Message ----- 
From: <Hendrid at aol.com>
To: <antennas at mailman.qth.net>
Sent: Sunday, November 27, 2005 11:44 AM
Subject: [Antennas] Vertical


> Hi Sean,
>
> Not sure how this adding a reply works, but Cebik has done a lot of 
> analysis
> and antenna testing and is a well accepted authority on hf dipoles and
> verticals.  His conclusion is that gain wise, a well made dipole in the 
> clear and
> up about 1/2 wavelength is about as good as you can do for a wire  antenna 
> or
> a vertical.  This includes versus low take off angle which  the vertical
> favors.
>
> For those of us that do not have a clear area and the capability to get a
> dipole up 1/2 wavelength, and for dx or long range communication (farther 
> than
> 1000 miles or so), the vertical or some similar antenna such as a half 
> square
> would probably be favored.  I have built and used a number of low  dipoles
> and some verticals (not very successful on verticals) over the years and
> studied what others have said and done.  An elevated vertical (base 
> elevated) seems
> to get out significantly better than a ground mounted one if 4  or more 
> also
> elevated radials are used.
>
> For ground mounted verticals, 50 or more radials seems optimum with 130 or
> more near perfection but 4 or so does work.  Also, what many vertical
> theorists and builders and users seem to neglect is the "ground plane"
> characteristics of the soil at 2 to 4 wavelengths from the base of the 
> ground  mounted
> vertical in addition to the radials at the base of the vertical.   That is 
> the
> reason that verticals are not normally recommended in the desert or  where 
> the
> soil is dry.  Verticals next to an ocean shore or a body of water  or 
> moist soil
> normally work great.
>
> Hope this helps,  Don NT7N  Grants Pass,  Oregon
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