[Elecraft] 43' Vertical and the K2 tuner

[Steve Ellington]

So we've rediscovered the Gotham V80 Vertical!
Steve Ellington
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Ron D'Eau Claire" <ron at cobi.biz>
To: <elecraft at mailman.qth.net>
Sent: Sunday, March 15, 2009 2:21 PM
Subject: Re: [Elecraft] 43' Vertical and the K2 tuner


> Dr. Megacycle has it on the head with the length: 22 feet is 5/8 wave on 
> 10
> meters.
>
> Good "commercial" automatic tuners will feed such an antenna all the way
> down below 80 meters. The SGC-230 is commonly used on ships feeding a 23
> foot whip all the way down to the emergency SSB frequency at 2182 kHz.
>
> Many published tests have shown that getting the radials away from the
> ground is *very* beneficial and may well outweigh the loss of efficiency 
> in
> reducing the height of the vertical. Back in '87, A. M. Christman, KB8I,
> published the results of studies he conducted in the Proceedings of the
> Third Annual Review of Progress in Applied Computational Electromagnetics
> for the U.S. Naval Postgraduate School, which he later summarized for hams
> in an article in the Aug 1988 issue of QST. That article is available to
> ARRL members on their web site. It gives numerous examples of the
> improvements to be expected as various counterpoise systems are used above
> ground.
>
> Let me point out to anyone interested enough to read my previous post that 
> I
> misspoke. It was kindly brought to my attention by Arnie, PA3A, who 
> observed
> I said a half wave radiator has a high radiation resistance when I meant 
> to
> say it had a high feed point impedance. My conclusion was correct as to 
> the
> benefit of a high feed point impedance, but there's a huge difference
> between the resistive value of the feed point impedance and radiation
> resistance!
>
> Ron AC7AC
>
>
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