Well, Jim. Then it may just be a matter of semantics.
You see the AV-640 as a Windom, I see it as a 3/8 wave Marconi monopole (
vertical ) with elevated radials. And since it is 3/8 wave, it has a high
impedance at the feedpoint which requires the matching balun.
Most importantly, the radiation patters are markedly different between the
Windom of any sort and the AV-640.
The Windom pattern looks like a Chrysanthemum Fower ( almost
omni-directional ) and the 640 is a very low angle radiator without the
"In the Beginning there was Spark Gap"
----- Original Message -----
From: "Jim Hargrave" <firstname.lastname@example.org>
To: "Tower and HF antenna construction topics." <email@example.com>
Sent: Monday, April 26, 2010 7:41 PM
Subject: Re: [TowerTalk] AV-640 (was GapChallenger ComparisonTesting
>>> So far, I have outlined several differences between 2 types of Windom
>>> the AV-640, enough to justify NOT calling it a Windom.
>>> Wouldn't you agree?
> I pass. I have never owned an AV-640, so I cannot offer a qualified
> I only pointed out that an antenna that is off center fed is commonly
> referred to as a "Windom". We normally think in terms of horizontal.
> However, I see no reason the same principal could not be applied
> Perhaps I should start calling my 17M antenna a "Vertical Windom"
> Its a 1/2 wave vertical consisting of a 3/8 wave whip mounted 6ft above
> on a steel pipe. Its fed at the top of the pipe (base of the whip).
> I use homebrewed link coupling to a 50 ohm coax.
> Since it off centered fed, I guess it the meets the same principal...
> 73 de Jim
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