[TowerTalk] Fwd: Short monopole

[Hans Hammarquist]

I only saw the 1/12th size and didn't bother to check his 480 MHz drawing. What you say make sense:" No free lunch". Well, you can always dream.

73 de,

Hans N2JFS/SM6BXX


-----Original Message-----
From: ve4xt <ve4xt at mymts.net>
To: Hans Hammarquist <hanslg at aol.com>
Sent: Sun, Sep 10, 2017 4:29 am
Subject: Re: [TowerTalk] Short monopole


Hi Hans,

I was struck by the model for 2.45 Ghz: 1/4 wavelength is just over an inch. Is there really an application for shortening something already that small?

Also, scaling his 480 Mhz model suggests a 160 m antenna would be almost 44 feet tall, with 88 feet diameter top discs. 50mm x (480/1.8) = 13,333.33 mm, or 43'8". Even out of wire, that would be no small feat. Might be worthwhile to try if modelling suggests similar behaviour based on one, two or three tophat wires, though.

73, kelly, ve4xt





Sent from my iPad

> On Sep 10, 2017, at 01:04, Hans Hammarquist via TowerTalk <towertalk at contesting.com> wrote:
>
> Gentlemen and Ladies,
>
> In the magazine "High Frequency Electronics" April 2017 issue, page 22 is an article by Hans Van Bruggen (PA3AZA) "Breaking the Monopo;y on Base-Fed Short Monopoles: Meet the CMMA". <http://highfrequencyelectronics.com/index.php?option=com_flippingbook&view=book&id=155:2017-04-april&catid=14:2017-high-frequency-electronics&Itemid=149> . I read the article and found it intriguing. The article describes how to build a very short vertical antenna still with a 50 ohms input. Knowing that it was presented in the April issue rises some concern although the article is very long to be an April fools joke, 6 pages.
>
> Has anyone else read this article and any thoughts or tests? It would be interesting to be able to build a vertical only 1/12th high for 160 meter. It would be a ~12 foot high structure.
>
> 73 de,
>
> Hans - N2JFS
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