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Re: [TowerTalk] 80m Delta loop on 70' tower

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] 80m Delta loop on 70' tower
From: Stuart Browne <stuartpbrowne@gmail.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Fri, 5 Feb 2010 08:01:51 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On switching from the horizontal to the vertical polorization, I thought
that I'd take the ladder line feed from the apex and the feed from  the
corner and run them to an old knife switch that I have, then ladder line
indoors to a 2:1 Balun...pretty basic, but it should work.

On Fri, Feb 5, 2010 at 6:06 AM, Tony Brock-Fisher <barockteer@aol.com>wrote:

> If you feed the loop at the bottom middle, it will be horizontally
> polarized, and be pretty doggy for DX  because of it's low height above
> ground.
>
> If you feed it 1/4 wave down from the top on one side, it will play much
> better for DX because it will act like a pair of phased verticals.
>
> Neat thing is as a vertical it needs no radials - the bottom leg acts as a
> counterpoise.
>
> >From a 70' tower, rig a 20' crossarm to support the tops of a pair of
> loops, and feed them simply with 75 ohm coax for matching/loading, as in:
>
>
>
> http://www.cebik.com/content/a10/wire/hsyg.html
>
>
> This is a kick butt antenna, I claim as good as a 4-square, just lacking
> the ability to switch in as many directions. I have mine set up pointing at
> EU one way, covers most of the US the other way for SS...
>
> This is such a great antenna I gave mine a rebuild after 10 years.
>
>
> -Tony, K1KP
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