ON4UN's book on low band DXing has a great section on deltas. Very
informative and clearly written.
73, Jerry W5KP
----- Original Message -----
From: <n4kg@juno.com>
To: <TOWERTALK@contesting.com>; <ve9aa@nbnet.nb.ca>
Sent: Sunday, September 09, 2001 7:16 AM
Subject: Re: [TowerTalk] Delta Loop Polarization
>
> On Sat, 8 Sep 2001 "Mike & Coreen Smith" <ve9aa@nbnet.nb.ca> writes:
> > Hi Tom (et al)
> >
> > Always enjoy reading your posts.
> >
> > My Delta loop as I recall is Vertically polarized. I fed it partway
> > (I think 1/8WL(?)--been 9 years since I crawled into the thick trees
> and
> > installed> it) along the bottom edge.
>
> Vertical polarization of a Delta Loop results when you feed it
> 1/4 WL down from the apex on one SIDE. Each side is .33 WL.
>
> Horizontal polarization of a Delta Loop results when you feed it
> at the Apex OR in the middle of the Bottom Wire.
>
> Offsetting the feedpoint from either of these configurations results
> in both horizontal and vertical components.
>
> Feed impedance is typically around 100-120 ohms and can
> be matched to 50 ohms through a 1/4 WL (electrical) length
> of 75 ohm coax such as RG-59.
>
> Tom N4KG
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