Hi Glenn,
What you're describing is a Self Contained Vertical
(SCV) antenna. It uses the basic delta loop
configuration but is fed part way up the side of one
of the legs. They're (mostly) vertically polarized
and produce the same low angle radiation as a vertical
and they don't require radials (hence the name).
L.B. Cebik, W4RNL has published a series of articles
on the design and feeding of SCVs and it's available
on his website at:
http://www.cebik.com/scv/scv0.html
73,
Ken Alexander
VE3HLS
--- Glenn VA3DX <va3dx@sympatico.ca> wrote:
>
> I need a bit of advise.
>
> I currently use a standard Inv V on 80 meters.
> I would like to change this to a Delta Loop.
>
> I have been told the total length should be around
> 265 feet., and for vertical polarization it should
> be fed
> at the bottom corner. I have the 100 Ohm matching
> stub
> already to go etc etc..
>
> My question is this. Since the two sides of the
> antenna both
> reach into my neighbours yards on either side, (with
> their
> permission ) I hesitate somewhat on running the
> feedline
> to those points.
>
> Currently the Inv V is fed at the top of the tower,
> at 70'.
> If I lengthen the Inv V across the bottom to the
> required
> length and thus make a Delta Loop., what sort of
> polarization would I expect to see if it is fed at
> the top
> of the tower ?????
>
> The hardline and antenna switch unit is already up
> there,
> so this would simplify things somewhat.
>
> My interest is in DX , contesting, and a low takeoff
> angle.
> Local ragchewing is not a priority.
>
> Thanks for any thoughts... Glenn VA3DX
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