at 2-3 wavelengths, you stop being a cloud warmer -
remember that at harmonics, the radiation begins to go in
the plane of the loop. I've used a 160 mtr horiz loop on 80
mtrs and had wonderful performance.
----- Original Message Follows -----
From: "Rob Atkinson, K5UJ" <email@example.com>
Subject: [TenTec] open wire feed/loops
Date: Fri, 03 Feb 2006 03:00:38 +0000
> I tried to find the bare copper 450 ohm open wire feed
> with the ceramic or white plastic spacers a couple of
> years ago, and after contacting 3 or 4 vendors who all
> had the plastic window line only, was finally told by
> someone that you can't get the bare copper feed anymore
> because in our world of lawsuits, it was considered too
> dangerous for anyone to use.
> The only source i know of (besides making it yourself) for
> the genuine open wire feed (i.e. not window line) is
> W7FG as someone else mentioned. This what I use, and I
> have had no problems with it, but I can't compare it to
> window line because i have never used the 450 ohm window
> line. For all I know, it may be just as good more or
> less (or better?).
> I use pvc pipes stuck in the ground and topped with T
> sections to hold my line up over the ground. It enters
> my basement at a small casement window that's 1.5 x 2.5
> feet and divided into 3 panes. I bashed out the middle
> pane and replaced it with plexiglass that I drilled two
> holes in 3" apart. I put banana jacks in these and
> terminated the line outside with plugs. this makes a
> quick disconnect for thunderstorms. on the inside I
> soldered another foot or two of line to the jacks and put
> my transmatch on a shelf in front of the window. coax
> from there to the rig. i was lucky to have a ready
> made window--it almost looks like it was put there for the
> feedline. As bob said, it's worth it to bring the line
> in some way, even if you have to hire someone to saw a
> square out and put in a window.
> I have a question about the cloud burner loops. If you
> have a low loop that's only 20' off the ground but make
> it 2 or 3 lambda on 80 m. it seems to me it will still be
> a cloud burner on that band. Is this right or will the
> length give you some lower angles?
> rob / k5uj
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