[TowerTalk] Helically wound verticals

[ersmar at comcast.net]

Tom:

     You are likely to be disappointed with these ground-mounted verticals for FD contesting for the following reasons:

1.   FD is a domestic US (i.e., non-DX) contest for which a low dipole would work better than a vertical on 80, 40 and possibly 30M.

2.  A short, loaded vertical will not be as efficient and effective as a full-size 1/4WL radiator.

3.  I'm presuming you're going to ground-mount these verticals over a minimal ground field, resulting in even lower efficiency.

     If you want to construct something with PVC, let me suggest either a single-pole support, 30 feet tall, for two inverted V's for 80 and 40, or two guyed poles 30 feet tall to support spider-web dipoles (one common coax feedline) for all three bands.  Check out this site on NVIS antennas for ideas: http://www.w0ipl.com/ECom/NVIS/nvis.htm .  A Google or Yahoo! search will yield even more sources and info.


73 de
Gene Smar  AD3F



 -------------- Original message ----------------------
From: "Tom Osborne" <w7why at verizon.net>
> Hi All
> 
> Some years back, there was an article, I believe in QST, about some vertical 
> antennas wound on 2 pieces of pvc pipe.  They were for 40, 30 and 20.  The 
> bottom section was wound for 30/40 and you changed the top section to change 
> from 30 to 40.  There were 2 sections that were wound for 20.  This was all 
> built on a pvc pipe frame.  Can anyone steer me to that article?  I'd like 
> to make some for field day this year. Where our club picked to go (why I'll 
> never know) there are few if any trees for antennas.
> 
> If someone could scan it for me I'd sure appreciate it as I don't have many 
> QST's around any more.  Thanks and 73
> Tom W7WHY
> 
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