[TowerTalk] Helically wound verticals

[Bill Coleman]

On Jun 4, 2006, at 5:44 PM, Tom Osborne wrote:

> 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.

I once made a helically wound vertical for 40m by taking a half-wave  
of wire and winding it on a 2x4. Matching was accomplished by tapping  
the first dozen or so turns and using a seriles capacitor.

It worked, but not well. A modest inverted L would be way more  
efficient than a helically wound vertical.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901