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@arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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