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[TowerTalk] Re: insulated elements

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Subject: [TowerTalk] Re: insulated elements
From: (Frank Donovan)
Date: Thu, 29 May 1997 23:00:04 -0400 (EDT)
Hi Steve!
I insulate ALL of my Yagi elements with Grade LE phenolic!  My rationale
is simple: it works!  I know... some towertalkians would prefer that I 
turn my antenna farm into a science experiment, but I'm gonna stick with a

25 years ago I had a very bad experience with unintended resonance caused
by a 3 element 20 meter beam with all metal construction mounted 10 feet
above a 40 meter full size 3 element beam with all metal construction.
The 20 meter beam totally ruined the performance of the 40M beam because
the 3 element 20M beam on a 10 foot mast looked just like a top loaded
vertical and lots of driven element energy was coupled into the top-loaded
vertical!   Insulated elements totally solved the problem, and I've used
insulated elements on nearly 100 Yagis I've built since!

I design my T-matched elements with K6STI's YO program, but the length of
the driven element must be extended aproximately five percent relative to
the length predicted by YO.


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