I have read W2PV's yagi antenna design book many times and there is
certainly a lot of useful information in it. However, I believe that his
yagi designs are not optimum. He used equal spacing between the elements
and newer designs use closer spacing for the reflector and first director to
improve bandwidth. Since the boom is 90 degrees from the antenna, I don't
see how it effects the pattern. Also unless you are using insulated
elements, you need to add the elements to the boom to determine it's
resonate frequency.
John KK9A
To: towertalk@contesting.com>
Subject: Re: [TowerTalk] Yagi designs?
From: "jeremy-ca"
Date: Thu, 19 Jul 2007 17:25:49 -0400
List-post: <mailto:towertalk@contesting.com>
Nothing beats the W2PV designs for gain or F/B especially over just the CW
band. With 4 elements on 40/27/20 foot booms for 20/15/10M the wind load is
less than designs with more elements. The booms are non resonant on any of
those bands so stacking interference is minimized allowing closer spacing.
Ive used them singly or in stacks since 1983.
Carl
KM1H
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