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Re: [TowerTalk] Elements of a yagi

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Elements of a yagi
From: David Gilbert <xdavid@cis-broadband.com>
Date: Sat, 4 Feb 2017 11:43:56 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>


I'm pretty certain you are correct, but I question whether the effect would be significant. In any case it would be pretty easy to check with EZNEC+. Just model two stacked identical yagis and shift the coordinates of one of them forward or backward.

73,
Dave   AB7E



On 2/3/2017 10:58 AM, Bill Conwell wrote:
Is it a fair assumption that dissimilar yagis (e.g., Ed's 15m Telrex and M2)
can be phased (e.g., in a vertical 2-stack) by mounting the yagis so their
driven elements are vertically aligned?  I have an impression that it isn't
necessarily so - that the apparent phase center, if you will, for a yagi is
influenced by the coupling between the DE and other yagi elements.  Thus,
for example, a point 10 wavelengths out horizontally from a yagi's DE won't
necessarily be in phase with the DE feed point.

/Bill, K2PO

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