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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