[TowerTalk] Re: TowerTalk Digest, Vol 17, Issue 64

[Ward Silver]

>>I read with interest the transcript of the Dayton
>>presentation by W6NL of his 2 element 40M MOXON type
>>yagi.
>>
>>http://www.kkn.net/dayton2004/W6NL_40M_MOXON_YAGI.pdf
>>
>>I wondered if anyone has thought about converting a CC
>>40-2CD (or equivalent) to the W6NL MOXON design. This
>>would eliminate the loading coils and cap hats. Maybe
>>someone has even tried this already.
>
>After a quick look at the paper and the associated .gif drawing that gave
>the tubing sizes, I couldn't help wondering about the structural soundness
>of the intersection between the elements and the loading structures, which
>involve two different sizes of element tubing and a third size in the cross
>pieces.  Dave literally wrote the book on physical design of yagis, but
>that looks like a pretty critical area.  Didn't I hear somewhere that
>NT1Y's new 80M F12 yagi failed at similar points in the elements?
>
>Maybe Dave or someone familiar with the design can explain how to properly
>fabricate that 4-way connection.  The antenna modeling results sure look
>fabulous.
>
>73, Pete N4ZR

The antenna has achieved a mechanical soundness rating of 1.0 on the Leeson
Scale - that's equivalent to the number of winters the antenna has survived
the W6NL mountaintop and come out intact.  That's a pretty good rating, so I
think the mechanical soundness has been established.  Getting a 1.0 on that
scale is no mean feat.

Actually, I'm sure Dave will have some guidance on fabrication of the
junction...

73, Ward N0AX