Thanks JOHN
It was on K8CU website realhamradio.com
-Charlie N1RR
On Thu, Aug 20, 2020 at 10:32 PM <john@kk9a.com> wrote:
> W6QHS/W6NL created a Lotus ELEMENT spreadsheet that has a taper algorithm.
> The last time that I saw it on the internet it was free and was easy to
> convert to Excel. You can use this spreadsheet to determine the resonant
> frequency of each designed element and then input your tubing diameters
> while adjusting the tip length to obtain the same frequency. I doubt that
> there will be much length difference but it is worth checking.
>
> John KK9A
>
> Charles Morrison N1RR wrote
>
> I'm duplicating a few yagi elements made from European diameter tubing.
> I want to get it as close as I can but I dont want to model .
> I'll compensate at the tips.
> .
> Question: Which will get me closest to determining the correct
> 'equivalent'.
> Area of the cross section of the element: L X W
> -or-
> Volume of a cylinder: 2 pi r h + 2 pi r^2
>
> Half-element Example
> EU:
> Diameter 1.18" 0.987" 0.787"
> 43" 51" 32"
> US
> Diameter 1.125" 1.00" 0.875"
> 36" 68" X"
>
> Stated another way: LAWSON's Yagi Element Equivalent is closer to a surface
> area approximation or a cross-sectional area approximation ?
>
> -Charlie N1RR
>
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