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<blockquote data-quote="Bajasur" data-source="post: 798705" data-attributes="member: 387635">A very interesting project!If you want to check the accuracy of you &quot;as built&quot; petal extension, there are a couple of ways you can do it.Lawrence Mayes&nbsp; published an excellent article on parabolic antenna pattern making using a graphical approximation excel sheet (graphical calculus).His procedure calculates both the parabolic curve to any accuracy you specify (step length) and the generation of the petal surface area pattern (great for unsupported surface areas)._http://vzone.virgin.net/ljmayes.mal/var/parabola.htmthe embedded downloadable excel sheet is used for the calculations.For the parabolic arc:Cut the parabolic form out of a sheet of thin plywood and use it as a guide to check the parabola.For the parabolic surface:Cut surface area petals from construction paper or other thin, flexible material and tape them on the antenna.&nbsp; If the design is correct, each paper petal will exactly&nbsp; meet at their edges.&nbsp; Any gaps or overlaps, indicate a construction error.</blockquote>

[QUOTE="Bajasur, post: 798705, member: 387635"] A very interesting project! If you want to check the accuracy of you "as built" petal extension, there are a couple of ways you can do it. Lawrence Mayes published an excellent article on parabolic antenna pattern making using a graphical approximation excel sheet (graphical calculus). His procedure calculates both the parabolic curve to any accuracy you specify (step length) and the generation of the petal surface area pattern (great for unsupported surface areas). _http://vzone.virgin.net/ljmayes.mal/var/parabola.htm the embedded downloadable excel sheet is used for the calculations. For the parabolic arc: Cut the parabolic form out of a sheet of thin plywood and use it as a guide to check the parabola. For the parabolic surface: Cut surface area petals from construction paper or other thin, flexible material and tape them on the antenna. If the design is correct, each paper petal will exactly meet at their edges. Any gaps or overlaps, indicate a construction error. [/QUOTE]

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