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Quad and circular polarization
"Richard Fry" wrote in message ... On Nov 29, 2:18 pm, Roy Lewallen wrote: Jerry wrote: Just for conversation, I submit that an antenna with good hemispheric CP coverage could be made with 4 dipoles. Yes, there's the quadrifilar helix which I believe fits that description. Another, which I built decades ago at 450 MHz, is the "skew planar" antenna which resembles a cloverleaf but with the "leaves" rotated 45 degrees... Getting back to Jerry's idea - yes, four linear dipoles can generate nearly perfect omnidirectional c-pol. This is a design of Nils Lindenblad many decades ago, and I've done some NEC-2 modeling of it. The link below leads to a rendered view of that model. http://i62.photobucket.com/albums/h8...adRendered.gif RF Hi Richard The Lindenblad is Omniazimuth CP. The QHA is hemispherical CP. Some explanation of the DCA is shown in the Feb 2008 QST. Jerry |
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