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Quad and circular polarization
Jerry wrote:
Hi Roy Just for conversation, I submit that an antenna with good hemispheric CP coverage could be made with 4 dipoles. Jerry KD6JDJ 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. Although I haven't seen either one constructed at HF, on reflection I don't see any reason you couldn't. There's still the problem of ground reflection, though. I didn't state it very well in my last posting -- what I meant was that the sum of the direct and ground-reflected rays tend to produce a linearly or nearly linearly polarized wave even when you start out circular. Roy Lewallen, W7EL |
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