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Quad and circular polarization
Dave wrote in
: -.-. --.- wrote: Greets OMs, yesterday i had a QSO with K2US - impressive antenna, by the way i'm using the station of a local OM near my QTH with a 4 elements 5 band Quad. The beautiful thing is the 9-9+20 signal around 20.45 UTC, far away in magnitude from the others stateside signals, around S5-7. So i remember my father that tell me one day in his opinion the circular polarization in the better choice... lose no matter about 6 dB, with any kind of polarization used at the other side except circular - and faraday torsion due to ionosphere - and in my mind comes 2 questions... - we take some advantage from the fact that both are using quad antenna ?? - in my non-knowledge of the facts, i have in the past believed that the quad antenna is near a circular-polarized antenna. Reading books and hearing some QSO in the air i learn that quad can be horizontal or vertical polarized, regard the feed point of the quad.. so - the circular polarization need some kind of "special" feed point or is merely a "circle" antenna ?? Apologize for the english and for the questions, maybe trivials and stupids, but i believe one esxperienced OM can say far better than 100 books. 73, CQ -.-. --.- Circular polarization means you have equal H-Pol and V-Pol radiation, with one polarization 90 degrees ahead (or behind) of the other. A quad antenna is a folded dipole. Except the top and bottom arms of a horizontally polarized quad element are far enough apart to provide some gain and to slightly lower the pattern from that of a dipole at the quad's central height. In a four or five element design this can be quite effective. I was on the far end of the QSO (at VE8ML) back in 1965 when OH8OS tested some very large quads on 15m. They were impressive. -- Dave Oldridge+ ICQ 454777283 |
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