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Tonna 9 element 70cm yagi - feed method?
"Richard Ferryman" wrote in message ... I have come by a Tonna 9 element yagi for 430MHz to 440MHz. The driven element is a folded dipole and has an n-type connector attached. SWR looks correct and it works but there is a slight skew to the radiation pattern. The n-type connector is potted in a plastic or epoxy and looks too small to have any sort of balanced to unbalanced device in it. I intend putting a ferrite choke on the feed cable to help. Tonna antennas have a good reputation and I am surprised at the apparent feed method. Does anyone know if I have missed something? Dick G4BBH Hi As far as I remember F9FT ,designer of those antennas, was not convinced of the usefullness of balancing devices for long yagis . He said that the slight skew was the only real drawback of not using any . I believe you are on your own to prove he was wrong :-) --- news://freenews.netfront.net/ - complaints: --- |
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