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#10
July 6th 06, 09:46 PM
posted to rec.radio.amateur.antenna
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Voltage feeding a VHF yagi
Bob Bob wrote:
I havent but Mr Cebik talks about it on his website; http://www.cebik.com/vhf/jp4.html Cheers Bob VK2YQA wrote: Anyone ever get around the VHF FM vertical yagi feedline routing problem by voltage feeding the bottom of the driven element with a stub like a J-pole? A quick EZNEC run seems to indicate that it's not a bad idea. The problem with many models is people just stick a source at the feedpoint and assume it tells them something about how the antenna works in the real world. A model has a PERFECT source that is like using a perfect balun and a transparent feedline. I can build a very feedline critical antenna with horrible balance issues, one that will never work in the real world, and make it behave quite well in the model. I would never use a J-pole feed on a Yagi, except perhaps in a model. 73 Tom |
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