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