Bill VanAlstyne wrote:
Well, went back to the books and restudied the section on common-mode
currents on feed lines, and it appears that such currents are only caused
when a balanced driven element is fed with an unbalanced feeder. Since (if I
understand it correctly) the gamma match excites the driven element only on
one side, there is no way for the antenna to couple common-mode currents
into the feed line.
If you bring the coax feedline off parallel to one of the driven elements,
it will certainly couple common-mode currents into the feedline.
--
73, Cecil
http://www.qsl.net/w5dxp
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