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May 5th 06, 02:32 PM posted to rec.radio.amateur.antenna

Cecil Moore

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4:1 balun question

wrote:
I would assume that because the feedline current is common-mode (the
same in both conductors), it will usually travel at the velocity factor
of a wire in air rather than the feedline velocity factor, though I do
not know this.

Seems like a reasonable assumption given skin effect and the
outside braid of the coax. Common-mode current also, no doubt,
forms standing waves with current minimums and maximums 1/4WL
apart. A choke would be most effective at a standing wave
common mode current maximum point.
--
73, Cecil http://www.qsl.net/w5dxp

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