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September 2nd 08, 12:26 PM posted to rec.radio.amateur.antenna

Cecil Moore[_2_] Cecil Moore[_2_] is offline

Cecil Moore[_2_] is offline

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First recorded activity by RadioBanter: Mar 2007

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Baluns?

wrote:
Yes and I have to partially take back what I said; a balun CAN double
as a CM "choke" and a CM choke can double as a balun. If
one wishes to balance an unbalanced line with a CM choke, then the
impedance of the CM choke must match the source and the load, which
makes the CM choke a balun and no longer a choke :-)

Actually, a balun without a large choking impedance
is not very useful for ham antenna system applications.
The method that a W2DU balun uses to balance currents
at a dipole feedpoint *IS* nothing more than a large
choking impedance which discourages common-mode current
from flowing through the higher-the-better impedance.
I usually refer to the W2DU balun as a choke-balun.
--
73, Cecil http://www.w5dxp.com

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