Robert Tellefsen wrote:
After listening to K9YC at our NCCC meetings, I
think I need to increase the impedance of this 1:1
choke balun though. It's a bit undersized from his
point of view :-)
Mine is huge, consisting of 13 turns of RG-58/u passing through SIX
FT-240-61 cores. A high common-mode impedance is also important for
efficiency.
We should add that a 1:1 balun is usually indicated for this
application, not a 4:1. Although the ladder line may have a
characteristic impedance of 450 ohms, the actual impedance looking into
the line varies widely with the band, the line length, etc.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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