[Elecraft] K3 Multi-Band antenna thoughts

[Vic K2VCO]

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