[Elecraft] K2, KAT2 and displaced choke balun feed

[N2EY at aol.com]

In a message dated 9/6/07 6:07:54 PM Eastern Daylight Time, 
w3fpr at embarqmail.com writes:


> With a good balun at the output of a good unbalanced autotuner, the 
> balance *should* be perfect.  The task of finding out why it may not be 
> perfect in any one installation may indeed be more difficult than giving 
> up and simply using a modern balanced tuner even with  the drawbacks of 
> any of the currently available balanced tuners.
> 

One big reason for unbalance is the wide variety of impedances that the 
balanced load may present. What balun can do its job with resistive part varying 
from a few ohms to several thousand, and reactive part from a few thousand 
capacitive to a few thousand inductive? And do the job over a 10:1 HF frequency 
range? 

This is why the unbalanced tuner/balun combo works so well for some and so 
poorly for others - or even both, depending on band. If the impedance and 
frequency to be matched are such that the balun can do its job, great! But that's 
not always the case.

73 de Jim, N2EY 


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