[Elecraft] balanced tuner

[David Woolley]

Tom W8JI wrote:
> 
> 
> Why would anyone ever put a 4:1 voltage balun on a tuner input? Bad 
> enough to use one on the output!

Who said voltage balun?  The Elecraft 4:1 baluns are current baluns.

One wouldn't put them directly on the input, but the point was that it 
is not sufficient to say that a current balun never has an impact on 
differential signals.  The real implication here is that 4:1 current 
baluns have rather a narrow range of applicability.

Actually one might put them on the input, in the sense that one might 
have a balanced feeder at close to 200 ohms and a balanced tuner at the 
antenna end.  That's probably the only case in which they would work 
well.  (Given that good balanced feeders are rather more than 200 ohms 
(although twisted pair is less), 4:1 is a compromise between easy 
engineering and optimum match.

-- 
David Woolley
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