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
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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