Posted by
alorona on
Aug 08, 2010; 6:02am
URL: http://elecraft.85.s1.nabble.com/Re-Backward-balun-tp5383661p5385441.html
Thanks for all of the excellent advice.
To sum up, today I measured a 4:1 current balun backwards and Tom was pretty
right on... the high frequency cutoff is so severely lowered that it is unusable
for my application. I did not test a 4:1 voltage balun.
I think one approach to take is to use a unun to transform down to 12 ohms and
then a conventional 1:1 balun following that to transform to a balanced feed.
I'll try this and report back if it doesn't work.
I know that there were several who suggested Sevick's book-- and I hope I'm not
commiting sacrilege by saying that I've gotten very little understanding of
balun theory from that book. It's a great cookbook for constructing baluns (and
ununs), but not so great to learn why one is doing what he's doing. But that's
just me.
It is also very surprising that I found almost no reference to a 50-to-12.5 ohm
balun on the web. You can certainly find one for purchase, but you can't find
the instructions on how to wind one. You have to buy the book, I guess!
This is surprising to me because I can think of many applications where one
needs to transform 50 ohms to a lower (balanced) impedance, including the one I
am currently battling.
Thanks again to everybody.
Good weekend,
Al W6LX
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