[Elecraft] Backward balun

[Al Lorona]

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