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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
