DJ0IP must be one of, if not the post prolific testers of baluns and chokes *attached to aerials* ever. He does not measure them in the lab. His measurements are practical and done with rigour using modest equipment. He has done thousands of measurements for common mode current, only a fraction of which are on his website. Some of his results are not complimentary to commercial balun manufacturers. Caveat emptor. I'm glad his work is beginning to be recognised.
David, G3UNA > > On 04 February 2016 at 23:10 Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > > As one that has personally used a balanced fed antennas for years, I > suggest you review the info on this site. > http://www.dj0ip.de/balun-stuff/ <http://www.dj0ip.de/balun-stuff/> > > Good stuff on evaluating or building a proper balun. > > And for open wire fed antennas: > http://www.dj0ip.de/open-wire-fed-ant/ > > To answer your question, a high power 1:1 current balun is likely best. > Of course you could built a balanced tuner as I did. Problem solved. > That's another story. > > Keep in mind that balun power ratings are for "matched" conditions. > Which in fact is never the case with a center fed wire and open wire or > a balanced feed line. At a mighty 5 watts it would not be of concern. > > If at all possible, run the balanced feed line from the antenna feed > point all the way to the operating position. Keep the coax run between > the tuner output and balun input as short as practical. After all, the > reason to use balanced feed line is to take advantage of the low loss > properties. > > Never fear, the use of balanced feed line is not near as critical or > fussy as the "masses" will so tout. Many hams express fear in using > balanced feed systems, largely because of what they have heard. Mostly > because it frankly isn't fact. Mine feeds a 256 ft center fed wire and > comes down the tower supported on home made 9" PVC stand-offs, through > the attic eve vent, across the roof rafters, and drops down through the > ceiling to the tuner on the shelf above the desk. Not bad for a 160M - > 10M antenna. {see my pix on QRZ.COM that shows a bit of the line > going up the wall.} > > 73 > Bob, K4TAX > > <http://www.dj0ip.de/open-wire-fed-ant/> > > On 2/4/2016 2:55 PM, Jim Allen wrote: > > K2/100 and KAT100 here. > > > > I am changing around my modest antenna configuration now. I have been > > using the K2/100 with my AH-4, and now wish to use the KAT100 with > > balanced feedline antennas. > > > > What balun, homebrew or commercial, if any, should I use? I almost > > always run 5 watts, all CW. > > > > 73 de W6OGC Jim Allen > > > > Sent from my iPad > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:Elecraft@mailman.qth.net > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to rmcg...@blomand.net > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to d.cut...@ntlworld.com > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
