Where can I find the results comparing these 4 antennas? http://www.dj0ip.de/cmc-test/the-antennas/ Thanks and 73, Dick, K2ZR -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of David Cutter Sent: Saturday, July 05, 2014 1:30 PM To: elecraft@mailman.qth.net; j...@audiosystemsgroup.com Subject: Re: [Elecraft] A Good Antenna Length?
Rick DJ0IP has performed many hundreds of cmc measurements over the last year or so. He has yet to publish his complete findings but here is a taste: http://www.dj0ip.de/cmc-test/ http://www.dj0ip.de/cmc-test/the-components/the-baluns/ http://www.dj0ip.de/cmc-test/pre-test-preparation/ http://www.dj0ip.de/cmc-test/results-test-data/ant-1-b0/ http://www.dj0ip.de/cmc-test/test-configurations/ http://www.dj0ip.de/cmc-test/results-test-data/ant-2-b5/ After many hundreds of measurements he has demonstrated that with a *dual core* Guanella 4:1 balun at the feed point, common mode current can be tamed even with deliberately poor antenna and feeder layout. There are not many folks who would take the care and have the patience to do this sort of work. David G3UNA ----- Original Message ----- From: "Jim Brown" <j...@audiosystemsgroup.com> To: <elecraft@mailman.qth.net> Sent: Saturday, July 05, 2014 3:24 PM Subject: Re: [Elecraft] A Good Antenna Length? > On 7/5/2014 2:05 AM, David Cutter wrote: >> You might consider an off-centre-fed dipole with appropriate balun and >> choke. > > Not if you're going to run power. An off center fed antenna generates high > common mode voltage, which will fry even the best choke when running > power. I wouldn't consider such an antenna at greater than 100W. > > 73, Jim K9YC ______________________________________________________________ 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 k...@arrl.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 arch...@mail-archive.com
