I think we are drifting off topic, my apologies, but if you are considering an ocf dipole you can only prevent common mode currents by use of a double wound balun, ie 2 separately made chokes connected together as a 4:1. A single core version does not properly cancel the common mode current that results in unwanted radiation from your coax feeder and can make your equipment live to rf. A huge amount of work has been done on this subject by DJ0IP and I suggest you look at his site
http://www.dj0ip.de/balun-stuff/ is a good place to start. The proof of the pudding is in the eating and I have not seen anyone do real world measurements like he has on real aerials. David G3UNA > > On 30 September 2015 at 20:51 Jerry Moore <[email protected]> wrote: > > > What I don't understand is my previous radio didn't affect the TV as far > as I know (xyl never complained) so it has me perplexed because the radio > shouldn't matter. As far as the buckmaster ocf, it uses a current transformer > (auto-transformer )to balance the antenna and match the impedance. > Jer > > On September 28, 2015 1:37:16 PM EDT, Jim Brown > <[email protected]> wrote: > >On Mon,9/28/2015 9:35 AM, dw wrote: > >> If a tuner is located at the rig-side of the coax, and the coax is at > >> high SWR, it could possibly be a cause for coax radiation. > > > >It doesn't work that way. > > > >Radiation from coax is the result of IMBALANCE in the antenna. A > >ferrite > >common mode choke at the feedpoint can fix that. > > > >73, Jim K9YC > >______________________________________________________________ > >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 > >Message delivered to [email protected] > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > ______________________________________________________________ > 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 > Message delivered to [email protected] > ______________________________________________________________ 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 Message delivered to [email protected]
