On Sun, 2016-08-07 at 15:50 +1000, Gary wrote: > Hi, > I have an inverter generator producing S9 noise on 3.5Mhz, and S7 > noise on 7Mhz. Higher frequencies are clear. > If I were to use a trifilar wound choke on the lead from the > generator, what would be the best mix...43, 77 or?.... > I can source ferrite cores here in VK, whether I can obtain what I > will need is unknown but likely. Failing that, Mouser? > I spent a lot of time searching the web but unsure still. > If the learned group could help out with advice it will be greatly > appreciated. > Hello Gary,
I have had good luck using mix31 material in the FT-240-31 configuration. See: http://www.fair-rite.com/design-tools/materials/ For an explanation of what each mix does, also see: http://audiosystemsgroup.com/RFI-Ham.pdf and: http://audiosystemsgroup.com/SAC0305Ferrites.pdf and: http://www.karinya.net/g3txq/chokes/ for more information. -- 73's, and thanks, Dave (NK7Z) For software/hardware reviews see: http://www.nk7z.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
