Darn autocorrect "balun"......not baling! Bob, K4TAX
Sent from my iPhone > On Jan 9, 2018, at 10:41 AM, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > Not only winding them wrong but if find more and more being used incorrectly. > There is no one baling design that can be used in all applications. The more > common error is the internal balun contained in tuners. > > Bob, K4TAX > > > Sent from my iPhone > >>> On Jan 9, 2018, at 3:33 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: >>> >>> On 1/8/2018 8:19 PM, K9MA wrote: >>> I would be cautious about using a transformer above 40 meters, as the stray >>> capacitance may be too large. I haven't tried it, though, so it might work >>> with some transformers. >> >> For years, we've been winding our transformers wrong. The windings should be >> on opposite sides of the core, so that capacitive coupling is minimized, NOT >> laying on top of one another. In a ferrite materialthat is SUITABLE for use >> as a transformer, the mu is high enough that a VERY high fraction of the >> flux in toroid is contained within the core, with very little leakage flux. >> Windings that lay on top of each other maximize capacitive coupling, and >> thus maximize common mode current. Windings on opposite sides of the core >> minimize common mode current. >> >> Ferrites are semiconductors, so they act as a dielectric. When we place >> windings on opposite sides of a core, we maximize magnetic coupling and >> minimize capacitive coupling, which is from one winding to the core and from >> the core to the other winding. That capacitance is VERY small if the >> windings are widely spaced. >> >> 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 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 arch...@mail-archive.com
