Oops, thanks for the clarification. I should have added “at the antenna”. After reading K9YC’s encyclopedic work (http://audiosystemsgroup.com/RFI-Ham.pdf <http://audiosystemsgroup.com/RFI-Ham.pdf>) four times, it has seeped into the lower neurons.
Maybe I should read it again. wunder K6WRU CM87wj http://observer.wunderwood.org/ (my blog) > On Sep 28, 2015, at 6:33 PM, Bob McGraw - K4TAX <[email protected]> wrote: > > I would agree that a 1:1 balun is preferable in as much as a center fed > dipole appears to have a balanced feed point while a coax feed line is > unbalanced. In addition, a common mode choke at the feed point is suggested. > For 100 ft of RG-8x at 14 MHz the loss is ~ 1.25 dB when matched. Other > than using a balanced feed system, which will much more complex to install, > RG-8x is about the best way to go. You may also find that a 2nd common mode > choke at the radio will also be helpful as well. > > The Balun Designs products work very well in this regard. For Common Mode > Chokes, in several applications I use a product from The Wireman being model > #8232. This is a 3' coax jumper with beads and is good for 160M - 10M at > near legal limit power. > > 73 > Bob, K4TAX > K3S s/n 10,163 > > On 9/28/2015 7:40 PM, Walter Underwood wrote: >> A 1:1 current balun could be very useful at rejecting nearby common-mode >> interference. At my house, that dropped the noise floor by about 6dB. > > > ______________________________________________________________ > 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]
