When he added the amplifier, the return currents on the coax became much greater. The second problem is that the switch then added the return currents of the vertical to those induced into the dipole and made things worse. I see the need for chokes on BOTH antennas. Makes sure they are heavy duty. The best advice is in the choke handbook at K9YC’s web site.
73! Jack, W6FB > On Apr 5, 2020, at 3:17 PM, Bob McGraw K4TAX <[email protected]> wrote: > > If it worked correctly before then why would one need to add a choke? > > Check connections, feed line, matching unit, and radial ground system at the > antenna. > > Bob, K4TAX > > > Sent from my iPhone > >> On Apr 5, 2020, at 4:52 PM, Buck <[email protected]> wrote: >> >> I would bet your coax shield is acting like a radial and bringing RF back >> into the shack. Need a choke. >> >> >> k4ia, Buck >> K3s# 11497 >> Honor Roll 8B DXCC >> EasyWayHamBooks.com >> >>> On 4/5/2020 5:33 PM, Carl Yaffey wrote: >>> No hum using a dummy load. >>> No hum using a dipole. >>> Hum only with my all band vertical. >>> Thanks for the suggestions. >>> 73 >>> K8NU >>> ______________________________________________________________ >>> 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] > > > ______________________________________________________________ > 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]
