Make sure there is a ground wire on the rotator controller. That knocked the hum way down here. I had the same problem with my TS-850's, and there were no audio input transformers in that rig.
Dave Hachadorian, K6LL Yuma, AZ ----- Original Message ----- From: "Igor Sokolov" <ua9...@gmail.com> Cc: "Elecraft" <Elecraft@mailman.qth.net> Sent: Wednesday, October 21, 2009 4:35 PM Subject: [Elecraft] k3 50Hz background noise > My friend, K3 user is getting ready for CQWW SSB. In his > installation the > rotator control box that has pretty large transformer > inside. The box is > only few inches away from one of the two K3s and cannot > be moved. He has > discovered that magnetic field created by this transformer > interacts with > the AF transformer (Line in) in K3. The indused 50Hz noise > is only 20db down > from the audio signal. The noise is gone when line in is > switched off in the > menu but that leaves him without voice keyer which is > tough to be deprived > of in 48 hours SSB contest. Has anybody found a solution > yet. He now thinks > of taking the transformers out of the radio an bypassing > them. He thinks > that the problem roots to the fact that the K3 cabinet is > made of aluminum. > > 73, Igor UA9CDC > > ______________________________________________________________ > 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 ______________________________________________________________ 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
