W8JI wrote: > > > Sam, > > It is common for me to hear hum or buzz on local receivers > very near a transmitter. Even on perfectly clean > transmitters unless I use a line tap to sample signal all > sorts of stuff mixes in. I've never really looked into why. > My guess would be it is some nasty multipath being modulated > by something. Just a guess. > > I'm not saying you don't have hum, but just cautioning you > to be careful when listening on a local receiver near a > transmitter. I can replicate hum on my shop receivers even > with a very clean transmitter on the bench. > > That aside, did you try disconnecting everything except the > K3 antenna and power supply? > > Switching supplies do not normally cause 60 or 120 Hz > problems. > > 73 Tom > > >
I agree with Tom. I have wasted a lot of time trying to eliminate a non existent problem caused by local monitoring. Obviously as you have had reports from other stations there must be something wrong but I don't think the K3 is particularly prone to transformer induced modulation. Mine sits right next to a Diamond GSV3000 power supply which has a huge great transformer in it and I have never had a problem. ----- Julian, G4ILO. K2 #392 K3 #222. * G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html -- View this message in context: http://elecraft.365791.n2.nabble.com/AC-hum-on-tune-tp5061903p5062847.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
