Konrad: Most likely a wall wart that uses a switching supply inside it. Unplug all the wall warts in your shack, one at a time. Mine was the one running my WiFi base/router.
--- Graham == On Sat, Dec 1, 2012 at 4:15 PM, Steve Fowler <killmo...@gmail.com> wrote: > Welcome to urban noise pollution! At least that's my best guess. I have > switch mode power supplies in my house along with the PWM motor controller > on my furnace that make noise like that. The one I had that acted exactly > like yours was a SMPS powering my security cameras. The frequency changes > with minor variations in the load, which causes the drifting you see, and > the long wires feeding my cameras make great transmitting antennas. You > can track down and reduce or eliminate the noise coming from your own > house, but then you'll start picking it up from the neighborhood and > beyond. > > > On Sat, Dec 1, 2012 at 3:50 PM, konrad schultz <konra...@hotmail.com> > wrote: > > > > > > > > > > > Anyone having a similar problem. I see (on the panafall) and hear in the > > headphones a sweeping signal or noise that regularly and slowly goes > across > > the band in time. Right to left and then back. Adds 20 db of noise to a > > -119 db threshold on 20M CW. I am using my FLEX 3000 portable here at > our > > condo in SW FL. Ant is a portable dipole mounted on a camera tripod > using > > two MFG 20M whips and stands 3-6 feet off the ground. 50 Ohm coax. New > > Lenovo laptop. All seemed to work fine at our QTH up north on 80M > dipole - > > which is up in two trees. Thoughts? Best, Konrad W1KON > > _______________________________________________ > > FlexRadio Systems Mailing List > > FlexRadio@flex-radio.biz > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > > Knowledge Base: http://kc.flexradio.com/ Homepage: > > http://www.flexradio.com/ > > > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: > http://www.flexradio.com/ > _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
