It is also characteristic of the RFI produced by "touch control" devices, as used for lamps and such. Have you powered down various circuits in your home to see if one of them is the culprit? I have had touch-control RFI from as far away as several houses distance. Another source of this type noise is proportional-control aquarium tank heaters, also battery chargers. Drifting frequency is often a give-away of interference from a touch-control device.
Can you hear it on a battery powered portable AM radio? If so, try walking around your house and around your neighborhood. The loop antenna inside the radio will give good directional indication when pointed at or 180 degrees away from the noise source. Test on an AM radio station of known direction (preferably from the next town) to get an idea of how to interpret loop patterns. Let us know what you discover - Jim, KL7CC riese-k3...@juno.com wrote: > I see the same thing on 75 and it tends to drift and appears every 10 Kh > or so > )(#$*%_)(#&*% switching powersupplys > > sounds like power line noise > > Bob K3DJC > On Wed, 09 Nov 2011 16:29:16 -0800 Vic K2VCO <k2vco....@gmail.com> > writes: > >> Has anyone ever seen anything like this? It seems to be there 24-7. >> >> <http://www.qsl.net/k2vco/160noise.jpg> >> >> Another view with a wider span: >> >> <http://www.qsl.net/k2vco/160noise1.jpg> >> >> -- >> 73, >> Vic, K2VCO >> Fresno CA >> http://www.qsl.net/k2vco >> ______________________________________________________________ >> 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 >> >> >> > > ____________________________________________________________ > Get Free Email with Video Mail & Video Chat! > http://www.juno.com/freeemail?refcd=JUTAGOUT1FREM0210 > ______________________________________________________________ > 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
