Here is a web site that might be of help to you in identifying this. It is the RF noise identification web site.
http://www.arrl.org/tis/info/HTML/rfi-noise/appliances.html To me it sounds a lot like the "treadmill" noise clip. Hope this is of help. 73, John KD8K Bill Hammond wrote: > I have been chasing this noise in my urban neighborhood for several years > now. It usually visits during the daylight hours and stays for several > hours. It has a rhythm and is across all frequencies and bands. I have > pulled the big switch in my house and the noise is still with me (listening > on battery powered rigs). Neighbors on all sides of my city sized lot have > swimming pools and my first suspicion is noise generated by circulation > pumps. > > Here are two recordings (on a K3 of coarse). Why not ask the most > discriminating radio fans in the world their opinions on the source? > > http://www.flickr.com/photos/ak5x/4279625626/in/photostream/ > > > http://www.flickr.com/photos/ak5x/4279577818/in/photostream/ > > > Bill Hammond-AK5X > [email protected] > [email protected] > [email protected] > K3 #69 > K2/100 #4637 > K1 #2033 > KX1 #1023 > T1 > > > > ______________________________________________________________ > 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 > > > ______________________________________________________________ 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
