[Elecraft] OT Local QRN what is it?

[Bill Hammond]

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
wham727 at aol.com
ak5x at mac.com
ak5x at sbcglobal.net
K3 #69
K2/100 #4637
K1 #2033
KX1 #1023
T1