If it were me I do not think I would furnish or propose any home made device as a solution. Were there to be a failure in the treadmill shorty thereafter you can be sure where the blame would be placed. A really worse case scenario would be a fire. Then it would be a let the law suits begin situation.
I would look around for some type of commercial line filter that could be placed in the line. To keep the money in the Ham marketplace here is a possible if the treadmill is under a 7 amp load: http://www.arraysolutions.com/Products/nqnaclinefilter.htm I have no experience with this unit, or financial interest in it either. But if the interference was real aggravating to me I'd invest in a potential solution and propose something along these lines as a "loaner". 73, Bob K2TK Don Ehrlich wrote: > Bill, > > My own treadmill causes severe interference here in the house. I'm the only > one who uses it so it does not affect my own radio but it blanks out any AM > radio in the house that happens to be turned on. I reduced the noise to an > insignificant level by simply plugging a few microfarads of film capacitor > into the same power outlet that the treadmill is plugged in to. I just > wired up the capacitors to an AC plug in a neat little package that looks > like a big wall wart. The interference definitely is carried throughout the > house by the wiring. I suspect that if your neighbor would agree to plug a > similar module into the same outlet as is his treadmill that it would > improve your noise situation. > > Don K7FJ > > > > >> Thank you Elecraft reflector members for all of the great suggestions on >> this QRN problem.. With your help I was able to locate the problem. I >> would of not found it without your help. >> >> Now, I have no idea what to do about the issue, perhaps nothing. I now >> know the source. >> >> It's my neighbors treadmill. We share a power transformer (underground >> utilities). Although I bet the noise is from a motor arching and most >> likely is radiating at the motor as opposed to being carried on the power >> line. I have hope as he is not a ultra marathon runner and his runs >> rarely cause a QRT of over an hour. >> >> If you want to hear the sound click on the Flickr link: >> http://www.flickr.com/photos/ak5x/4279625626/in/photostream/ >> http://www.flickr.com/photos/ak5x/4279577818/in/photostream/ >> >> Thank you again list members for allowing me to tap the collective :) >> 73, >> Bill >> AK5X >> >> >> On Jan 16, 2010, at 1:34 PM, 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 >>> >>> >>> >>> >>> >> 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
