Bob, You are so right about that. I might further state that anything which plugs into the AC outlet must have UL or other testing lab approval stickers on it, so giving a neighbor an unapproved homebrew device opens to door for liability.
73, Don W3FPR Bob wrote: > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.730 / Virus Database: 271.1.1/2634 - Release Date: 01/20/10 > 04:12:00 > > ______________________________________________________________ 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
