Here's noise from my neighbors new washing machine (Samsung). http://www.slickpic.com/users/GeneGabry/albums/N9TFHamStationPhotos/?wallpaper&viewer#11792105 Repeats about every 17Khz. From about 20Mhz-22.5Mhz. Most of all the RF pollution in my neighborhood generates garbage on 15m. Have not seen any yet of 17m. At least the washing machine garbage only lasts for about 60 minutes two to three times a week (when I'm in the shack on 15m). Just wait until buck/boost DC-DC converters and switchers are deployed more prolific at 1Mhz and higher. Company I work for makes the line choke and power inductors used in those switchers. They are worse noise generators than the lower frequency switchers 50khz-500khz. It's only going to get worse :( Gene, N9TF
From: "HankP" <pfizenma...@q.com> To: "Robert G Strickland" <rc...@verizon.net> Cc: "Elecraft" <elecraft@mailman.qth.net> Sent: Friday, March 11, 2016 12:46:56 PM Subject: Re: [Elecraft] OT noise on 17m The stuff I have run into that is in the 16 to 18 khz range includes furnace /air conditioner motor controls and washing machines. Of course those are intermittent which is also a clue- although there are some furnace/A/C blowers that stay on at low speed all the time for circulation. If you have a P3 - decrease the span and most of the newer stuff at certain parts of the cycle will actually be several spikes in each group of noise. Hank K7HP ----- Original Message ----- Can someone help me understand the "noise" on 17m - and elsewhere - right now? It repeats every 17kc, very strong. Perhaps some sort of over the horizon radar? Is it general or just something in my neighborhood? Thanks much. ...robert -- Robert G Strickland, PhD ABPH - KE2WY rc...@verizon.net.usa Syracuse, New York, USA ______________________________________________________________ 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 Message delivered to pfizenma...@q.com ______________________________________________________________ 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 Message delivered to n...@comcast.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
