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1. [RFI] treadmill noise (score: 1): Author: "David Robbins" <k1ttt@arrl.net>; Date: Fri, 26 Feb 2016 18:35:26 +0000; When turning on for the 160m contest I had strong stable noise spikes every 15khz across 160m. Checked everything in the house then went for a walk with my grundig g5. It was much stronger at the pow; /archives//html/RFI/2016-02/msg00129.html (7,902 bytes)
2. Re: [RFI] treadmill noise (score: 1): Author: Doug Powell <dougp01@gmail.com>; Date: Fri, 26 Feb 2016 11:45:38 -0700; David This is a very low frequency for an EMI filter, most of those are useful down to the low 100s of kHz. You may have to look into some sort of a low pass line filter, or look into making one of; /archives//html/RFI/2016-02/msg00130.html (8,744 bytes)
3. Re: [RFI] treadmill noise (score: 1): Author: Doug Powell <dougp01@gmail.com>; Date: Fri, 26 Feb 2016 11:48:52 -0700; I should mention that these treadmills came up on another forum as the culprit for nuisance tripping of GFI circuit breakers with arc fault detection. The treadmill is generally an unregulated device; /archives//html/RFI/2016-02/msg00131.html (8,906 bytes)
4. Re: [RFI] treadmill noise (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 26 Feb 2016 13:25:39 -0800; Start with a common mode choke on the power line, following winding guidelines for coax of comparable size. If that doesn't do it, look at conventional AC line filters from Corcom, Delta, etc. But tr; /archives//html/RFI/2016-02/msg00132.html (7,262 bytes)
5. Re: [RFI] treadmill noise (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 26 Feb 2016 16:15:17 -0800; Thanks, Lionel. The key to making a filter like the Delta or Corcom is to mount it so that the chassis of the filter bonds to the chassis of the noise source. It sounds like that's what you did. Ques; /archives//html/RFI/2016-02/msg00133.html (7,781 bytes)
6. Re: [RFI] treadmill noise (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 26 Feb 2016 20:05:46 -0800; Yep, I mounted the Delta inside of the enclosure with the electronics and the motor. The PWM controller I think is the source of the noise. I had 30 over noise in 5 -10 kHz wide every 15 to 30 kHz (; /archives//html/RFI/2016-02/msg00134.html (9,797 bytes)
7. Re: [RFI] treadmill noise (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Sat, 27 Feb 2016 20:46:33 -0500; Hi David, I have addressed treadmill interference before on here and I also created a simple website that documents the problem I had and the solution. I'm in China right now and have limited web acc; /archives//html/RFI/2016-02/msg00135.html (9,376 bytes)

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