On Wed, Sep 8, 2010 at 10:27 AM, Jim Barber <audio...@charter.net> wrote:
> Variable-frequency motor drives can look like that too. Any industrial > laundries, food processors etc. in the neighborhood? > > Of course the neighbor's front-loading washing machine could just as easily > have a noisy VFD, (my Sears Kenmore Elite does, unfortunately) but the > regular hours of operation would indicate something else. > My wife's treadmill in our home gym looks the same way and the noise "hill" moves back and forth with her running. Since her gym is above my shack, I can hear her feet, hear the tredmill motor, and watch the noise peaks move back and forth in beautiful synchronicity. And then there is the charge controller for the PV/battery system. That one makes sharp spectral lines as does the power supply in the ethernet switch. We live in a noisy world. -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 br...@lloyd.com +1.767.617.1365 (Dominica) +1.931.492.6776 (USA) (+1.931.4.WB6RQN) _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
