<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>Maybe this page <a href="https://fnetpublic.utk.edu/frequencymap.html">https://fnetpublic.utk.edu/frequencymap.html</a> but I can't get it to load. I remember a page with a heat map of frequency and phase and there could be a difference even in the same grid.<br></div><div> Sandy<br></div><div> WB5MMB<br></div><div><br></div><div>On Fri, Nov 29, 2024, at 3:21 PM, Jason Wright wrote:<br></div><blockquote type="cite" id="qt" style=""><div dir="ltr"><div class="qt-gmail_default" style="font-family:times new roman, serif;">One of my coworkers at INL did some research into using the precise frequency measures to locate the source of grid disturbances. Essentially, his research group built a relatively cheap device that you plug into the mains. iirc, the device had a GPS (or you just told it where it was physically, I don't recall). It measured the change in frequency and reported back to a central server. They could look at the changes in the frequency as grid events propagated through the system. (iirc, this work was done 2010 or so).<br></div><div class="qt-gmail_default" style="font-family:times new roman, serif;"><br></div><div class="qt-gmail_default" style="font-family:times new roman, serif;">I've personally wished the power companies would use a low speed signalling mechanism to put timestamps on the wire... mainly so I wouldn't have to set the clock on my microwave and oven (30 second resolution would suffice for this application).<br></div></div><div><br></div><div class="qt-gmail_quote qt-gmail_quote_container"><div dir="ltr" class="qt-gmail_attr">On Fri, Nov 29, 2024 at 11:10 AM Elton A Sanders <<a href="mailto:radiodog77@pobox.com">radiodog77@pobox.com</a>> wrote:<br></div><blockquote class="qt-gmail_quote" style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-color:rgb(204, 204, 204);border-left-style:solid;border-left-width:1px;padding-left:1ex;"><div>Time stamp by power hum.<br></div><div> <a href="https://www.youtube.com/watch?v=e0elNU0iOMY" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=e0elNU0iOMY</a> <br></div><div> _______________________________________________<br></div><div> Tacos mailing list<br></div><div> <a href="mailto:Tacos@amrad.org" target="_blank">Tacos@amrad.org</a><br></div><div> <a href="https://lists.amrad.org/mailman/listinfo/tacos" rel="noreferrer" target="_blank">https://lists.amrad.org/mailman/listinfo/tacos</a><br></div></blockquote></div></blockquote><div><br></div></body></html>