Never thought of this

[Jacek Radzikowski]

The GPS module probably was used as a time reference, so it gad to be local.
Low speed signaling overlaid on the mains was (still is?) used to control
heavy residential loads, e g. water heaters.
And it's beyond my imagination why modern appliances can't hold settings
through a short power outage, or don't have a simple rtc.

Jacek
Kw4ep


On Fri, Nov 29, 2024, 16:21 Jason Wright <jason at thought.net> wrote:

> 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).
>
> 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).
>
> On Fri, Nov 29, 2024 at 11:10 AM Elton A Sanders <radiodog77 at pobox.com>
> wrote:
>
>> Time stamp by power hum.
>> https://www.youtube.com/watch?v=e0elNU0iOMY
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