[time-nuts] Recording mains frequency/phase [WAS: No GPS satellites]

[Daniel Mendes]

I´m planning an experiment like that... I designed a board with an OCXO, 
pic microcontroller, power supply, mains interface with optocoupler, and 
SD card for data collection.. I plan to sincronize a counter running at 
10MHz between them and log events at 5 different points in my city. The 
boards also have a small Li-Ion battery and battery charger for short 
power outages. Boards are manufatured and the most expensive items have 
been bought, but not everything yet.

Daniel

On 27/02/2015 21:41, Mark Sims wrote:
> Yes, it has been done...  and it has some very interesting real world uses:
> http://www.theregister.co.uk/2014/07/03/tinfoil_hatters_spook_says_nsa_can_track_whistleblowers_through_power_lines/
>
> -----------------
> If we all did this, then I realize that we could identify the different power grids. However, I wonder if there is any interesting variation *within* a grid. As the electricity flows vary throughout the day, it seems possible that the phase difference between two people on the same
> grid would actually change (a bit).
>
> Has anybody done this experiment? 		 	   		
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