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

Daniel Mendes dmendesf at gmail.com
Sun Mar 1 11:00:32 EST 2015

On 28/02/2015 18:09, Tom Van Baak wrote:
> Hi Daniel,
> That will be an interesting experiment. I'm happy you are doing it. You may want to run all five boards within the same house first -- to establish your noise floor and to check your post-processing (non-aligned log files, glitches, power fails, oscillator drift, etc.).

Surelly... I must first discover how well (or how badly) it works....

> Here's one from a couple years ago, between two cities, and two states.
> http://leapsecond.com/pages/mains-cv/

Thanks for the link!


> /tvb
> ----- Original Message -----
> From: "Daniel Mendes" <dmendesf at gmail.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Saturday, February 28, 2015 10:34 AM
> Subject: Re: [time-nuts] Recording mains frequency/phase [WAS: No GPSsatellites]
> 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
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