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

Tom Van Baak tvb at LeapSecond.com
Sat Feb 28 21:09:32 UTC 2015


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.).

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

/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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