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

[Graham]

Dave,

That's cool. I am the dot just above the US / Canada border and just 
below the Ontario/Quebec border in Eastern Ontario.

There are many (many) documents that can found using Google on the 
subject of power grids and frequency and monitoring. I have only been 
able to read through only a small handful. An interesting application of 
time and frequency measurement.

cheers, Graham ve3gtc



On 2015-02-28 19:50, DaveH wrote:
> Like this?
>
> http://fnetpublic.utk.edu/gradientmap.html
>
> I am the dot just below the Canadian border in WA State.
>
> Dave
>
>> -----Original Message-----
>> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf
>> Of Philip Gladstone
>> Sent: Friday, February 27, 2015 07:47
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Recording mains frequency/phase
>> [WAS: No GPSsatellites]
>>
>> On 2/26/15 20:39, Charles Steinmetz wrote:
>>> ben wrote:
>>>
>>>> I'm going to have to build one of these. Assume you have
>> some sort of
>>>> circuit that converts low-voltage AC from a transformer
>> secondary to
>>>> a pulse train, start a timer, and count x amount of pulses?
>>> Here is a zero-cross detector designed for this purpose:
>>>
>>>
>> <http://www.ko4bb.com/manuals/download.php?file=02_GPS_Timing/
>> Simple_AC_Mains_Zero_Crossing_Detector.pdf>
>>>
>>> Most mains-nuts feed the ZCD pulse to the DCD line of a PC's RS232
>>> port and use the computer to time-stamp the crossings and
>> append them
>>> to a file of such time stamps.
>> 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?
>>
>> Philip
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