[time-nuts] Building a mains frequency monitor

Jeremy Nichols jn6wfo at gmail.com
Thu Apr 7 06:18:11 UTC 2016


My measurements show the fractional frequency deviation of the power line
at my home is ~25 e-6 with a 1-second measurement and 100 loops through the
calculation. I agree with Bill that a precision frequency source is not
necessary.

Jeremy
N6WFO


On Wednesday, April 6, 2016, Bill Hawkins <bill.iaxs at pobox.com> wrote:

> Phase noise? The line frequency shifts phase every time a major
> electrical load is added or dropped from the power line.
>
> Seems to me this effect swamps every error in the measurement system.
>
> You are looking for parts per thousand at most. Precision GPSDO 10 MHz
> is overkill.
>
> In my humble opinion, that is.
>
> Bill Hawkins
>
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com <javascript:;>] On
> Behalf Of Jay
> Grizzard
> Sent: Wednesday, April 06, 2016 8:22 PM
> To: time-nuts at febo.com <javascript:;>
> Subject: [time-nuts] Building a mains frequency monitor
>
> Since it seems to be a week for new projects on time-nuts... ;)
>
> So I've been wanting to set up a power line frequency monitor for a
> while, and now(ish) seemed to be a good time for me.
>
> -------- %< -------
>
> I appreciate any comments / feedback / pointers!
>
> -j
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