[time-nuts] 60 Hz measurement party
jimlux at earthlink.net
Sun Jun 26 16:57:01 UTC 2011
On 6/26/11 8:34 AM, Alberto di Bene wrote:
> A simple way to measure the line frequency (up to a given precision...)
> is to watch on a waterfall program to one of its harmonics.
> In the following picture you can see the 53rd harmonic of the 50 Hz line
> frequency in Italy. It was captured by just connecting a random length
> of wire to the line input of a sound card, thus capturing the ambient hum.
clever idea, but I think that frequency is less interesting than phase
(or more interesting, phase differences between different places)
But phase of a harmonic is tied to phase of the fundamental, so with the
right reference (a trusty 1pps?) it could work.
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