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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