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Hi Stefan and all,
you wrote:
Yes, a good idea. I will try to catch it :-) But how do i know
that it
is the US mains instead of a 60 Hz monitor? Is the 60 Hz from the
mains
more stable?
I guess the opposite: Similar to our Eu mains frequency, the US 60
Hz signal "wanders around" very slowly, as the load changes, but in
the long run they also keep the frequency stable, nation-wide. Not
sure about the maximum excursion from the nominal frequency (I lost
the notes and screenshots years ago when a harddisk died) and how
many mHz per minute the frequency may drift. But you can see the
weak 60 Hz trace in Renato Romero's ZEVS spectrogram at
http://www.vlf.it/zevs/zevs.htm
73,
Wolf .
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