Tom Van Baak wrote:
You know, if the stackable TAPR module
project catches on another PCB on the list
could be a mains frequency monitor.
It would robustly filter and divide the 50/60 Hz
mains frequency to 1 PPS and then onboard
compare that 1 PPS against the local (OCXO,
atomic, or GPS) 1 PPS
TVB said, "If there's a power
industry person in time-nuts we'd love to ask you
a few questions."
I'm not a power industry person, but I've researched the
problem over the years. Here are some of the results.
The generators are all synchronous machines. The ones in
one power plant rotate with ve
In message <[EMAIL PROTECTED]>, "Tom Van Baak" writes:
>You know, if the stackable TAPR module
>project catches on another PCB on the list
>could be a mains frequency monitor.
>
>It would robustly filter and divide the 50/60 Hz
>mains frequency to 1 PPS and then onboard
>compare that 1 PPS against
> Does your phase plot mean that a mains powered wall clock might be off
> by 10 seconds?
>
> Have Fun,
>
> Brooke Clarke, N6GCE
Yes. I also keep an old AC synchronous motor
wall clock around just to see this effect. To be
fair, it is unusual for it to be off this much, or
for very long.
> May
I have a digital clock that runs from the 60 hertz power. I have
noticed several times that TVA power can gain time up to 15 seconds
compared to UTC. Takes a few weeks.
I also did a stability test using a rubidium and dividers and I showed
about a +/- 0.03 hertz deviation over one hour, duri
Hi Tom:
Does your phase plot mean that a mains powered wall clock might be off
by 10 seconds?
Have Fun,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Tom Van Baak wrote:
. . .
For real plots of
> > Certainly. But what's your point? I don't see these utilities failing
> > if a second slips here or there. The one case where time is critical
> > is the power grid, and they keep their own time (Which, IIRC
> > approximates UTC).
The power companies used to use GOES heavily;
early this ye
