[time-nuts] The home time-lab
Tim Shoppa
tshoppa at gmail.com
Fri Jul 8 01:16:49 UTC 2016
1/35ns is about 30MHz. Is there anything in your clock chains that is
ticking at 30MHz, such that a false count or slipped count induced by
inductive disruption, would cause a 35ns phase jump?
Related thread:
https://www.febo.com/pipermail/time-nuts/2016-May/098028.html
Tim N3QE
On Thu, Jul 7, 2016 at 8:44 PM, Bob Stewart <bob at evoria.net> wrote:
> I hope this isn't too far off topic, as this is having a big impact on my
> testing.
>
> I decided to run an A/B test on one of my GPSDOs: comparing the phase of
> the two 10MHz output channels. In the middle of the night, there was a
> long series of 35ns pops in the phase data. Strangely enough, there was
> nothing in the data collected directly from the unit involved. The
> preceding two days we had had a number of switching transients where the
> lights blinked but nothing shut down. So, putting one and one together, I
> suspect that a fair percentage of the strange results I've been getting has
> been power-grid related.
> So, what to do? I've been looking at UPS devices, and I don't even
> understand enough to waste my money on a bad one. The two big questions
> seem to be "on-line" and "sine wave". Make that three: can I trust the
> mfgs claims? Is there something affordable that could run a pair of 5370s
> and maybe another 50W worth of DUTs for up to an hour or two and not be
> prey to power-line transients? Or would it be more cost effective to
> somehow monitor the power line for spikes or phase jumps and blow off tests
> or cut out the offending data? From time to time we get a thread on
> power-line nuts. Should I have been paying more attention?
>
> Bob - AE6RV
>
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