[time-nuts] The home time-lab

Tim Shoppa tshoppa at gmail.com
Thu Jul 7 21:16:49 EDT 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:

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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