Hi Bob,
They're spikes. So, what I'll do is just keep a test like this running for the
next few days as I do other things. I'll go ahead and put it back on internal
clock, just in case. If I see nothing, I'm going to have to conclude it's the
power line. If bad weather comes back and they happen again, once again I have
to conclude it's the power line.
I haven't taken the time to go through either unit. I'll try to make some time
for that in the next few weeks.
Bob
-----------------------------------------------------------------------------------
GFS GPSDO list:
groups.yahoo.com/neo/groups/GFS-GPSDOs/info
From: Bob Camp <[email protected]>
To: Bob Stewart <[email protected]>; Discussion of precise time and frequency
measurement <[email protected]>
Sent: Thursday, July 7, 2016 10:17 PM
Subject: Re: [time-nuts] The home time-lab
Hi
Have you been through the full alignment process on one or both of the 5370’s ?
They are as much
an analog beast as they are digital. They *do* drift out of calibration /
alignment / adjustment. When
they go it’s usually not all of a sudden. They just gradually get worse and
worse as the adjustments bake
away inside that hot box.
===========
35 ns pops are pretty big. Are you seeing spikes or are you seeing steps?
Spikes can be just about
anything, including the next door neighbor’s bug zapper. Steps are a bit more
indicative of something
actually wrong. In either case, a counter with far less resolution than a 5370
can be used to help “triangulate”
the problem. A free running OCXO (or three) is also perfect for this sort of
thing.
Bob
> On Jul 7, 2016, at 10:16 PM, Bob Stewart <[email protected]> wrote:
>
> Tim,
> There is one variable that I neglected to mention in the first response.
> I've been unhappy with the stability of the 10811s in both 5370s. So, for
> this test, I'm using the 10MHz output from another one of my units to supply
> the clock. In the past 71,000 seconds of the retest, I'm seeing a phase
> variance of only +60ps to -80ps in timelab with an "averaging window" of 0.
>
> Bob
>
>-----------------------------------------------------------------------------------
> GFS GPSDO list:
> groups.yahoo.com/neo/groups/GFS-GPSDOs/info
>
> From: Tim Shoppa <[email protected]>
> To: Bob Stewart <[email protected]>; Discussion of precise time and frequency
> measurement <[email protected]>
> Sent: Thursday, July 7, 2016 8:16 PM
> Subject: Re: [time-nuts] The home time-lab
>
> 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
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