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 <kb...@n1k.org> To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency measurement <time-nuts@febo.com> 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 <b...@evoria.net> 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 <tsho...@gmail.com> > To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency > measurement <time-nuts@febo.com> > 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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.