How much jitter is there in the 8am number? If industrial, I could easily see the first shift coming in and all starting up at about the same time and shutting things off one by one as the jobs finish. But I would also expect it to not show up on weekends and/or holidays, etc. Same applies for the theoretical UPS truck w GPS jammer. And there could be several minutes of jitter.
If it's very precise, that would be more along the lines of a software error. More data! :) On Fri, Sep 29, 2017 at 9:13 AM, Rob Kimberley <[email protected]> wrote: > I'd go with a power surge as it's so regular at 8AM. > Rob > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of Skip > Withrow > Sent: 28 September 2017 21:18 > To: time-nuts > Subject: [time-nuts] Weird GPSDO behavior > > Hello Time-Nuts, > > I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt) > with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place. I > have been running Lady Heather 5.0 and have changed the damping, gain, and > time constant to give me a 20,000 second time constant with a damping of > .6. I have attached a Lady Heather screen shot of the weird behavior. You > can see that my GPS antenna is in a very none ideal location (window on the > west side of the building). > > Once per day (about 8am) something disturbs the system. So, the GPSDO > spends much of its time recovering and never gives me anywhere near the > performance that this system is capable of. I would think that it is not > the PRS-10 as it has no knowledge of time. I would also think that it is > not the GPS system or receiver, since the GPS constellation repeats twice > per day. > > Kind of the two things that I am left with are a glitch by the power > company every morning (there is some large industrial machinery across the > street (but then I would kind of expect glitches at 8am and 5pm), and > perhaps Lady Heather doing something funny. This system has been running > for quite some time, I have not tried restarting Lady Heather yet. > > Anybody seen anything like this, or have any good ideas? > > Thanks in advance, > Skip Withrow<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br /> <table > style="border-top: 1px solid #D3D4DE;"> > <tr> > <td style="width: 55px; padding-top: 13px;"><a href=" > https://www.avast.com/sig-email?utm_medium=email&; > utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" > target="_blank"><img > src="https://ipmcdn.avast.com/images/icons/icon-envelope- > tick-round-orange-animated-no-repeat-v1.gif" > alt="" width="46" height="29" style="width: 46px; height: 29px;" > /></a></td> > <td style="width: 470px; padding-top: 12px; color: #41424e; > font-size: 13px; font-family: Arial, Helvetica, sans-serif; > line-height: 18px;">Virus-free. <a > href="https://www.avast.com/sig-email?utm_medium=email&; > utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link" > target="_blank" style="color: #4453ea;">www.avast.com</a> > </td> > </tr> > </table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" > height="1"></a></div> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
