Active HM, yes - nothing in the logs that corresponds, except a .5 degC diurnal temperature change - which roughly coincides with the outdoor temp, so no help there..
This was meant as a quick-and-dirty check, so a months is not in the cards - but that second antenna/receiver is climbing on my list of priorities, in imminent danger of surpassing «doing nothing on the couch»! :) > 27. mar. 2021 kl. 16:52 skrev Dana Whitlow <k8yumdoo...@gmail.com>: > > Ole, > > If you can stand the suspense, a time error recording of a month or more > duration > would probably be pretty informative (and interesting for us to see). > > And when you speak of the maser, is that an active hydrogen maser? If so, > you're > a lucky man (unless it's in the process of dying). But there should be > scads of > diagnostics being logged, which should be enough to enable making a fairly > good > confidence check on it. > > Dana > > >> On Sat, Mar 27, 2021 at 8:33 AM Ole Petter Rønningen <opronnin...@gmail.com> >> wrote: >> >> Hi, Dana >> >> Thats the peculiar thing - these last 48 hors theres been a pretty clear >> 24 hour cycle, pointing to temperature as the culprit; but the preceeding >> 48 hours the phase shift did not follow a 24 hour period at all; the >> wheather has been all over the place, so it is hard to say.. More data >> needed! As always.. >> >> (of course, there is always a possibility that I’ve somehow bungled the >> data, and the period has been 24 hours all along) >> >> This is why I am looking for ballpark figures for the two main suspects; >> water and temperature. >> >> I guess I should bite the bullet and rig up a second receiver/antenna so I >> can take the maser out of the equation.. (and reseal the connectors >> properly) >> >> >>>> 27. mar. 2021 kl. 14:04 skrev Dana Whitlow <k8yumdoo...@gmail.com>: >>> >>> Ole, >>> >>> You did not mention whether this timing anomaly is periodic or steadily >>> growing. >>> That information could be of considerable diagnostic significance. >>> >>> Dana >>> >>> >>>> On Sat, Mar 27, 2021 at 6:08 AM Ole Petter Ronningen < >> opronnin...@gmail.com> >>>> wrote: >>>> >>>> Hi, All >>>> >>>> I am trying to chase down a 2-3-4 ns/day "anomaly" in a gpsdo I am >> working >>>> on - it could be temperature sensitivity in the antenna (cheap patch >>>> jobbie), or I suspect my sealing of the outside connectors may not be >>>> watertight. I just wanted to ask the list of anyone know of/has an >> estimate >>>> of how much the propagation delay on an N and/or SMA can reasonably be >>>> expected to change in the presence of water? is 3 ns in the right >> ballpark, >>>> or would that effect be way bigger/smaller? >>>> >>>> Likewise, does anyone have reasonably accurate figures for how much >>>> temperature could be expected to affect the delay of signals? 20 ps? 20 >> ns? >>>> Looking for some rough figures so I can look in the right direction.. >>>> >>>> I've used the same gpsdo, cable and location with a high quality antenna >>>> without seeing these effects, so I am fairly certain it is the antenna >> (or >>>> my reference maser giving up the ghost..) >>>> >>>> Thanks! >>>> Ole >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe >> send >>>> an email to time-nuts-le...@lists.febo.com >>>> To unsubscribe, go to and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe >> send an email to time-nuts-le...@lists.febo.com >>> To unsubscribe, go to and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send >> an email to time-nuts-le...@lists.febo.com >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.