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.
