Hi On most “stuff” a humidity to condensation issue shows up as an abrupt change. Temperature hits a critical zone and the water comes out fairly quickly ( or dries off fairly quickly). Net result is that the curve is not as smooth as a normal temperature curve.
Bob > On Mar 27, 2021, at 9:32 AM, Ole Petter Rønningen <[email protected]> > 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 <[email protected]>: >> >> 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 <[email protected]> >>> 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 -- [email protected] -- To unsubscribe send >>> an email to [email protected] >>> To unsubscribe, go to and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] -- To unsubscribe send an >> email to [email protected] >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
