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.
