[time-nuts] Re: Water in connectors

[Dana Whitlow]

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 <opronningen at 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
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