[time-nuts] Re: Water in connectors

[Bob kb8tq]

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 <opronningen at 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 <k8yumdoober at 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 <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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