[time-nuts] Re: Water in connectors

[Ole Petter Rønningen]

Active HM, yes - nothing in the logs that corresponds, except a .5 degC diurnal temperature change - which roughly coincides with the outdoor temp, so no help there.. 

This was meant as a quick-and-dirty check, so a months is not in the cards - but that second antenna/receiver is climbing on my list of priorities, in imminent danger of surpassing «doing nothing on the couch»! :)

> 27. mar. 2021 kl. 16:52 skrev Dana Whitlow <k8yumdoober at gmail.com>:
> 
> Ole,
> 
> If you can stand the suspense, a time error recording of a month or more
> duration
> would probably be pretty informative (and interesting for us to see).
> 
> And when you speak of the maser, is that an active hydrogen maser?  If so,
> you're
> a lucky man (unless it's in the process of dying).  But there should be
> scads of
> diagnostics being logged, which should be enough to enable making a fairly
> good
> confidence check on it.
> 
> Dana
> 
> 
>> On Sat, Mar 27, 2021 at 8:33 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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