[time-nuts] Temperature weirdness with Thunderbolt & Lady Heather 5

[Pete Stephenson]

Hi all,

I have a Thunderbolt and am running Lady Heather 5. I've been seeing
odd drops of ~0.7 degrees Celsius that slowly recover over around 10
minutes or so. This has happened 19 times in the last 36 hours.

Here's an image of what's happening:
http://imgur.com/a/LAvmU

The temperature in the room is not precisely controlled, but is
reasonably stable over a period of a few hours. There was no external
events (e.g. opening a window, a fan being turned on, etc.) that
correspond to those temperature drops.

Any idea what might be causing this?

Cheers!
-Pete

-- 
Pete Stephenson
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Re: [time-nuts] HP 10811 40 Hz low.

[Bob Camp]

Hi

Crystals do indeed fail. In the case of 40 Hz low, I’d look for a shorted cap 
in series with the crystal.

Bob

> On Dec 14, 2016, at 5:23 PM, paul swed  wrote:
> 
> I have a hp z3801 that is spare parts it never worked correctly. Did some
> digging and at least one major issue is the actually HP 10811 is 38 Hz low.
> It needs to be within a Hz. Checked everything feeding voltage and such and
> they are solid at 5.7V from the regulator. The varicap works as expected.
> Signal levels out are clean and correct. Temp is about 82C also inline.
> The oscillator is actually fairly simple. Do xtals just fail after many
> years?
> May see if I can map a Piezo oven oscillator into the z3801 just to see
> what if anything happens. Now that I know the warm oven signal drops fromm
> 22V to 3.8V when hot. Fake it out.
> Not sure the outer oven actually matters on the z3801. But even that can
> actually be hooked up to make any circuit that might want to know thats it
> hot happy.
> Regards
> Paul
> WB8TSL
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[time-nuts] HP 10811 40 Hz low.

[paul swed]

I have a hp z3801 that is spare parts it never worked correctly. Did some
digging and at least one major issue is the actually HP 10811 is 38 Hz low.
It needs to be within a Hz. Checked everything feeding voltage and such and
they are solid at 5.7V from the regulator. The varicap works as expected.
Signal levels out are clean and correct. Temp is about 82C also inline.
The oscillator is actually fairly simple. Do xtals just fail after many
years?
May see if I can map a Piezo oven oscillator into the z3801 just to see
what if anything happens. Now that I know the warm oven signal drops fromm
22V to 3.8V when hot. Fake it out.
Not sure the outer oven actually matters on the z3801. But even that can
actually be hooked up to make any circuit that might want to know thats it
hot happy.
Regards
Paul
WB8TSL
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[time-nuts] LH Z3801 and XP stalling

[Mark Sims]

Neither,  your computer is going to sleep.   Check the power savings / 
screensaver settings.

-

> So your saying the z3801 is going to sleep or is it Heather?
How might I change Heather to get around the issue please?
Thanks
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Re: [time-nuts] LH Z3801 and XP stalling

[paul swed]

Mark
I agree with the 3 seconds thats what I see with HP sastat, gpscontrol, and
z38XX which are all working fine. So your saying the z3801 is going to
sleep or is it Heather?
How might I change Heather to get around the issue please?
Thanks
Paul


On Tue, Dec 13, 2016 at 4:27 PM, Mark Sims  wrote:

> I suspect that your system is set up to go to sleep.
>
> If that happens Heather won't see the response to the last message it
> sent.   For SCPI receivers, Heather polls the device for a new piece of
> information every time it gets a response.  The requests alternate between
> the time code message and some receiver status value.  At xx:xx:33 Heather
> requests the syst:stat page which takes three seconds to come in.
>
> No response to a request? No new request sent out...  If a new  response
> is not seen within a receiver-dependent timeout (5-20 seconds for the
> Z3801A), Heather attempts to restart communications, but a sleeping system
> borks that.
>
> --
>
> >   So pretty excited about LH running a Z3801. But what I am seeing is a
> consitent stall roughly 45-50 minutes in.
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