The crystal is definitely hermetic. I am pretty
sure it is not thermal and is not related to the
oven. It is not even the transistor because it
is also hermetic (not so much by design but more
an accident of it being a legacy design). The
#1 suspect would be the piston trimmer that adjusts
the f
TVB noted:
If you are using the 10811 as part of a GPSDO the PLL
should take care of any number of slow-moving changes
in frequency; whether it's temperature, humidity, voltage,
OCXO ageing, DAC drift, phase-of-the-moon, etc.
So I don't see a compelling need to "protect" the OCXO
in the ways
Hi Rick:
Thanks for pointing that out. Maybe the factor is air density. I know
air density was the thing we used to monitor to jet the carbs in racing
cars.
It was better than using a barometer and/or thermometer.
Have Fun,
Brooke Clarke
--
w/Java http://www.PRC68.com
w/o Java http://www.p
> Yes, I did, because nobody else had, and I was curious. We were seeing
> changes along the lines of parts in 10^8, about an order of magnitude
> worse than tempco. This was for something like dry nitrogen purge all
> night vs 50 degrees C, 90% humidity for an hour or two.
Does anybody underst
Water vapor is actual water, simply in gas form, so if the temperature
drops quickly after a high humidity day, the vapor inside the bag will
condense before it has time to escape and you will get actual water in
liquid form in the bag, in the form of condensation.
Easy to do in Florida, happens
> packaging machinery design. The sugar wafer used in that product was
> highly hygroscopic. The main reason that product failed was that we
> weren't able to achieve sufficient shelf life despite trying all sorts
> of quite expensive multi-layer metallized wrapping "paper". Even the
> multi-lay
On Tue, 20 Jun 2006 17:54:46 -0700 (PDT), "Rick Karlquist"
<[EMAIL PROTECTED]> wrote:
>You must be kidding. No way are Zip Lok bags hermetic.
>Water vapor will diffuse right through. (Note that waterproof
>does not equal hermetic).
I have some empirical data to back this up. I recently bought
You must be kidding. No way are Zip Lok bags hermetic.
Water vapor will diffuse right through. (Note that waterproof
does not equal hermetic).
Rick N6RK
Brooke Clarke wrote:
> HI Rick:
>
> For humidity control in other applications I have used Zip-Lok bags.
> How about putting the 10811 in a Z
Yes, I did, because nobody else had, and I was curious.
We were seeing changes along the lines of parts
in 10^8, about an order of magnitude worse than tempco. This
was for something like dry nitrogen purge all night vs 50 degrees
C, 90% humidity for an hour or two.
After these horrible tests, I
> So if the 10811 is placed in a temperature and humidity controlled
> environment it will do better-just don't apply lagging etc in close
> round the actual oven assy itself?
>
> Presume the aim is to have the humidity as low as possible?
>
> What about the room temperature? I suppose the 'sw
HI Rick:
For humidity control in other applications I have used Zip-Lok bags.
How about putting the 10811 in a Zip-Lok bag and run the wires through a
hole that gets epoxy sealed? Some desiccant would lower the humidity if
that is an advantage.
Have Fun,
Brooke Clarke
--
w/Java http://www
- Original Message -
From: "Richard (Rick) Karlquist" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, June 20, 2006 5:03 PM
Subject: Re: [time-nuts] 10811 Extra Lagging etc
> Not a good idea. The best thing you could do to improve
> temp
Rick-
You've peaked my interest. Has anyone ever collected any
data on 10811 frequency vs. humidity or dew point?
-Brian, WA1ZMS
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Richard (Rick) Karlquist
Sent: Tuesday, June 20, 2006 1:03 AM
To: Discussion of
Gentlemen,
from time to time this newsgroup covers questions for software to
perform time stability analysis with, like computing Allan deviation and
related stuff. I have written a WINDOWS based utility to create nice
looking sigma-tau-diagrams for commonly used statistical measures from
raw asci
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