In a message dated 7/16/2007 22:26:14 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
I have a military OCXO sample (new product) that is supposed to be
g-insensitive and even that one has about E-09 frequency shift per 90
degrees tilt.
... and you have not put a GPS diciplining
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I guess that is why some GPS antenna cables is temperature-stabilized as well
as the cement-pidestal for the GPS antenna as it stands on solid rock. The
same
place have controlled environment for the cesiums and hydrogens,
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Yes it can make sense.
Place one Cs clock in a chamber where the ambient temperature can be
adjusted to various fixed temperatures. Compare the phase of its
5/10MHz and/or PPS outputs with respect to those of another Cs
In the article OBSERVATIONS ON STABILITY MEASUREMENTS
OF COMMERCIAL ATOMIC CLOCKS, Pekka Eskelinen claims to
have measured a phase temperature coefficient of 100ns/degree
for commercial Cs clocks in 1999.
Something is wrong with that claim. There's no way a modern
cesium standard exhibits a
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From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Tue, 17 Jul 2007 00:21:37 -0700
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I guess that is why
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From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Tue, 17 Jul 2007 00:40:49 -0700
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In the article
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I'm not sure I follow this. Yes, you will see a phase shift but how
can you tell how much of said shift is due to a fixed phase shift (as
if it were cable phase tempco) vs. how much is due to phase shift due
to frequency offset
:-)
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Tom Van Baak
Sent: Monday, July 16, 2007 9:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Cs stability
Who was it that said; every clock is a thermometer
To: time-nuts@febo.com
Subject: Re: [time-nuts] Cs stability
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om
In a message dated 7/16/2007 12:10:54 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
For example tilting the Cs unit by 90 degrees will typically give an
error
Subject: Re: [time-nuts] Cs stability
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Achieved: Acceleration sensitivities better than 2E-12/g
http://www.zyfer.com/briefings/telecom/qz%20low-g%20brfg%20olie%204-04.pdf
--
Björn
On Tue, July 17, 2007 14:40, Rob Kimberley said
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From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Tue, 17 Jul 2007 21:30:03 +1200
Message-ID: [EMAIL PROTECTED]
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Tom Van Baak
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In message: [EMAIL PROTECTED]
Tom Van Baak [EMAIL PROTECTED] writes:
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:
: In the article OBSERVATIONS ON STABILITY MEASUREMENTS
: OF COMMERCIAL ATOMIC
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In case anyone still doesn't know who I am, I need to
mention that I designed the RF electronics in the
5071A in an earlier life, circa 1990.
Now that we have that out of the way, I will agree
with Magnus that the cited paper is
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From: Richard \(Rick\) Karlquist [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Tue, 17 Jul 2007 09:52:22 -0700
Message-ID: [EMAIL PROTECTED]
Rick,
In case anyone still doesn't know who I am, I need to
mention
Hi,
I am curious about the total stability of Cs clocks. Normally producers give
you an initial accuracy after 30 minutes of power on and a table with the Allan
deviation for different measurement intervals.
After that they give you the environmental and physical specifications. For the
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In a message dated 7/16/2007 10:05:51 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
My questions are:
Are the Allan deviation specs also valid for all the environmental range,
including shock and vibration, or only for lab
Pablo Alvarez Sanchez wrote:
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Hi,
I am curious about the total stability of Cs clocks. Normally producers give
you an initial accuracy after 30 minutes of power on and a table with the
Allan deviation for different
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After that they give you the environmental and physical
specifications. For the hp5071 you have:
...
Are the Allan deviation specs also valid for all the environmental
range, including shock and vibration, or only for lab
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For example tilting the Cs unit by 90 degrees will typically give an error
of about 1E-09 or so.
Have you tried this with your FTS 4050? Anyone else do
this with a 4060 or hp 5061?
/tvb
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Tom Van Baak wrote:
The given specs are conservative (in typical HP style) but
I would guess the best ADEV numbers are only for laboratory
conditions. Someone from Agilent/Symmetricom might want
to comment on this.
In the
of precise time and frequency measurement
Subject: Re: [time-nuts] Cs stability
Tom Van Baak wrote:
The given specs are conservative (in typical HP style) but
I would guess the best ADEV numbers are only for laboratory
conditions. Someone from Agilent/Symmetricom might want
to comment
Tom Van Baak wrote:
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For example tilting the Cs unit by 90 degrees will typically give an error
of about 1E-09 or so.
Have you tried this with your FTS 4050? Anyone else do
this with a 4060 or hp 5061?
I'm pretty sure that
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Who was it that said; every clock is a thermometer?
Even a short length of coax is a thermometer if you look
close enough. See the 50 fs / °C tempco at test #6:
http://www.leapsecond.com/pages/tadd-1/
/tvb
From: Chuck Harris [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Mon, 16 Jul 2007 21:55:26 -0400
Message-ID: [EMAIL PROTECTED]
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Tom Van Baak wrote:
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From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Mon, 16 Jul 2007 19:47:10 -0700
Message-ID: [EMAIL PROTECTED]
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Who was it that said; every clock is a thermometer?
Even a short length of coax
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From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Cs stability
Date: Tue, 17 Jul 2007 01:13:58 EDT
Message-ID: [EMAIL PROTECTED]
Hi guys,
Hi Said,
I did tilt my 4050 when I first installed the unit, that number is from my
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