Looking for 468-DC GOES receiver info
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as of this morning are:
y = -1.2954x2 + 243.1x - 10631
R2 = 0.9607
Where y is in ns, x is the Day of Year and R2 is the quality of the fit
(very good).
The first derivative (after dividing by 86400) gives:
Offset = -3E-14 * X + 243
i.e. minus 3E-14 per day.
I'll keep watching and post from time to time, maybe this will stabilize???
Have Fun,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Richard (Rick) Karlquist (N6RK) wrote:
My understanding from talking to the experts is
that no aging, or environmental effects are observable
on the 5071A, and measurements have been made into
the 10^-15 range. Also, no systematic frequency offset
has been observed down to at least 1x10^-14. IE,
frequency offset between different 5071A's is randomly
distributed with a mean within 10-14 of laboratory
standards, such as Cs fountains. Knowing the way we
overdesigned the 5071A, I am not surprised that it
is this good.
Rick Karlquist
(member of 5071A design team)
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Correction:
The first derivative should be:
Offset = -3E-14 * X + 2.8E-12
so the offset for today 20 April (day # 110) is:
Offset = -3E-14* 110 + 2.8E-12 = -5E-13.
Brooke
Brooke Clarke wrote:
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as of this morning are:
y = -1.2954x2 + 243.1x - 10631
R2 = 0.9607
Where y is in ns, x is the Day of Year and R2 is the quality of the
fit (very good).
The first derivative (after dividing by 86400) gives:
Offset = -3E-14 * X + 243
i.e. minus 3E-14 per day.
I'll keep watching and post from time to time, maybe this will
stabilize???
Have Fun,
Brooke Clarke, N6GCE
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as of this morning are:
y = -1.2954x2 + 243.1x - 10631
R2 = 0.9607
Where y is in ns, x is the Day of Year and R2 is the quality of the fit
(very good).
The first derivative (after dividing by 86400) gives:
Offset = -3E-14 * X + 243
i.e. minus 3E-14 per day.
I'll keep watching and post from time to time, maybe this will stabilize???
Have Fun,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Richard (Rick) Karlquist (N6RK) wrote:
My understanding from talking to the experts is
that no aging, or environmental effects are observable
on the 5071A, and measurements have been made into
the 10^-15 range. Also, no systematic frequency offset
has been observed down to at least 1x10^-14. IE,
frequency offset between different 5071A's is randomly
distributed with a mean within 10-14 of laboratory
standards, such as Cs fountains. Knowing the way we
overdesigned the 5071A, I am not surprised that it
is this good.
Rick Karlquist
(member of 5071A design team)
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.
-Chuck
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
In message MGEKKFGEAIKJOOPJPGIKKEEAFEAA.richard@karlquist.com, "Richard (Ric
k) Karlquist (N6RK)" writes:
My understanding from talking to the experts is
that no aging, or environmental effects are observable
on the 5071A, and measurements have been made into
the 10^-15 range. Also, no systematic frequency offset
has been observed down to at least 1x10^-14. IE,
frequency offset between different 5071A's is randomly
distributed with a mean within 10-14 of laboratory
standards, such as Cs fountains. Knowing the way we
overdesigned the 5071A, I am not surprised that it
is this good.
I think the confusion here is that drift was measured and reported
on the HP5061. But that the drift did not originate in cesium bits
of it, but rather in the electronics and magnetic shielding if I
remember right.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Hi Bill:
I wish it was something that simple, but this is a brand new unit.
Have Fun,
Brooke
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as of this morning are:
y = -1.2954x2 + 243.1x - 10631
R2 = 0.9607
Where y is in ns, x is the Day of Year and R2 is the quality of the fit
(very good).
The first derivative (after dividing by 86400) gives:
Offset = -3E-14 * X + 243
i.e. minus 3E-14 per day.
I'll keep watching and post from time to time, maybe this will stabilize???
Have Fun,
Brooke Clarke, N6GCE
Hi Chuck:
Is there something I can to do check for control loop failure?
Brooke
Chuck Harris wrote:
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.
-Chuck
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Just another idea
Might be the Cs tube is just going to stabilize its magnetic field. Is there
any possibility to degauss the tube, like with the 5061 high performance
tube? This could be a very small drift/day.
Hubert
DB7ME
-----Ursprüngliche Nachricht-----
Von: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] Im
Auftrag von Brooke Clarke
Gesendet: Mittwoch, 20. April 2005 21:01
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] Cesium DOES Drift, not
Hi Chuck:
Is there something I can to do check for control loop failure?
Brooke
Chuck Harris wrote:
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.
-Chuck
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Hi Hubert:
I don't have a degaussing device. Are the plans to make one available?
Thanks for the idea,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Hubert v. Bonhorst wrote:
Just another idea
Might be the Cs tube is just going to stabilize its magnetic field. Is there
any possibility to degauss the tube, like with the 5061 high performance
tube? This could be a very small drift/day.
Hubert
DB7ME
-----Ursprüngliche Nachricht-----
Von: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] Im
Auftrag von Brooke Clarke
Gesendet: Mittwoch, 20. April 2005 21:01
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] Cesium DOES Drift, not
Hi Chuck:
Is there something I can to do check for control loop failure?
Brooke
Chuck Harris wrote:
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.
-Chuck
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
richard@karlquist.com
Subject: Re: [time-nuts] Cesium DOES Drift, not
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Hi Brooke,
There should be some evidence that the center of the beam
current is slipping off of its peak value if it is a control
loop failure.
Perhaps you can open the loop, and use the control voltage pot
to peak the beam current and check the frequency at that point?
-Chuck
Brooke Clarke wrote:
Hi Chuck:
Is there something I can to do check for control loop failure?
Brooke
Chuck Harris wrote:
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.