That paper appeared to describe how a laser is used to replace the
rubidium lamp more completely than later papers that achieved better
results.
I should have also included links to later papers that better illustrate
the performance that can be achieved.
Bruce
ewkeh...@aol.com wrote:
I
Interesting, I have a problem Datum 4040A as well. I purchased it several
years ago and when it fail to work correctly I put it aside. I wonder if
mine has the same problem ...
You could try powering it up and checking its telemetry with the Monitor3
program available on the Symmetricom website.
I rather agree with Bruce. What I have seen on recent improvements on laser
diode accuracy/stability results seem to imply a rather large improvement is
possible - and, as the HP5065A is a rather rare beast indeed on this side of
the Atlantic, the excellent work done by Corby is not of direct
Bruce
Thank you for the second paper. It addresses also the generation of the
microwave signal, critical to those of us that do not have the late A3 module.
I do not want to discourage any one to experiment with laser diode
pumping, but in the meantime it would be nice to work on flattening
Hi Stu,
Got your private email, but it slipped through the cracks of time.
On 04/29/2013 07:51 AM, Stewart Cobb wrote:
Guys,
I'm working on a sick FTS-4040A cesium frequency reference, which is
basically a box and power supply wrapped around the FTS-5045 cesium beam
module. (Datum bought
Look forward to your test results.
Bert Kehren
In a message dated 4/30/2013 4:27:38 A.M. Eastern Daylight Time,
paul.ree...@uk.thalesgroup.com writes:
I rather agree with Bruce. What I have seen on recent improvements on
laser diode accuracy/stability results seem to imply a rather large
Hi all,
I'm a time nut newbie. My obsession started with the search for an accurate
chronometer to carry on my boat for celestial navigation. Yes there still are a
few of us left that practice the art.
My current project is a quartz chronometer using a DS32Khz tcxo oscillator and
two
Hi Tim --
Welcome! The easiest way to search the time-nuts list is to use Google
and add the site:febo.com tag -- that will bring up hits in the list
archive (as well as anything on my web site that might be pertinent).
John
On 4/30/2013 1:49 PM, Tim Bastian wrote:
Hi all,
I'm a
n7...@yahoo.com said:
My current project is a quartz chronometer using a DS32Khz tcxo oscillator
and two 74HC4060s (+ or- 10 seconds / year).
How do you get 10 seconds per year? The data sheet says 1 minute per year.
--
These are my opinions. I hate spam.
Hi
If you take a look down in the fine print on the OCXO spec, the aging rate
is 100 ppb / year in the first year. If you are off by 0.1 ppm (100 ppb)
your clock will gain a second in less than 12 days.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
For my next project I'm looking at an Abricon Part Number AOCJY2-10.000MHZ
ocxo 5 ppb running through a pic and using the algorithm posted on
http://www.romanblack.com/one_sec.htm. I'm shooting for + or - 1 seconds /
year.
Do you have some power or size limitation? If not you can do a
12 days is 1024800 s ie just over 1 million seconds so a frequency
offset of 0.1ppm results in a time error of ~ 0.1s not 1s.
1sec error would occur in just under 116 days,
Bruce
Bob Camp wrote:
Hi
If you take a look down in the fine print on the OCXO spec, the aging rate
is 100 ppb / year
Hi
Either I need a new calculator or a new set of eyes
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bruce Griffiths
Sent: Tuesday, April 30, 2013 3:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
Hi Tim:
You might look into the DS3232 which can be combined with a PIC to control the
aging rate register.
http://www.maximintegrated.com/datasheet/index.mvp/id/4984
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Tim Bastian wrote:
Hi all,
On Mon, 29 Apr 2013 17:19:05 -0400 (EDT)
ewkeh...@aol.com wrote:
I am still sitting here trying to figure out the purpose of posting the
article on laser diode pumping of the Rb. One look at the data and it is
clear that Corby’s work far surpasses the data shown in the paper. All it
A separate thread on this topic is probably warranted.
References:
Current performance:
http://tf.boulder.nist.gov/general/pdf/1219.pdf
Comparison of CPT and IOP:
http://www.kernco.com/pdfs/TransIM03.pdf
older papers illustrating techniques required:
Attilla
No one should or will discourage you from developing a laser pumped Rb.
Bruce posted the following link. It addresses some of the issues and for me
looking at lamp Rb's is most helpful.
http://tf.boulder.nist.gov/general/pdf/1219.pdf
Bert Kehren
In a message dated
Effect of cell wall coating:
http://www2.unine.ch/files/content/sites/ltf/files/shared/Publications/2012/No%20100.pdf
Further papers on optically pumped rubidium clocks:
http://www.pttimeeting.org/archivemeetings/2011papers/Poster11.pdf
A bit OT, but back in the day there was what amounted to an X-prize for a real
accurate chronometer for navigation.
Make that way back in the day.
http://en.m.wikipedia.org/wiki/John_Harrison
Somehow I suspect everyone knows this story. ;-)
-Original Message-
From: Tim
On 4/30/13 4:18 PM, li...@lazygranch.com wrote:
A bit OT, but back in the day there was what amounted to an X-prize for a real
accurate chronometer for navigation.
Make that way back in the day.
http://en.m.wikipedia.org/wiki/John_Harrison
And he had a heck of a time collecting. I suspect
I'm looking for documentation on two HP boards that are part of a module.
The frame is labeled 05061-6168 and has an 10811-60109 oscillator, a board
labeled 05061-6199 61003F and a second board labeled 05061-6198 61103F.
Both boards are labeled “Series 2552”. The first board (6199) and
It doesn't affect the general magnitude conclusions by Bruce, but as
long as we are making corrections, my calculator seems to think
60 * 60 * 24 * 12 = 1036800 seconds in 12 days, not 1024800. That does
come out to 115.7 days for 1 sec error. Maybe the 12-day number was a typo?
-Rex
On
Close, but it's for the 105, not the 5061, and the boards are physically very
different.
The 5061A upgrade used those 105-series boards. With the 5061B, they changed
the part number of A1A3 (the OCXO interface board) from 00105-6044 to
05061-6198, but I don't see any major differences in the
Am I missing something? What actual modifications were done and how?
Jim
On 1 May 2013 07:30, ewkeh...@aol.com wrote:
Attilla
No one should or will discourage you from developing a laser pumped Rb.
Bruce posted the following link. It addresses some of the issues and for me
looking at
Buy a cheap rubidium off ebay and use it to drive a micro-controller and
write some clock software.
On 1 May 2013 11:57, Rex r...@sonic.net wrote:
It doesn't affect the general magnitude conclusions by Bruce, but as long
as we are making corrections, my calculator seems to think
60 * 60 * 24
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