On Sat, 04 May 2013 22:00:36 -0700
Hal Murray hmur...@megapathdsl.net wrote:
mspencer12...@yahoo.ca said:
Hi, while skimming some articles I found re GPS satellites, I found some
references to certain buffer gasses in Rb cells working much better with
optical filters than others. As far
On Sun, 5 May 2013 09:53:31 +0200
Attila Kinali att...@kinali.ch wrote:
[1] I know i have some papers which anylse different buffer gasses, but
i cannot find them. I also have never seen anyone mention non-elementary
gasses like CO2.
Correction. I just remembered reading somewhere, someone
Hi, while skimming some articles I found re GPS satellites, I found some
references to certain buffer gasses in Rb cells working much better with
optical filters than others. As far as I know Rb buffer gas formulations are
not disclosed by the manufacturers so I suspect this info may not be
Hi
Buffer gas combo's are he voodoo of Rb cells. You can fiddle them to impact the
temperature coefficient of the cell. They can also improve the degradation from
impact with the cell walls. The Efratom boys came up with a way to improve
filtering with a buffer gas mixture.
Bob
On May 4,
Mark,
Hi, while?skimming some articles I found re GPS satellites, I found some
references to?certain buffer gasses in Rb cells working much better?with
optical filters than others.???
Can you reference the article?
The enhanced performance with optical filters can usually be tied with
Hi,
Buffert gas slows down the rubidium atoms, which increases the Q value.
Already that is an important factor in the performance of rubidiums.
Then, the inevitable wall-shift can be first degree compensated by the
buffer gas mixture, and in there can the details of the RF synthesis be
Corby, See p177.
http://www.pttimeeting.org/archivemeetings/2002papers/paper18.pdf
I found other references that said basically the same thing..
If you would like more info please contact me off list and I can likely send
you some more URL's.
Regards
Mark S
mspencer12...@yahoo.ca said:
Hi, while skimming some articles I found re GPS satellites, I found some
references to certain buffer gasses in Rb cells working much better with
optical filters than others. As far as I know Rb buffer gas formulations
are not disclosed by the manufacturers so I
I'm interested in these improvements too, and hope some can be
applied to other models. I don't have a 5065A, nor do I expect to
ever get one, but I do have three identical old Efratom units.
Whether it's worthwhile to modify any Rb units also depends on
whether it's possible to rejuvenate
Hi
One of the unique things about the 5065 is it's great big cells. The small cell
compact Rb's are a very different beast. There is a body of evidence
suggesting that the cell size is significant for ultra low ADEV.
The basic concepts of improving signal (light intensity) and signal to noise
In message bb988fb5-d829-4c9d-a8bd-f2c8731b8...@rtty.us, Bob Camp writes:
The basic concepts of improving signal (light intensity) and signal to noise
(filtering) would apply to other units.
I was wondering about that. The normally quoted number for change
in (detected) light intensity is
:07 AM
Subject: Re: [time-nuts] hp5065b !!!
Hi
One of the unique things about the 5065 is it's great big cells. The small cell
compact Rb's are a very different beast. There is a body of evidence
suggesting that the cell size is significant for ultra low ADEV.
The basic concepts of improving
I have a question for the list that I'm sure Corby can address but
perhaps someone else can explain as well.
Corby notes that this mod has only been effective with late series A3
modules. My question is: what change did HP make to the A3 module
(early to late) that affects the mod Corby is
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] hp5065b !!!
I have a question for the list that I'm sure Corby can address but
perhaps someone else can explain as well.
Corby notes that this mod has only been effective with late series A3
modules. My question
On 04/29/2013 11:19 PM, 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 does
is distract from
On 04/30/2013 03:38 AM, ewkeh...@aol.com wrote:
I never came to that conclusion. There is enough work out there with
results. My comment was to that particular paper that did not measure up to the
work Corby has been doing. Still trying to figure out the purpose of the
posting.
Bert Kehren
Bob,
all of the manual donloads appear to be the Nov. 1979 version only. The
A3 board is on pages 8-22 ff.
There is a high resolution 3 vol version scanned by Brian Kirby KD4FN
standing out
http://www.kennethkuhn.com/hpmuseum/scans/
Anyone has a later manual version? I would much appreciate
The multiplier and output has been changed significantly. We can not put a
finger on one part but if you reed the paper .
http://tf.boulder.nist.gov/general/pdf/1219.pdf that Bruce posted it does
explain the RF
significance.I ignored the laser part since I will not be able to duplicate,
On 05/01/2013 03:26 PM, ewkeh...@aol.com wrote:
The multiplier and output has been changed significantly. We can not put a
finger on one part but if you reed the paper .
http://tf.boulder.nist.gov/general/pdf/1219.pdf that Bruce posted it does
explain the RF
significance.I ignored the
Bob,
The new style A3 uses the same input and slighly modified output stages
from the original.
The multiplication from 5 to 60 Mhz is done entirely different.
I have two scans that copy the schematic but they are way big in size.
I'll experiment and try to make them small enough to email.
Adrian,
Thanks for the link. The manual I had was simply missing all details
related to the A3 module but this is superb. And yes, it would be nice
to see the later version.
Bert,
I'm sure most everyone would like to have the level of performance
demonstrated by the Corby modified
Corby,
Thanks. Hit send just as your post came in. :o(
I'm sure it will be interesting to see those changes.
Bob
On 5/1/2013 11:59 AM, cdel...@juno.com wrote:
Bob,
The new style A3 uses the same input and slighly modified output stages
from the original.
The multiplication from 5 to 60 Mhz
Another factor that limits the (apparent) interest is that the 5065B is
one of the most expensive and hardest to find Rb standards around. Even
on the used market the price for a 5065B in good condition can be
breathtaking. If Corby's work can be extended to other, more common
units, the
@febo.com
Subject: Re: [time-nuts] hp5065b !!!
On 05/01/2013 03:26 PM, ewkeh...@aol.com wrote:
The multiplier and output has been changed significantly. We can not
put a finger on one part but if you reed the paper .
http://tf.boulder.nist.gov/general/pdf/1219.pdf that Bruce posted
On Wed, 1 May 2013 09:26:24 -0400 (EDT)
ewkeh...@aol.com wrote:
The multiplier and output has been changed significantly. We can not put a
finger on one part but if you reed the paper .
http://tf.boulder.nist.gov/general/pdf/1219.pdf that Bruce posted it does
explain the RF
On Wed, 1 May 2013 08:59:32 -0700
cdel...@juno.com wrote:
The new style A3 uses the same input and slighly modified output stages
from the original.
The multiplication from 5 to 60 Mhz is done entirely different.
I have two scans that copy the schematic but they are way big in size.
buying an HP5065 at some point in the future. The
efforts are appreciated.
Regards
Mark S
Message: 5
Date: Wed, 01 May 2013 11:58:58 -0600
From: Ed Palmer ed_pal...@sasktel.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] hp5065b !!!
Message-ID: 518157e2.2020...@sasktel.net
Content-Type
For the last two years some of us have ben knocking at the door trying to
get passive H Maser like performance, well Corby kicked it in. More work is
needed and it starts with the A3 module. I have spend hours comparing old
and new and I am sure many of the old variety are out there.
Keeping these discussions on list would be quite helpful for us lurkers that
try to glean as much information as possible from the posts. While I may not
have the expertise to contribute often, I value the insight provided by others.
In addition, discussing on list has the benefit of having the
an HP5065 at some point in the
future. The efforts are appreciated.
Regards
Mark S
Message: 5
Date: Wed, 01 May 2013 11:58:58 -0600
From: Ed Palmer ed_pal...@sasktel.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] hp5065b !!!
Message-ID: 518157e2.2020...@sasktel.net
Content-Type: text/plain
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
!
regards,
Paul
G8GJA
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of paul swed
Sent: 30 April 2013 01:38
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP5065B !!!
I have to agree that the subjects really
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
Of paul swed
Sent: 30 April 2013 01:38
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP5065B !!!
I have to agree that the subjects really drifted. I am very excited about
what seems like a reasonable effort to improve the 5065. Since I have one
all the more
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
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
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
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 does
is distract from Corb’s accomplishments. Lets be clear, Corby has
Since performance improves as the bandwidth of the lamp spectrum
decreases its not unreasonble to suggest that a suitable laser source
may improve performance further.
The following paper (and theoretical considerations) indicate that your
conclusions regarding the potential performance of a
I never came to that conclusion. There is enough work out there with
results. My comment was to that particular paper that did not measure up to the
work Corby has been doing. Still trying to figure out the purpose of the
posting.
Bert Kehren
In a message dated 4/29/2013 6:34:24 P.M.
I have to agree that the subjects really drifted. I am very excited about
what seems like a reasonable effort to improve the 5065. Since I have one
all the more interest. So I want to hear about the reflectors and
concentrators and how they were added and then how the system may have been
retuned
On 04/28/2013 07:50 AM, Bruce Griffiths wrote:
Has anyone considered a laser pumped variant like:
http://tf.nist.gov/general/pdf/1009.pdf
Apart from the ECDL laser (can be assembled using readily availalble
parts) it looks fairly straightforward.
Bought a bunch of laser diodes of the cheap
On Sun, 28 Apr 2013 17:50:06 +1200
Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
Has anyone considered a laser pumped variant like:
http://tf.nist.gov/general/pdf/1009.pdf
Apart from the ECDL laser (can be assembled using readily availalble
parts) it looks fairly straightforward.
On 04/28/2013 02:01 PM, Attila Kinali wrote:
On Sun, 28 Apr 2013 17:50:06 +1200
Bruce Griffithsbruce.griffi...@xtra.co.nz wrote:
Has anyone considered a laser pumped variant like:
http://tf.nist.gov/general/pdf/1009.pdf
Apart from the ECDL laser (can be assembled using readily availalble
On Sun, 28 Apr 2013 14:36:16 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 04/28/2013 02:01 PM, Attila Kinali wrote:
When being at NIST last summer, they had us tour the facility. One of
them was not as much a show but a physical lab. We got to trim up and
test laser-cooling
Attila Kinali wrote:
On Sun, 28 Apr 2013 17:50:06 +1200
Bruce Griffithsbruce.griffi...@xtra.co.nz wrote:
Has anyone considered a laser pumped variant like:
http://tf.nist.gov/general/pdf/1009.pdf
Apart from the ECDL laser (can be assembled using readily availalble
parts) it looks fairly
On Mon, 29 Apr 2013 06:28:55 +1200
Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
Attila Kinali wrote:
Considered, yes, tried, no. From what i've read sofar, this system
has the problem of locking the laser wavelength onto the right
absorbtion line. IIRC the linewidth of Rb in a
To: time-nuts@febo.com javascript:;
Subject: [time-nuts] HP5065B !!!
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I call it the SUPER HP 5065A.
Any
] On Behalf Of cdel...@juno.com
Sent: Friday, April 26, 2013 8:24 AM
To: time-nuts@febo.com
Subject: [time-nuts] HP5065B !!!
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I
To: time-nuts@febo.com
Subject: [time-nuts] HP5065B !!!
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I call it the SUPER HP 5065A.
Any of these links will get you to the document
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I call it the SUPER HP 5065A.
Any of these links will get you to the document describing it.
Have a look and see what it's all
Hi Corby:
That's great.
Is there a lens system in the 5065 that shapes the light output so that it's all on the photo detector like in the
reference paper?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
cdel...@juno.com wrote:
OK, that was
Pretty cool Corby!
I have wondered about the line broadening caused by all that extra
light energy being pumped into the filter cells... Looks like you
have found the answer.
Kind of makes you wonder why nobody else has ever done the experiment?
-Chuck Harris
cdel...@juno.com wrote:
OK, that
Hi Corby,
On 04/26/2013 05:23 PM, cdel...@juno.com wrote:
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
of 4X10-13 @ 1 Second and 6X10-14 @ 100 Second?
I call it the SUPER HP 5065A.
Any of these links will get you to the
...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of cdel...@juno.com
Sent: Friday, April 26, 2013 8:24 AM
To: time-nuts@febo.com
Subject: [time-nuts] HP5065B !!!
OK, that was just to get your attention!
What do you call a modified HP 5065A that can give you an Allan Deviation
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