I just posted some photos at:
http://home.comcast.net/~rdirosario/site/?/page/HP_5061-6168_photos/
- Original Message -
From: "John Miles"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, April 30, 2013 10:53:49 PM
Subject: Re: [time-nuts] 10811
> Close, b
NB Note Bene literally "note well" per http://en.wikipedia.org/wiki/Nota_bene
I think of NB as "keep in mind"
From: Sarah White
To: Discussion of precise time and frequency measurement
Sent: Wed, May 1, 2013 6:14:56 PM
Subject: Re: [time-nuts] Atomic Watch.
I think it starts with 22 Corby will be able to tell you tomorrow. But do
not forget even earlier models will benefit with a work around of A3. Its
all in the RVFR.
Bert Kehren
In a message dated 5/1/2013 6:12:27 P.M. Eastern Daylight Time,
mspencer12...@yahoo.ca writes:
On a related no
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
Hi
Rummor has it that the single piece price in the US is $1475 for just the CSAC.
Weather that's with or without the demo board ….
Bob
On May 1, 2013, at 11:45 AM, Volker Esper wrote:
>
> Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which price
> could we expect?
>
>
Ed,
I make sequential measurements as well and create the 3-hat from the calculated
ADEV values. It's ok to do it that way. I have heard that even using
simultaneous measurements you can get negatives, but I have not verified this.
It usually means it's too close to call or you data runs are no
Yes, you're right: the radioactive decay is not involved. Anyway the CSAC
is not a primary reference (even if the Cs in used) as pointed out here
when the CSAC was first introduced. Nor a special permission has to be
asked to "wear" the CSAC.
On Wed, May 1, 2013 at 5:40 PM, Sarah White wrote:
>
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. Nothing
On 5/1/2013 4:02 PM, Poul-Henning Kamp wrote:
> In message <51815556.4050...@partiallystapled.com>, Michael Tharp writes:
>> On 5/1/2013 11:40, Sarah White wrote:
>
>> Symmetricom doesn't go out of their way to say how the damn thing
>> actually works, [...]
>
> NIST has documented that in a LOT
On 05/01/2013 10:09 PM, Ed Palmer wrote:
I recently made some measurements between 3 oscillators. It wasn't a
true 'Three-Cornered Hat' measurement because the measurements were made
sequentially. When I do the three-cornered hat calculation for the
hopefully 'better' oscillator, I end up trying
On 05/01/2013 10:02 PM, Poul-Henning Kamp wrote:
In message<51815556.4050...@partiallystapled.com>, Michael Tharp writes:
On 5/1/2013 11:40, Sarah White wrote:
Symmetricom doesn't go out of their way to say how the damn thing
actually works, [...]
NIST has documented that in a LOT of detail
Go for the CNT-90, I wish I could have one...
On Wed, May 1, 2013 at 9:35 PM, Jerry wrote:
> I am ready to make a leap and invest in a good counter that isn't 20+ years
> old. I can get a very nice shape 3Gz option 53132A or Pendulum CNT-90 for
> about the same price. I am leaning towards the
On 01/05/2013, Volker Esper wrote:
>
> Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which
> price could we expect?
And where do those spiffy little hand-steppers come from?
Searching with words I think feel appropriate has come up with some
odd results, but nothing remotely l
That is incorrect. There is a good presentation online with lots of technical
details. More details than you would find from other vendors.
Search for:
Lutwak CSAC Stanford
There are no HAZMAT or ITAR restrictions on the CSAC contrary to what this
mis-informed author claimed.
Bye,
Said
Se
On 5/1/2013 1:48 PM, Michael Tharp wrote:
((...snip...))
> As for the article, The Register is not an outlet known for precise
> reporting. Take it as a journalistic liberty.
>
> NB: Your tweet is not visible to me, so it's somewhat difficult to
> fact-check :-)
>
> -- m. tharp
I deleted the t
On Wed, 01 May 2013 13:48:06 -0400
Michael Tharp wrote:
> On 5/1/2013 11:40, Sarah White wrote:
> > I tweeted the author of this article, trying to point out that (as I
> > understand) "radioactive decay" is not relevant in any way for cesium
> > frequency standard/reference thingies:
> >
> > htt
On a related note does any one know the likely serial number ranges of the
HP5065's that would benefit from this treatment ? (Or is there any other easy
way to tell the units appart ?)
Thanks to all concerned for the effort put forwards on this project. It may
sway me towards actually buy
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.
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
> sig
I recently made some measurements between 3 oscillators. It wasn't a
true 'Three-Cornered Hat' measurement because the measurements were made
sequentially. When I do the three-cornered hat calculation for the
hopefully 'better' oscillator, I end up trying to take the square root
of a negative
In message <51815556.4050...@partiallystapled.com>, Michael Tharp writes:
>On 5/1/2013 11:40, Sarah White wrote:
>Symmetricom doesn't go out of their way to say how the damn thing
>actually works, [...]
NIST has documented that in a LOT of detail, they're the ones who
came up with it.
--
Poul-
I am ready to make a leap and invest in a good counter that isn't 20+ years
old. I can get a very nice shape 3Gz option 53132A or Pendulum CNT-90 for
about the same price. I am leaning towards the Pendulum but I am worried
that if either needed any repair, there is so much more parts, service
com
I inquired with Symmetricom here in France just after their announcement and
was quoted 1500euros for the development board.
Le 1 mai 2013 à 17:45, Volker Esper a écrit :
>
> Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which price
> could we expect?
>
> Volker
>
>
>
I agree with Magnus; I find it interesting to learn more about what can be
done at the non-industrial level just for fun.
But I certainly will not attempt to add to the discussion on a subject where
I have no expertise, only curiosity. I am fascinated that there is the
capability at the hobby leve
CSAC was discussed here in Jan, 2011 and was USD 1500 for low volume. It is
a Cs-vapor cell sort of Cs used like an Rb.
On Wed, May 1, 2013 at 5:45 PM, Volker Esper wrote:
>
> Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which
> price could we expect?
>
> Volker
>
>
> Am 01
> Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which
> price could we expect?
>
> Volker
Contact your Symmetricom sales office. Some were even on eBay last year.
Since it's lunch time here, enjoy two photos showing how small a CSAC is:
http://leapsecond.com/pages/csac/tvb-
You are not wrong. I noticed the error myself. There no radioactive decay
involved. These devices were discussed in detail a while back here.
Lots of drooling and wringing of empty wallets.
Le 1 mai 2013 à 17:40, Sarah White a écrit :
> On 5/1/2013 8:43 AM, Stephen Tompsett (G8LYB) wrote:
>>
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 leve
> Folks,
>
> I asked about 3 cornered comparisons some time ago, and now have plenty
> of data to start exploring, and way more than the 3 oscillators I had
> when I asked six months ago.
>
> Apart from Stable32, which I do not have access to, are there any free
> tools which will allow me to
Corby my manual only covers up to 1908a
Sounds like you have far newer info than me.
Regards
Paul
WB8TSL
On Thu, Apr 25, 2013 at 3:16 PM, wrote:
> Hi Everyone,
>
> Does anyone have the change sheets that apply to the prefix 2816A.
>
> I only have the one that covers up to prefix 2740A.
>
> Than
On 5/1/2013 11:40, Sarah White wrote:
I tweeted the author of this article, trying to point out that (as I
understand) "radioactive decay" is not relevant in any way for cesium
frequency standard/reference thingies:
https://twitter.com/kuzetsa/status/329618223916011520
If someone more authorita
On 5/1/2013 11:40 AM, Sarah White wrote:
> On 5/1/2013 8:43 AM, Stephen Tompsett (G8LYB) wrote:
>> http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_watch_movement/
>>
>
> Stephen, fellow time nuts,
>
> [DISCLAIMER] I should really know better than to attempt internet
> discussi
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
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 5065's.
You are correct - radioactive decay has nothing to do with atomic clocks.
David
On 5/1/13 11:40 AM, Sarah White wrote:
On 5/1/2013 8:43 AM, Stephen Tompsett (G8LYB) wrote:
http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_watch_movement/
Stephen, fellow time nuts,
[DISCLA
Hi, Tim:
For what it is worth I've been down a similar road using various crystal
controlled lab frequency standards to drive internet time servers. (I'm more
of a plug and play person these days.) Some of these lab standards feature
external DC power inputs and have a fairly low power
I got this reply from a researcher friend:
A better link might be
http://www.npl.co.uk/science-technology/time-frequency/optical-frequency-standards-and-metrology/
---
> Date: Mon, 29 Apr 2013 06:11:15 -0700
> Subject: Re: [time-nuts] laser locking
> From: j...@quikus.com
> To: time-
Cool. Is the Symmetricom CSAC SA.45s available to "mere mortals"? Which
price could we expect?
Volker
Am 01.05.2013 14:57, schrieb Poul-Henning Kamp:
Looks a fair bit more comfortable than the one Tom's brother showed.
http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_wat
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.
Cor
On 5/1/2013 8:43 AM, Stephen Tompsett (G8LYB) wrote:
> http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_watch_movement/
>
Stephen, fellow time nuts,
[DISCLAIMER] I should really know better than to attempt internet
discussions or comments first thing after waking up. Didn't st
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 laser
Thinking what I would like for myself as my birthday coming soon..
A wrist watch! (I haven't worn one for 30 years)
Internal reference like 10Mhz or any suitable frequency.
Ability to pick up a near RF field and calibrate itself.
A base Rb unit that would radiate a signal to the watch and even ch
It seems that a free tool is not available but from the relations found
here http://www.ke5fx.com/timelab/readme.htm I can write a simple processor
to implement the extraction of the desired data from the couples Sab, Sac,
Sbc
On Wed, May 1, 2013 at 2:36 PM, David Hooke wrote:
>
>
> Folks,
>
>
http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_watch_movement/
--
Stephen Tompsett (G8LYB)
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow th
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,
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 t
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
Well
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 Corb
Looks a fair bit more comfortable than the one Tom's brother showed.
http://www.theregister.co.uk/2013/05/01/hoptroff_shows_first_atomic_watch_movement/
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.
Folks,
I asked about 3 cornered comparisons some time ago, and now have plenty
of data to start exploring, and way more than the 3 oscillators I had
when I asked six months ago.
Apart from Stable32, which I do not have access to, are there any free
tools which will allow me to perform 3 co
Hi
There is a lot of differences between SRD's in terms of flicker / shot
noise. I'd bet they changed the multiplier design.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert Darby
Sent: Wednesday, May 01, 2013 7:25 AM
To: Dis
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 ma
Hi
It was tired old eyes and tiny numbers on the calculator ….That plus to much
distraction to double check things.
Bob
On Apr 30, 2013, at 9:57 PM, Rex wrote:
> It doesn't affect the general magnitude conclusions by Bruce, but as long as
> we are making corrections, my calculator seems to
On Tue, 30 Apr 2013 13:49:43 -0400
"Tim Bastian" wrote:
> 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 chr
On Tue, Apr 30, 2013 at 7:40 PM, Jim Palfreyman wrote:
> Buy a cheap rubidium off ebay and use it to drive a micro-controller and
> write some clock software.
That was exactly my solution but I'm waiting ti hear about his size,
power and cost budget. If this has to run on Battery power for the
e
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