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-Original Message-
From: Bill Beam
To: Discussion of precise time and frequency measurement ;
n3izn ; time-nuts
Sent: Thu, Nov 3, 2016 08:46 PM
Subject: Re: [time-nuts] Lady Heather and LeapSecond
Yes. See attached.
On Thu, 3 Nov 2016 22:27:36 -040
Derek moved to Science:
http://blogs.sciencemag.org/pipeline/
His last Things I Won't Work With was September 2016:
http://blogs.sciencemag.org/pipeline/archives/category/things-i-wont-work-wi
th
Dave
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behal
Hi Bert:
Have you looked into the Stanford Research PRS-10? It a current production Rb standard with internal provision to sync
to 1 PPS.
http://prc68.com/I/PRS10.shtml
You can choose to run it like a GPSDO but it needs an external 1 PPS for that (there is no GPS receiver in the PRS-10).
Or,
Will Lady Heather show the leap second using a thunderbolt?
chris
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Suitable ECDL laser for Rb
clock:https://www.sacher-laser.com/home/industrial-lasers/point_and_line_laser_module.html
the 784.8 nm version has 0.2nm of tuning range,
Bruce
On Friday, 4 November 2016 2:43 PM, Tim Shoppa wrote:
Zero. But the answer is also zero for a Rb or Cs cell!
On T
Mike,
thank you.
Found several versions on the net, which one is the "best" version to try?
TIA.
Giuseppe Marullo
IW2JWW - JN45RQ
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Zero. But the answer is also zero for a Rb or Cs cell!
On Thu, Nov 3, 2016 at 8:59 PM, Bob Camp wrote:
> Hi
>
> Ok, how many full performance Hydrogen Masers can you build (size is not
> an issue) and
> deliver for < $10,000 (2X Bert’s number) ?
>
> Bob
>
> > On Nov 3, 2016, at 8:55 PM, Tim Sho
Yes you are correct. All of the devices I am working with have OCXO's,
it was a type
or a brain short.
Pete.
On 11/3/2016 9:07 PM, Paul Alfille wrote:
By the way, the HP5370B has a OCXO, not TCXO. It needs a while to become
stable, but should be quite consistent after that.
On Thu, Nov 3,
By the way, the HP5370B has a OCXO, not TCXO. It needs a while to become
stable, but should be quite consistent after that.
On Thu, Nov 3, 2016 at 4:50 PM, Nick Sayer via time-nuts wrote:
> I’m going to try and describe my thoughts, but it may not come out as
> “right” as some others here can do
Hi
Ok, how many full performance Hydrogen Masers can you build (size is not an
issue) and
deliver for < $10,000 (2X Bert’s number) ?
Bob
> On Nov 3, 2016, at 8:55 PM, Tim Shoppa wrote:
>
> It would obviously be larger than a homebrew Cs, but why not a homebrew
> Hydrogen Maser Frequency st
It would obviously be larger than a homebrew Cs, but why not a homebrew
Hydrogen Maser Frequency standard?
The commercial Cs units always seemed objects of pure miniaturized hi-tech
materials science magic, while the Hydrogen Masers I've seen seem much
larger-scale\ and more a matter of vacuum plu
On 03/11/16 05:17, Howard Davidson wrote:
HP 10544
Hi, regarding the HP 10544's, where in the world are you ?
Many thanks
Mr Smiley
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Hi
Not many people have had exposure to Rb’s or Cs standards actually being
built. That leaves a major gap in who you can call when you run into a problem.
Until you have tried to build one it’s not at all clear just how much “missing
information” there
is in all those papers. It’s very much l
Hi
Do you believe that they could produced in volume for < $1,000 each without
any significant setup investment?
Bob
> On Nov 3, 2016, at 7:52 PM, Bruce Griffiths
> wrote:
>
> Attached graph indicates ADEV achieved with a 25mm double resonance Rb vapour
> cell
> Performance appears somewh
Attached graph indicates ADEV achieved with a 25mm double resonance Rb vapour
cell
Performance appears somewhat better than HP5065A (even Corby's souped up
version).
The thesis (by Thejesh N. Bandi) on this double resonance Rubidium vapour cell
in a Magnetron style cavity was completed at the
There is at least one recent thesis where a dual resonance rubidium vapor cell
was built and used to lock a low noise OCXO,The machining of the cavity didnt
appear particularly challenging nor did the locking of the laser to the
relevant wavelength using an auxiliary rubidium vapour cell.IIRC th
> Le 3 nov. 2016 à 16:41, Giuseppe Marullo a écrit :
>
>> Have you tried the stock Thunderbolt?
>
> Not yet,
>
> package is coming from China, like twenty days+ waiting before getting it.
>
> Supposing the box will only make the serial port(s) available, where I could
> find the software for
On Thu, 3 Nov 2016 16:54:24 -0400
Bob Camp wrote:
> If you look at a modern CPU as “just a handful of sand and some stuff”, it
> seems
> pretty easy to build one in the kitchen after an hour or two of setup. When
> you dig
> into the nasty details the line costs rapidly spiral off into the
> s
On 11/3/16 1:54 PM, Bob Camp wrote:
Hi
Since you can *buy* a working Rb that runs to a given level. My assumption is
that
the objective is to do something that is significantly better than you can get
for $100
or less. I see no point in setting up to build a device that it 10X worse and
cost
On Thu, 3 Nov 2016 16:37:06 -0400
Ruslan Nabioullin wrote:
> What about instead establishing an open-source hardware project for a
> frequency standard fusor? I was researching COTS solutions for this for
> my rubidium ensemble and could only find this one product, which
> obviously should be
Kickstarter?
> On 2016 Nov 03, at 16:07 , Bert Kehren via time-nuts
> wrote:
>
>
> Over the past there has been talk about building from scratch high
> performance references. I think consensus was that it is out of reach. In
> the mean
> time Corby is reworking an active maser which take
On a somewhat related note
Several years ago I pondering getting a Cs standard. After considering the
performance of my references and my stack of time interval counters I concluded
that in practice I could more or less get the level of measurement accuracy I
wanted by comparing the "devi
On Thu, 3 Nov 2016 16:07:59 -0400
Bert Kehren via time-nuts wrote:
> Let me get to the real issue. There are not enough HP5065A’s out there and
> not affordable for all time nuts. Most are being kept and are not for
> sale. But if a combined effort by many time nuts it MAY be possible to
>
On 11/3/2016 1:07 PM, Bert Kehren via time-nuts wrote:
Over the past there has been talk about building from scratch high
performance references. I think consensus was that it is out of reach. In the
mean
I was on the design team for the HP 10816 mini rubidium
which leveraged the production
Hi
Since you can *buy* a working Rb that runs to a given level. My assumption is
that
the objective is to do something that is significantly better than you can get
for $100
or less. I see no point in setting up to build a device that it 10X worse and
costs 10X
more money.
Making the physics
I’m going to try and describe my thoughts, but it may not come out as “right”
as some others here can do. Still…
One problem you’re going to run into if you go down the road of attempting to
PLL one thing to another is that you have to find a balance between phase
control and frequency stabilit
On 11/03/2016 04:07 PM, Bert Kehren via time-nuts wrote:
Over the past there has been talk about building from scratch high
performance references. I think consensus was that it is out of reach.
What about instead establishing an open-source hardware project for a
frequency standard fusor?
Over the past there has been talk about building from scratch high
performance references. I think consensus was that it is out of reach. In the
mean
time Corby is reworking an active maser which takes a lot of know how. But
let us look at his work on the super HP5065. It is able to outpe
In message
, paul swed writes:
>Or is it even possible for a strong magnet to get through the shields as is
>and influence the state selectors?
No.
Because it is not the strength of the magnetic field (as in TWT's)
but the gradient of the magnetic field which is important.
It is
Bob has stated this, but perhaps not emphasized that, when you sample the
phase of a 10 MHz clock once a second, you are essentially folding the 20
millionth nyquist band down to baseband. So you can alias any integer
multiple of 1 Hz as if it were 10 MHz, i.e. 10 MHz + 1Hz will hold phase to
1 Hz
Hi
If your TCXO is off by 1 ppm, it will slip 10 cycles per second at 10 MHz.
If it is off by 0.1 ppm it will slip a full cycle at 10 MHz.
If it is off by 0.01 ppm *and* uses some sort of digital compensation, it will
hop around.
If the GPS is not sawtooth corrected it will hop by a good fracti
The signals on the DB9 connector are at RS232 levels, your GPS module is
likely 3V3 CMOS, you will need to make a level translator if you wish to
use a standard PC RS232 serial port.
On Thu, Nov 3, 2016 at 12:58 PM, STR . wrote:
> Hello again list and Paul,
>
> The USB and Mini-PCIe converters I
Hello again list and Paul,
The USB and Mini-PCIe converters I ordered from Ebay China have not shown up
yet.
It appears PC Engines may take a while to release the custom BIOS that
exposes UART3 and 4 on the APU2 :/
In the interest of getting this working without waiting on a BIOS I will try
conn
Wasn't there some chatter on this forum about this seller a few months
ago ?
Yes,
but *hopefully* was just about the two output of the unit (supposing it
was the same, it was not mentioned in the post). Another "problem" by
itself to double check.
Seems that I found someone that has this un
You can also use your counter to directly measure your GPS receiver's 1PPS,
which ends up being the error of your internal timebase. (plus the error in
your 1PPS)
On Thu, Nov 3, 2016 at 8:20 AM, Peter Reilley
wrote:
> I am the proverbial man with too many clocks and I don't know what time it
> i
Hi Li,
The "Low cs signal with max Emult" is the classic error indicating it's out of
gas. That's a bad sign. But the "9.2GHz PLL test 10.3v" is something else. So
maybe there's hope? Or maybe you have two big problems instead of one. Rick
might know.
For additional information, connect a PC t
Wasn't there some chatter on this forum about this seller a few months ago ?
A search of the archives might be in order.
73, Dick, W1KSZ
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Giuseppe
Marullo
Sent: Thursday, November 03, 2016 8:42 AM
To: Dis
There is a problem with you plan.You are looking at the relative phase
of a reference pule and an oscillator, just once.The pulse moves
around, even on a good GPS receive. So what you really have to do is
compare the phase of the oscillator to the AVERAGE phase of the reference.
You have
Have you tried the stock Thunderbolt?
Not yet,
package is coming from China, like twenty days+ waiting before getting it.
Supposing the box will only make the serial port(s) available, where I
could find the software for the "stock" Trimble module it has inside?
AFAIK it is different from Th
Hi
Today I met one HP 5071A with option 001 at one secondhand equipment company.
This one can not enter CONTINUOUS OPERATION status, the ATTENTION led flashes.
There is a "Low cs signal with max Emult" error in the log. I have run the
self-test, and it stopped at "9.2GHz PLL test 10.3v". I
Have you tried the stock Thunderbolt?
On Thursday, November 3, 2016, Giuseppe Marullo wrote:
> Just ordered one of these:
>
> http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.
> l2649&ssPageName=STRK%3AMEBIDX%3AIT
>
> Asked the seller for documentation and or software but still he did
Hello to the group.
Thanks to all of the fine pictures and discussions on C tubes it has me
thinking a lot about what actually happens in a mighty old tube.
We always assume the tube has used up the Cesium as to why there is no beam
current. The dead tube answer.
But because of all the details shar
Tom
I may ask for the paper offline. Though kind of wonder how much sense I
will make of it.
What I am reading is that increasing the temp of the oven in an end of life
tube can indeed increase the signal. Maybe it doesn't shift the spectrum or
resonance. That would tend to suggest my funny offset
Well, which 1PPS is the trigger? Is it from a "bare GPS"?
Even the GPS timing units will have the (un-sawtooth-corrected) PPS phase
make jumps by 20ns to 40ns peak-to-peak and that's a significant portion of
the 100ns period of your 10MHz.
Typical unsawtooth-corrected PPS phase jumps:
http://www
Pete,
Tell us about your trigger: where is it?
Regards,
Antonio/CT1TE
---
A 2016-11-03 12:20, Peter Reilley escreveu:
> I am the proverbial man with too many clocks and I don't know what time it is.
> To correct this situation I have decided to calibrate everything.
>
> I have a HP 5370B
"Danger Wil Robinson"
There you go good old time nuttery. Pete its bad to start to compare
things. Because then you have questions. That leads to the need for a
better reference.
Around and around it goes.
TCXO's for my 2 cents really tend to introduce variables. Yes better then a
free standing
I am using the 1 PPS for the trigger.
Pete.
On 11/3/2016 8:59 AM, Antonio A. S. Magalhaes wrote:
Pete,
Tell us about your trigger: where is it?
Regards,
Antonio/CT1TE
---
A 2016-11-03 12:20, Peter Reilley escreveu:
I am the proverbial man with too many clocks and I don't know what
time
Just ordered one of these:
http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Asked the seller for documentation and or software but still he didn't
send me anything.
Did anybody buy one as well? Could you please share what you have that
could be u
I am the proverbial man with too many clocks and I don't know what time
it is.
To correct this situation I have decided to calibrate everything.
I have a HP 5370B, a HP 6370A, and a HP 5328A all with the TCXO
option. I also
have some TCXO modules. I figured that I would calibrate them again
> Never heard that story. You gotta love it: a hot rod atomic clock.
>
> Rick
A well-written, very readable version of the story is in here:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1977_04.pdf
and the technical paper with all the details of the experiment is here:
On Thu, 3 Nov 2016 17:38:23 +1100
Michael Wouters wrote:
> > If i were able to build a working optical clock, i would just buy
> > a frequency comb. The 10k€ for a comb would be cheap compared to the
> > money spend on the rest of the clock :-)
>
> Hmm, not sure what you're looking at, but I hav
Hi Tom,
That's more relevant text. Thanks.
Cheers,
Magnus
On 11/03/2016 08:34 AM, Tom Van Baak wrote:
Hi Magnus,
About the high-perf CBT, I wrote: "The difference would be in things like the oven
temp and detector gain, both of which are controlled outside the tube. My first hint of
this wa
Hi Magnus,
About the high-perf CBT, I wrote: "The difference would be in things like the
oven temp and detector gain, both of which are controlled outside the tube. My
first hint of this was in a paper by Carroll Alley."
Since you're curious, let me explain the hint in the paper by Alley [1][2]
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