Maybe I missed it, but did somebody think about the uBlox LEA-6 rx? has
two timemark outputs, which are programmable.. so you can have both 1PPS
and 1000PPS.
Achim
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Chris Albertson albertson.ch...@gmail.com wrote:
It's even less logical than that. With rubber seconds tied to the
Earth's rotation. You ultra stable cesium clock is no longer running
at a fixed frequency.
Wait a minute here, Chris... Weren't you just telling me the other day
how
That said of all the systems I like the Mayan one best. They defined
the year as 360 days. Then after 360 days they stopped counting and
had a party while they waited for the priest to watch the sun and
declare the start of a new year. They got a week off.
Chris Albertson
Redondo Beach,
On Tue, 02 Aug 2011 21:18:17 -0500
Scott Newell new...@cei.net wrote:
The general shape and bumps in the plots track nicely, but I'm
wondering why there's so many cycles difference after 36 hours.
Could be a measurement error (like losing ticks or something).
Have you ploted the difference
On Wed, 03 Aug 2011 07:39:28 +0200
Achim Vollhardt avoll...@physik.uzh.ch wrote:
Maybe I missed it, but did somebody think about the uBlox LEA-6 rx? has
two timemark outputs, which are programmable.. so you can have both 1PPS
and 1000PPS.
I thought the same when reading this discussion.
The
On 08/03/2011 11:19 AM, Attila Kinali wrote:
On Tue, 02 Aug 2011 21:18:17 -0500
Scott Newellnew...@cei.net wrote:
The general shape and bumps in the plots track nicely, but I'm
wondering why there's so many cycles difference after 36 hours.
Could be a measurement error (like losing ticks
On Tue, Aug 2, 2011 at 09:18, Michael Sokolov msoko...@ivan.harhan.orgwrote:
2. When/if the muggle/mainstream UTC stops being acceptable as a form
of mean solar time (i.e., when DUT1 passes the 1.0 s mark and no leap
second is inserted to correct for it), I will take the matters into
my
2. At the higher user-friendly level, rubber duckies like the one I'm
about to build take this fancy non-Earth-rotation-based techie time
as input and produce old-fashioned Earth orientation time on output,
or more precisely produce a synthetic timescale that is rubberized to
On 8/2/11 10:47 PM, David J Taylor wrote:
That said of all the systems I like the Mayan one best. They defined
the year as 360 days. Then after 360 days they stopped counting and
had a party while they waited for the priest to watch the sun and
declare the start of a new year. They got a week
Hi, Scott,
They track because most of Arkansas is part of the Eastern Interconnection
and the transmission systems are tied together through that. The general shape
follows the loading of the system; that is, as the load increases throughout
the day the alternators slip behind; as it
http://news.stanford.edu/news/2010/august/sun-082310.html
Suppose time has variations, instead of the decay rate??
:))
-John
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Le 03/08/2011 17:32, Francis Grosz a écrit :
Hi, Scott,
Here in New Orleans a friend in the power company who was interested in
its history told me a story. In the very early days, frequency control was
pretty poor and it was hard to keep up with the changing load. So by 5 PM every
Wondering whether anyone can clarify what discpline the Boulder, CO facility
is broadcasting...
It appears to be about 20 seconds slower than UTC and I could not find the
relation to other known time scales like TAI, UTC, ET, UT1, GPS or possibly
grid or broadcast-interconnected reference.
Thanks
Hello Folks,
New nut here.
I have posted a graph here. http://www.rescueelectronics.com/FREQUENCY.html
First time doing this sort of thing.
There is a comparison made between a z3801 GPS 10 MHz and a WWVB locked 10
MHz
Could someone please look at it and validate my assumptions?
Being new to
Looking at the graphs. What a mess. :-) Love LF propagation.
Do not have a conclusion but I do see some of the same behaviors.
Regards
Paul
WB8TSL
On Wed, Aug 3, 2011 at 1:05 PM, Paul A. Cianciolo pa...@snet.net wrote:
Hello Folks,
New nut here.
I have posted a graph here.
On 8/3/2011 11:15 AM, J. Forster wrote:
http://news.stanford.edu/news/2010/august/sun-082310.html
Suppose time has variations, instead of the decay rate??
:))
-John
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In message 7E45E47B20184CC0A55D72835D82A1F9@FBG3, Francis Grosz writes:
Still, elimination of TEC is idiotic. [...]
Well, depends, doesn't it ?
If you care more about having antique timepieces keeping time
somewhat ok when the grid is stable, it certainly is idiotic.
The bit of the
Hi Paul,
Between prop delays and the carrier level modulation in the graph, it does
look pretty bad.
But as soon as you unlock the oscillator, it goes on its merry way with a
very clean sawtooth.
The direction of drift is what bothers me. I have a lot to learn about
crystal oscillators.
Not only the laptops and their batteries.
Since most everything now has a switching supply with constant input power,
when the voltage sags, the current goes up instead of down.
Does not help.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original
Hi John:
Very interesting. I wonder if it's something that can be observed in a
home system?
I've got some radioactive samples and various counters that detect their
particles as well a precision time equipment.
http://en.wikipedia.org/wiki/Radioactive_decay#Changing_decay_rates
Have Fun,
Hi Brooke,
Maybe. The photon counting gear is pretty trivial. You'd need:
A scintillator
A PMT (Photo Multiplier Tube) and HV stable HV PS.
A preamp
A SCA (Single Channel Analyzer). These can be built.
A counter, stable time base, and data recorder
The main difficulty, IMO, would be getting a
In message 2067.12.6.201.209.1312398859.squir...@popaccts.quikus.com, J. For
ster writes:
The main difficulty, IMO, would be getting a sufficient sized lump of the
material. Chunks of Cs don't grow on trees, at least not where I live.
For that you should try a couple of hundred miles north of
You can buy a variety of isotopes from
http://www.spectrumtechniques.com/disclaminated_sources.htm
Just don't go as far as the Radioactive Boy Scout and it shouldn't get you
in any lists that call you to the side in airports...
http://www.dangerouslaboratories.org/radscout.html
-Original
The earth has several feedback systems, some positive and some
negative and they each run on different time scales. One simple
example is that if it's colder it snows more. Snow covered ground
reflects sunlight back to space and make the earth even colder. This
is positive feedback. But if
On 8/3/11 12:14 PM, J. Forster wrote:
Hi Brooke,
Maybe. The photon counting gear is pretty trivial. You'd need:
A scintillator
A PMT (Photo Multiplier Tube) and HV stable HV PS.
A preamp
A SCA (Single Channel Analyzer). These can be built.
A counter, stable time base, and data recorder
The
Well...
1 Ci = 3.7×10E+10 decays per second, so 10 uCi = 3.7x10E+5
So, if the counting interval was 1 second, one can expect 370,000 +/- 6000
counts.
The count rate seems reasonable for easily available equipment. Longer
count times are, of course, needed to get the 6000/370,000 number down.
Hi Jim:
The problem I'm having is that just counting the clicks from a source is
a way to get random numbers. If you average the clicks over a large
amount of time and plot that average, it will decrease over time. So to
see the change in decay rate the source needs to have a short
You measure the number of counts in a constant time interval. That gives
you a rate, which is predictable from the known half-life of the source.
What you are looking for ius deviations from the rate that correlate wqith
the sun's rotation (or something else).
The best way might be to measure
Hi John:
Yes. I think using the isotope with the shortest half-life will make
for the most sensitive measurement, nest pas?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
J. Forster wrote:
You measure the number of counts in a constant time interval.
In message 4e39c16d.9020...@pacific.net, Brooke Clarke writes:
Yes. I think using the isotope with the shortest half-life will make
for the most sensitive measurement, nest pas?
Not so fast, or rather: not too fast. You need to be able to detect
as high a percentage of all events as possible,
Hi
What is the Z3801 saying it's doing if you hook it up to a computer? There are
several programs out there that will give you a pretty good idea of what's
going on inside the beast.
Bob
On Aug 3, 2011, at 1:05 PM, Paul A. Cianciolo wrote:
Hello Folks,
New nut here.
I have posted a
Hi
Since the same setup is also a fairly good random number generator, you *will*
find correlations. Proving that they are significant is the hard part.
Bob
On Aug 3, 2011, at 5:39 PM, J. Forster wrote:
You measure the number of counts in a constant time interval. That gives
you a rate,
On 8/3/11 2:20 PM, Brooke Clarke wrote:
Hi Jim:
The problem I'm having is that just counting the clicks from a source is
a way to get random numbers. If you average the clicks over a large
amount of time and plot that average, it will decrease over time. So to
see the change in decay rate the
Jim,
That's why I suggested a scintillator, PMT, and SCA. The intensity of the
detected light pulses varies w/ the energy of the decay. The SCA has upper
and lower levels (a window) so only the decays of the wanted isotope,
lying in the window, are detected. Decay product events will be screened
Paul
Have not thought this through very well.
But it is what time-nuts is about.Assuming your 3801 is locked and checked
as Bob suggests. It puts out a 10 mc signal. At least mine does. Well if you
stuck that into the oscillators output instead of the VCO. Guess what? You
sort of just have
That was a very interesting article. I'd vote for the neutrinos -
they must be good for something. Hey, what if neutrinos are actually
what makes radioactive decay possible, and the randomness of the
decays is just the randomness of arrival of the right kind of
neutrino or combinations of them
Hi All,
I know that I'm not a regular around here - but just a few things to
consider in this discussion.
Whilst measuring the rate of decay in a single detector signal is
representative of the decay rate of an isotope, the errors associated with
doing so are non trivial. In addition to this,
Hello Bob,
I cannot honestly say I know the answer to that question. I assume it's
working properly.
For a test I am doing another 24 hour run with the WWVB receiver unlocked,
just removed the antenna.
That will get posted tomorrow.
Can tell me one of the programs that are used to monitor the
Hi all--
Long story short, a department at a university needs to get rid of a
bunch (5-6 file cabinets worth) of 80's vintage user and service
manuals for Tek (mostly) and HP equipment. Oscilloscopes, generators,
etc. 70s/80s/90s vintage?
The guy in charge (not me) of this is really trying to
HI
Try:
Z38XX from http://ulrich-bangert.de/html/downloads.html
It works fine with my 3801's and it's free.
My guess is that the 3801 is not running right.
Bob
On Aug 3, 2011, at 8:09 PM, Paul A. Cianciolo wrote:
Hello Bob,
I cannot honestly say I know the answer to that question.
See comments below
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: Wednesday, August 03, 2011 6:31 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Observations and opinions needed on
PLEASE contact Dave at ArtekMedia (dot) com. He is the best resource I
know for manuals.
I'm far less impressed with university resources for such things. IMO,
the stuff jusr vanishes.
Dave's business is scanning manuals so everybody can have them for very
reasonable prices.
YMMV,
-John
I think you misunderstand my suggestion. Forget the efc it should replicate
the phase errors your seeing. Granted anyplace in that chain you could have
a failed or failing component. I don't think you do.
My suggestion is this. If your 3801 is working and Bobs right about the 3801
software, I use
I have to agree with John. Dave is reasonable and does a really excellent
job.
Well worth his price and he has gotten me out of a jam many times.
On Wed, Aug 3, 2011 at 8:56 PM, J. Forster j...@quikus.com wrote:
PLEASE contact Dave at ArtekMedia (dot) com. He is the best resource I
know for
If only the Google digitization project would take these on...
http://books.google.com/support/bin/answer.py?hl=enanswer=43741 as it has with
the local school's
libraries: http://www.lib.umich.edu/michigan-digitization-project/michigan-digitization-project-complete-list-resources
Bob
I'd much rather see a commercial venture holding this stuff.
IMO, university libraries really do not give a damn about what working
engineers really need. It's all for professors and there is very little to
do with actual hardware other than some journals like RSI.
I virtually never found
Just a note on the 8165: the primary output is from a decent quality
OCXO that's in an FLL (not PLL) circuit. The basic idea is that there
is a counter with a 1000 second gate time generated from (I think) a 10
MHz crystal that is tightly locked to WWVB with a very short time
constant.
Hi John,
You are quite correct ! In researching this WWVB receiver for Paul, it turns
out
that Spectracom just got way too complicated with their design making it a very
hard circuit to work on for the uninitiated. Really, the design was done as
part
of a total system of which the 8165 (and
At 05:00 AM 8/3/2011, Magnus Danielson wrote:
On 08/03/2011 11:19 AM, Attila Kinali wrote:
Could be a measurement error (like losing ticks or something).
Have you ploted the difference between both? For me it looks as
the difference is (nearly) linearly growing over time, but it's
hard to tell
I'll 3rd DAVE is the way to go. And when he is done, he sells them at
a very reasonable price.
-pete Both supplier and customer
On Wed, Aug 3, 2011 at 6:12 PM, paul swed paulsw...@gmail.com wrote:
I have to agree with John. Dave is reasonable and does a really excellent
job.
Well worth his
Hi John:
Very interesting. I wonder if it's something that can be observed in a
home system?
I've got some radioactive samples and various counters that detect their
particles as well a precision time equipment.
http://en.wikipedia.org/wiki/Radioactive_decay#Changing_decay_rates
Or returns them to the owner, as appropriate.
-John
I'll 3rd DAVE is the way to go. And when he is done, he sells them at
a very reasonable price.
-pete Both supplier and customer
On Wed, Aug 3, 2011 at 6:12 PM, paul swed paulsw...@gmail.com wrote:
I have to agree with
I think you'd want to detect as large a fraction of the events as
possible. IMO, putting the source between two disks of plastic
scintillator material in a shallow well and coupled together w/ clear
silicone grease might be a good way to go.
An alternate might be with the source in a hole in a
i was thinking send them all to Dave let him scan the ones he has not scanned.
Sure better then them ending up in a paper-recycle dropbox
-pete
On Wed, Aug 3, 2011 at 8:37 PM, J. Forster j...@quikus.com wrote:
Or returns them to the owner, as appropriate.
-John
I'll 3rd
I think a simple solution is anyone that gets a free manual has to scan it and
upload it to BAMA or some other free manual website.
It is unrealistic to expect one person to scan filing cabinets worth of
manuals, but to spread the task around makes sense.
-Original Message-
From:
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