Folks,
I've made a small Web page describing what happened when I changed the
puck antenna on a Rapco 1804M for a more sensitive one. The Rapco 1804M
expects a big outside antenna.
http://www.satsignal.eu/ntp/Rapco-1804M-notes.html
Simply, the better signal provided a more consistent
On 10/29/2011 08:19 PM, Attila Kinali wrote:
Moin,
Over the past years, i've read quite a bit on the different flavours
of atomic clocks and how they are build. I found explenations for
most questions i had, but for one thing: Why do all current designs
(with the exception of trapped ion
On 10/29/2011 09:12 PM, Poul-Henning Kamp wrote:
In message20111029201927.b7a1130c.att...@kinali.ch, Attila Kinali writes:
Is it because they can be aproximated as single electron
systems due to the one electron in the valence orbit?
Yes. Basically that electron is in a figure of eight
On 10/29/2011 09:34 PM, paul swed wrote:
Ammonia was the first clock wasn't it?
Potentially Na and K have reactive behaviors like catching on fire that
isn't attractive to a manufacturing process.
A feature shared with H, Ru and Cs, which does not exclude them from
being selected.
Cheers,
On 10/29/2011 09:55 PM, J. Forster wrote:
Ammonia was the first clock wasn't it?
I think it was an amplifier, not an oscillator. Microwave Amplification by
Stimulated Emission of Radiation = MASER.
The ammonia clocks was not operating in amplification mode, but in
absorbtion mode similar to
On Sat, Oct 29, 2011 at 6:08 PM, paul swed paulsw...@gmail.com wrote:
Right but they have that ability and its not good enough.
The alternative was to
It may very likely be good enough. Lots of people think they got it
right. They either have a 60nS timing error which would be huge even
for
On Mon, Oct 24, 2011 at 8:39 PM, WarrenS warrensjmail-...@yahoo.com wrote:
I have a more basic time-nut question. Why is it a problem at all?
How can the time uncertainty between two known and fixed locations be that
large?
Hi, sorry I am not checking my non-CERN account very often these
Hi
Oddly enough, reactivity / cell lifetime is indeed worse with both ammonia and
mercury(!) than with Rb and Cs. At least that's the word from those who have
tried them all….
Bob
On Oct 30, 2011, at 11:51 AM, Magnus Danielson wrote:
On 10/29/2011 09:34 PM, paul swed wrote:
Ammonia was
Le 30/10/2011 20:21, Javier Serrano a écrit :
This can be done without
much regard to high precision. Some 100 ns are OK. If neutrino
time-of-flight had been the original goal of these experiments, quite
a number of things would have been done differently from the start.
I read that the OPERA
Nuts,
I recently picked up a C-Max evaluation kit from SparkFun to see if this
$10 board could be used as a precision timing source. The short answer is
no. The long answer is available at:
http://www.fuzzythinking.com/?page_id=29 .
It was a fun experiment and a great excuse to play with test
Hi JP:
Have you tried this at midnight local time?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/
Justin Pinnix wrote:
Nuts,
I recently picked up a C-Max evaluation kit from SparkFun to see if this
$10 board could be used as a precision timing source. The
Justin,
A while back, I did some crude experiments with the C-Max CME6005 IC which is,
I believe, used in that evaluation module. If memory serves, there were some
rather severe restrictions documented in either the datasheet or an application
note regarding the loading on the TCO/TCON pins.
You can use WWVB for timing but it is not as easy as buying the kit.
First you need a better antenna and then a good location for it that
is away from noisy electronics.then you have to let it disincline
a local clock for a while. It will not be as good as GPS and you may
never get 24 hour
Hi Brent,
I actually saw that warning partway through the experiment. I disconnected
it and didn't get any measurable difference. So, I put it back - it makes
it easier to see what's going on :-)
Based on several suggestions here, I think the next thing I'll try is
capturing actual event
Based on several suggestions here, I think the next thing I'll try is
capturing actual event arrival times. That will allow me to plot a
histogram and let the experiment run all night (and day) to take advantage
of different local times. Plus it gives me an excuse to buy (or build) a
Nuts,
I recently picked up a C-Max evaluation kit from SparkFun to see if this
$10 board could be used as a precision timing source. The short answer
is
no. The long answer is available at:
http://www.fuzzythinking.com/?page_id=29 .
It was a fun experiment and a great excuse to play with
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