John Don,
Thanks for your thoughts and ideas. Limited availability of different
sizes and shapes of vacuum bottle is a problem, but I'll be keeping
your ideas in mind when I make my selection.
Ed
On 7/30/2011 6:29 PM, J. Forster wrote:
[snip]
That will give you a static
Maybe these guys have what you need:
http://www.popedewars.com/home.html
-John
==
John Don,
Thanks for your thoughts and ideas. Limited availability of different
sizes and shapes of vacuum bottle is a problem, but I'll be keeping
your ideas in mind when I make my
I did find Pope's site earlier after looking for Dewar flasks on eBay.
They don't have one that's close enough in size to be worth the cost
premium over a standard Thermos bottle. Same with a Google search for
other Dewar suppliers.
The original Dewar had internal dimensions of
Hello time-nuts,
I've been on this list for several years now and I've made a few little
comments on occasion, but this will be my first real technical post.
I desire to build a timekeeping apparatus which I have nicknamed the
rubber duckie, or a Rubber Time Generator. As I've voiced very
You left out the most important requirements.
1) How acurate does this all need to be? Is 1/10 of a second good
enough or is this all to run at the handful of nano seconds level?
2) How is the time to be output or displayed? Are we driving an
analog clock with sweep second hand or a time code
I did find Pope's site earlier after looking for Dewar flasks on eBay.
They don't have one that's close enough in size to be worth the cost
premium over a standard Thermos bottle. Same with a Google search for
other Dewar suppliers.
The original Dewar had internal dimensions
No, I didn't email OSA. I always assume that if it's available, it'll
be out of my price range. For example, I asked Symmetricom if it was
possible to upgrade the software in an X72 Rubidium to a newer
version. All it consisted of was reflashing. They said it could be
done for
Hi
Without knowing the full objective it's always hard to offer up suggestions.
I'm going to *assume* that you want a PPS that is good to 1 ms on your custom
time scale. I'm also assuming that sidereal time is a reasonable analog to what
you are trying to do. I think your approach is overly
Michael,
GPS provides leapsecond information, BUT, to my knowledge, does not implement
it. The GPS time reported by GPS is the invariant time of the Cesium references
that are used to steer the BIRDS.
That said, any software that displays UTC would have to take the GPS time and
add
or subtract
The below could work but even it is overly complex. Try this..
1) Get any computer and install NTP. Use any decent timing GPS as a
reference.Now you have a computer with system time accurate to UTC
and the sub millisecond level. This is a 100% conventional setup, no
rocket science.
2)
Hi
or drop the GPS and just run NTP. Simpler still run SNTP on something
small. You won't hit 1ms in either case. You will be plenty good by wall clock
standards.
Bob
On Aug 1, 2011, at 6:27 PM, Chris Albertson albertson.ch...@gmail.com wrote:
The below could work but even it is
Hi Ed,
I once got a 8600 with the devar broken in shippment due to inadequate
packaging. It is now working fine in a friends time-lab.
http://www.febo.com/pipermail/time-nuts/2007-October/027832.html
Btw, look here for an example of Greg Dowd from Symmetricom helping out
right here on
I think that a Thunderbolt GPSDO with Lady Heather should be able to do what
you want. It can be set up for GPS time (no leapseconds) or UTC time. It can
handle time zone offsets to the second for fine tuning your whacko time scales.
It can display the date in JD, MJD, ISO, and a bunch of
Chris Albertson albertson.ch...@gmail.com wrote:
In engineering something like this it is very impotent NOT to mix up
primary requirements, derived requirements, implementation
details.
primary requirements describe the thing you want, NOT how it works.
Derived ones are the logical fallout
On Mon, Aug 1, 2011 at 6:18 PM, Michael Sokolov
msoko...@ivan.harhan.org wrote:
At the present moment I can satisfy my requirement simply by looking at
a WWVB-synced wristwatch: WWVB transmits UTC, and
OK this defines your require accuracy very well. ideally are required
to be without 1/2
Another possible solution is to use a Rubidium stabilised oscillator
like a LPRO which has been set to your preferred frequency.
If my aged brain remembers my calculation correctly, it is spec'd to
be accurate to one second in 30 years,
so you might have to correct your clock every decade or
The parameters you'll want for conversion between MCAT and mean solar
time are given daily in the IERS bulletins:
http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletins.html
By making use of these you should be able to do much better than the
slightly inelegant leap second
Chris Albertson albertson.ch...@gmail.com wrote:
I think you can do just fine without GPS and GPSDXO oscillators and
the like. NTP over the Internet is an order of magnitude better then
you need.
No, I really don't want anything NTP-based. Or let's put it another
way: part of my objective
Henry Hallam he...@pericynthion.org wrote:
The parameters you'll want for conversion between MCAT and mean solar
time are given daily in the IERS bulletins:
http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletins.html
Yes, I know.
By making use of these you should be able to do much
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