Bruce
Good, It does seem like we are finally making some good progress.
You now seem to acknowledge that my tester could work if I integrate.
You now seem to acknowledge that I am integrating by using a filter.
I acknowledge that my integration method is not perfect, BUT it is simple
and good
Has anyone utilized a network of locally, weakly coupled
oscillator synchronization (a la
http://www.projectcomputing.com/resources/sync/index.html )
for precise timekeeping purposes?
--
Eugen* Leitl a href=http://leitl.org;leitl/a http://leitl.org
WarrenS wrote:
Bruce
Good, It does seem like we are finally making some good progress.
You now seem to acknowledge that my tester could work if I integrate.
You now seem to acknowledge that I am integrating by using a filter.
In a sampled data system integration is equivalent to a filter but
Sounds like someone is grandstanding to me!
Steve
On 12 May 2010 22:26, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
WarrenS wrote:
Bruce
Good, It does seem like we are finally making some good progress.
You now seem to acknowledge that my tester could work if I integrate.
You now
Hi
The tendency of clocks to self synchronize dates back at least to the days of
pendulum clocks. It may date to the era of water clocks, but if so it's
undocumented. It has been observed on a wide range of modern clock designs. If
you look into injection locking you'll get a pretty good
Eugen Leitl wrote:
Has anyone utilized a network of locally, weakly coupled
oscillator synchronization (a la
http://www.projectcomputing.com/resources/sync/index.html )
for precise timekeeping purposes?
There was a discussion on this list about doing something like filling a
cavern with
On Wed, May 12, 2010 at 06:03:11AM -0700, jimlux wrote:
Eugen Leitl wrote:
Has anyone utilized a network of locally, weakly coupled
oscillator synchronization (a la
http://www.projectcomputing.com/resources/sync/index.html )
for precise timekeeping purposes?
There was a discussion on this
Bob Camp wrote:
Hi
The tendency of clocks to self synchronize dates back at least to the
days of pendulum clocks. It may date to the era of water clocks, but
if so it's undocumented. It has been observed on a wide range of
modern clock designs. If you look into injection locking you'll get
a
Eugen Leitl wrote:
On Wed, May 12, 2010 at 06:03:11AM -0700, jimlux wrote:
Allan had a paper where he had 8 inexpensive crystals coupled with
mixers and a microcontroller. I think it's called the Clever
Temperature Compensated XO or something like that.
Presumably, a large population of
Hi
My *guess* would be that you would need to setup a situation that favored
the lock. Simple outflow clocks probably aren't going to lock. Any of the
escarpment designs have the potential to lock.
Past that, sounds like a good reason to build up some on a flimsy shelf and
see what happens.
Hi
If the oscillators all lock to each other, then multiple oscillators don't
have any particular advantage.
Let's assume you can isolate them so they don't lock to each other. If they
are all of similar construction in a similar environment, there is a very
real limit to the advantage you
On 05/06/2010 12:29 PM, Arthur Dent wrote:
But now here is the finding. The monitor board has the 7805 SMD version and
I was feeding from +12Volt and after a while the SMD voltage regulator
overheated
and started to drop the voltage and it was the reason to receive/display
garbled
Hi Leigh:
Is the wiring to the monitor exposed such that you can touch it? I
think mine died because of static zap to the exposed wiring.
http://www.prc68.com/I/ThunderBolt.shtml#iCruze
Have Fun,
Brooke Clarke
http://www.PRC68.com
Leigh L. Klotz, Jr WA5ZNU wrote:
On 05/06/2010 12:29 PM,
My fluke.l monitor stopped working today ...
Mine stopped yesterday
The monitor is a recent model and has the regulator.
So does mine and I run the board from a 9V regulator.
The display is built into the same box as the gpsdo
I left it on overnight,
Mine has been on continuously for
In a message dated 12/05/2010 17:45:16 GMT Daylight Time, le...@wa5znu.org
writes:
The monitor is a recent model and has the regulator. I left it on
overnight, in its original case and out in the open, hooked to a 13.5V
supply. I had it on a ammeter the whole time, and it never draws
Must be the Y2.01K bug...
Sorry about the problems being reported recently.
While I have no association with Bob of Fluke.l, he is using my design and he
was kind enough to send me one demo model, which I have yet to turn on.
In general, if the processor is not fried, there is very little that
Hi
If the oscillators all lock to each other, then multiple oscillators don't
have any particular advantage.
Let's assume you can isolate them so they don't lock to each other. If they
are all of similar construction in a similar environment, there is a very
real limit to the advantage you
Who is headed to Dayton??
Any vendors with junk?
cu there! 73 de Norm n3ykf
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and follow the instructions there.
Presumably, a large population of cheap coupled oscillators could be rather
accurate collectively.
Why?
There are 2 main sources of error in inexpensive crystal oscillators.
The first is the initial manufacturing error. I'd expect crystals made from
the same batch to have similar errors.
Stop by the TAPR booth! I'll be there most of the time (when I'm not
out snooping around in the flea market).
John
normn3...@stny.rr.com said the following on 05/12/2010 06:08 PM:
Who is headed to Dayton??
Any vendors with junk?
cu there! 73 de Norm n3ykf
Well I guess no because accuracy is the deviation from a known standard (I
think) Stability repeatability might be better but you need to consider what
the variables might be. Variations in thickness (basically frequency), cut
angle (temp coeficient and maybe others), crystal purity (aging, ESR
On 5/12/2010 10:41 AM, Jim Lux wrote:
It never occurred to me that they might couple, although almost every
other mechanical clock does.
What would the mechanism be?
Perhaps if all of them run off the same reservoir
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time-nuts mailing
Is it possible that mechanical (pendulum) clocks could couple not due to
energy transfer between the clocks but external mechanical events such as
seismic events of a very low level ?? or even gravitational or lunar
gravitational effects.?? Maybe the same for water clocks ??
Alan G3NYK
-
That would not explain the lessing of the effect as the clocks are moved
father from each other or arranged as sides of a triangle. Maybe gravity
between the pendulums or more likely vibrations.
http://www.scholarpedia.org/article/Synchronization
http://www.siam.org/pdf/news/481.pdf
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