Not so amazing , but one from Burger King would be.

"Ignoramus30509" wrote The result
is that the watch is not even by one second off!!!
Obviously, there are limits to my own precision in how I pressed the
return key right when the watch ticked :00, plus the OS delay in
starting "date", but in any case I could not detect any difference.

I find it rather amazing, really.

On Sun, 19 Mar 2006 22:16:10 GMT, "The Baron"
wrote:

Not so amazing , but one from Burger King would be.

interesting you should make that comment.
here in australia many years ago hungry jack's the australian burger
king clone gave away/sold watches for kids for a dollar.
they came in square and triangular shapes with either a clip back or a
wrist band.

a triangular one with a clip was attached by me to the airconditioned
window of our computer room. at a constant 20 degrees C it kept
perfect time for nearly 2 years. certainly far far better time than
our mainframe.

these little quartz circuits can be stunningly accurate.
Stealth Pilot

On Tue, 21 Mar 2006 20:15:39 +0800, the renowned Stealth Pilot
wrote:

On Sun, 19 Mar 2006 22:16:10 GMT, "The Baron"
wrote:

Not so amazing , but one from Burger King would be.

interesting you should make that comment.
here in australia many years ago hungry jack's the australian burger
king clone gave away/sold watches for kids for a dollar.
they came in square and triangular shapes with either a clip back or a
wrist band.

a triangular one with a clip was attached by me to the airconditioned
window of our computer room. at a constant 20 degrees C it kept
perfect time for nearly 2 years. certainly far far better time than
our mainframe.

these little quartz circuits can be stunningly accurate.
Stealth Pilot

Here's the data sheet for a typical tuning-fork style watch crystal:
http://www.ecsxtal.com/pdf/ecs-3x8.pdf

Initial tolerance +/-20ppm, typically changing only about -5ppm for a
+/-10°C change (centered around 25°C).

20 parts per million is 20/10^6 * 365.25 * 24 * 60 = 10 minutes per
year.



Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com

My experience is that they might run for a week.

"Stealth Pilot" wrote in message
...
On Sun, 19 Mar 2006 22:16:10 GMT, "The Baron"
wrote:

Not so amazing , but one from Burger King would be.

interesting you should make that comment.
here in australia many years ago hungry jack's the australian burger
king clone gave away/sold watches for kids for a dollar.
they came in square and triangular shapes with either a clip back or a
wrist band.

a triangular one with a clip was attached by me to the airconditioned
window of our computer room. at a constant 20 degrees C it kept
perfect time for nearly 2 years. certainly far far better time than
our mainframe.

these little quartz circuits can be stunningly accurate.
Stealth Pilot

According to The Baron :

"Stealth Pilot" wrote in message
...

interesting you should make that comment.
here in australia many years ago hungry jack's the australian burger
king clone gave away/sold watches for kids for a dollar.

[ ... ]

a triangular one with a clip was attached by me to the airconditioned
window of our computer room. at a constant 20 degrees C it kept
perfect time for nearly 2 years. certainly far far better time than
our mainframe.

these little quartz circuits can be stunningly accurate.
Stealth Pilot

My experience is that they might run for a week.

The difference might be the environment. Ones on the wrists of
little kids would lead a hard life. One stuck to the window of a
constant temperature computer room was living a charmed life by
comparison.

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

However - that is the basic xtal. Now for the stabilized one. Temp control.
Proper cut. Post filter and amplifier circuit. Yep - was in the business
of getting Silicon Xtals and various frequencies possible into production at
a semi house.

Not just a simple xtal one plugs into a CB!

Martin

Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH & Endowment Member
NRA Second Amendment Task Force Charter Founder



Spehro Pefhany wrote:
On Tue, 21 Mar 2006 20:15:39 +0800, the renowned Stealth Pilot
wrote:


On Sun, 19 Mar 2006 22:16:10 GMT, "The Baron"
wrote:


Not so amazing , but one from Burger King would be.


interesting you should make that comment.
here in australia many years ago hungry jack's the australian burger
king clone gave away/sold watches for kids for a dollar.
they came in square and triangular shapes with either a clip back or a
wrist band.

a triangular one with a clip was attached by me to the airconditioned
window of our computer room. at a constant 20 degrees C it kept
perfect time for nearly 2 years. certainly far far better time than
our mainframe.

these little quartz circuits can be stunningly accurate.
Stealth Pilot


Here's the data sheet for a typical tuning-fork style watch crystal:
http://www.ecsxtal.com/pdf/ecs-3x8.pdf

Initial tolerance +/-20ppm, typically changing only about -5ppm for a
+/-10°C change (centered around 25°C).

20 parts per million is 20/10^6 * 365.25 * 24 * 60 = 10 minutes per
year.



Best regards,
Spehro Pefhany

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According to Martin H. Eastburn :
However - that is the basic xtal. Now for the stabilized one. Temp control.
Proper cut. Post filter and amplifier circuit. Yep - was in the business
of getting Silicon Xtals and various frequencies possible into production at
a semi house.

Not just a simple xtal one plugs into a CB!

Weren't the ones for watches cut in a tuning fork shape, so you
could get a very low frequency in a very small package?

Enjoy,
DoN.

--
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

On Tue, 21 Mar 2006 07:39:50 -0500, Spehro Pefhany wrote:

Here's the data sheet for a typical tuning-fork style watch crystal:
http://www.ecsxtal.com/pdf/ecs-3x8.pdf

Initial tolerance +/-20ppm, typically changing only about -5ppm for a
+/-10°C change (centered around 25°C).


If you carry it around on your wrist most of the time (I have a leather
band and I only take it off for showers/pools/etc), the temperature
is stable to within 1°C or so: 0.5 ppm is approx. 1 sec / month.
I actually see something like that on my $35 Timex.

Some used mechanical filtering by that method - not only electric stimulated but
mechanical feedback to maintain. Laser cut (trim) as needed.

Martin
Martin Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
NRA LOH & Endowment Member
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member


DoN. Nichols wrote:
According to Martin H. Eastburn :

However - that is the basic xtal. Now for the stabilized one. Temp control.
Proper cut. Post filter and amplifier circuit. Yep - was in the business
of getting Silicon Xtals and various frequencies possible into production at
a semi house.

Not just a simple xtal one plugs into a CB!


Weren't the ones for watches cut in a tuning fork shape, so you
could get a very low frequency in a very small package?

Enjoy,
DoN.


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