Most accurate clock on your wrist
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
hi jim, here's the thing you were asking for:
http://home.xnet.com/~cmaddox/omega_megaquartz_2400.html
as for myself - i do rely on a seiko 7548 reference quartz watch with
a 'drift' of +/- 15 sec. per month.
noz bad for a unit used for boiling eggs on a sunday morning ;-)
best regards, sebastian
Am 17.04.2007 um 01:11 schrieb Palfreyman, Jim L:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully
self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Palfreyman, Jim L wrote:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
Jim,
My Nixie tube wristwatch is pretty darn accurate for a wristwatch - it
can be adjusted to about one second per week accuracy. It has a trimmer
capacitor for fine tuning. I use an HP 5245L counter in period-average
mode to do the adjusting.
Its microcontroller chip is programmed with open-source code, so you can
mess with the programming if you like.
--David Forbes
There is one on eBay right now, item# 130101409636.
Peter Lacey
AA1ZU
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Sebastian Stolp
Sent: Monday, April 16, 2007 7:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Most accurate clock on your wrist
hi jim, here's the thing you were asking for:
http://home.xnet.com/~cmaddox/omega_megaquartz_2400.html
as for myself - i do rely on a seiko 7548 reference quartz watch with
a 'drift' of +/- 15 sec. per month.
noz bad for a unit used for boiling eggs on a sunday morning ;-)
best regards, sebastian
Am 17.04.2007 um 01:11 schrieb Palfreyman, Jim L:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully
self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Jim;
I would suggest that the most accurate self contained wrist watch you
can get is the Synchronar 2100 Mk IV, after you've adjusted it.
It uses a fairly high frequency crystal (~700 kHz or so as I recall),
and a digital divider you can set externally, in increments of 8
seconds per year.
I got mine in the late 1980's, and have happily tweaked it yearly since
then.
From New Years Eve 2000 to NYE 2001, mine held within 3 seconds. Of
course, to be fair, it WAS sitting on a shelf in a temperature
controlled room the whole time.
It's pretty consistently within 16 seconds every year, leaving me with
the quandary of whether to adjust or not...
Of course, now that they changed when DST happens (the date isn't
changeable, you either compensate automatically for it or not), I have
to manually reset the damn thing anyway...
Tom Frank
On Apr 16, 2007, at 7:11 PM, Palfreyman, Jim L wrote:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully
self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Hey y'all,
Interesting site but he's kinda behind the times, so to speak :-)
about what modern, more pedestrian watches can do.
Back around Christmas I bought a Luminox dive chronometer, model
3HMBM. This is the one with the chrono functions in the form of a
little LCD screen under 12 o'clock. I got this one for two reasons.
First and foremost, it has tritium-illuminated hands and dial. Second,
it's waterproof which means it's also mostly "me-proof"....
The analog and digital sections are separate and get set separately,
strangely enough. Even more strangely, the analog part keeps better
time.
When I got the watch I spent a bit of time getting it exactly synced
with the NTP-controlled system clock on my computer. I observed it
for deviation daily for awhile but it became evident that this
frequency wasn't necessary. This is an amazingly accurate watch. I
just checked it and it's almost 4 second fast. That works out to
about a second a month.
This is by far the most accurate watch I own, including my WWVB synced
watches. I have two, a G-shock and a combo analog/digital chrono
similar to the Luminox. Both drift worse than a second a day if they
don't receive a signal.
I don't know if there is anything out there any better than the
Luminox but I kinda doubt it. A second a month is superb performance
for a wristwatch.
John
On Tue, 17 Apr 2007 01:20:12 +0200, Sebastian Stolp
sebastianstolp@gmx.net wrote:
hi jim, here's the thing you were asking for:
http://home.xnet.com/~cmaddox/omega_megaquartz_2400.html
as for myself - i do rely on a seiko 7548 reference quartz watch with
a 'drift' of +/- 15 sec. per month.
noz bad for a unit used for boiling eggs on a sunday morning ;-)
best regards, sebastian
Am 17.04.2007 um 01:11 schrieb Palfreyman, Jim L:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully
self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
Hi,
Modern temperature compensated quartz movements are typically specified at +_ 10 seconds per year. An example is the Breitling Professional Aerospace I wear daily. Not excessively expensive (£1500) and not so obvious to muggers etc as a Rolex.
The best current spec is "The Citizen" with an A660 movement at +- 5s/year but that's if you wear it at least 12h a day.
See http://forums.timezone.com/index.php?goto=1910741&rid=0&t=tree for some more info.
Robert.
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Neon John
Sent: 17 April 2007 07:59
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Most accurate clock on your wrist
Hey y'all,
Interesting site but he's kinda behind the times, so to speak :-)
about what modern, more pedestrian watches can do.
Back around Christmas I bought a Luminox dive chronometer, model
3HMBM. This is the one with the chrono functions in the form of a
little LCD screen under 12 o'clock. I got this one for two reasons.
First and foremost, it has tritium-illuminated hands and dial. Second,
it's waterproof which means it's also mostly "me-proof"....
The analog and digital sections are separate and get set separately,
strangely enough. Even more strangely, the analog part keeps better
time.
When I got the watch I spent a bit of time getting it exactly synced
with the NTP-controlled system clock on my computer. I observed it
for deviation daily for awhile but it became evident that this
frequency wasn't necessary. This is an amazingly accurate watch. I
just checked it and it's almost 4 second fast. That works out to
about a second a month.
This is by far the most accurate watch I own, including my WWVB synced
watches. I have two, a G-shock and a combo analog/digital chrono
similar to the Luminox. Both drift worse than a second a day if they
don't receive a signal.
I don't know if there is anything out there any better than the
Luminox but I kinda doubt it. A second a month is superb performance
for a wristwatch.
John
On Tue, 17 Apr 2007 01:20:12 +0200, Sebastian Stolp
sebastianstolp@gmx.net wrote:
hi jim, here's the thing you were asking for:
http://home.xnet.com/~cmaddox/omega_megaquartz_2400.html
as for myself - i do rely on a seiko 7548 reference quartz watch with
a 'drift' of +/- 15 sec. per month.
noz bad for a unit used for boiling eggs on a sunday morning ;-)
best regards, sebastian
Am 17.04.2007 um 01:11 schrieb Palfreyman, Jim L:
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully
self
controlled units.
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Oh and yes I want one!
Jim Palfreyman
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
time-nuts mailing list
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Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600.
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Jim Palfreyman wrote:
Also, on the NIST website they talk about a new development - the atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Development continues - they are trying to reduce the power
consumption by an order of magnitude to about 30mW so it can work in
battery-powered equipment.
Oh and yes I want one!
Join the queue!
One problem with "atomic" timecode receiving clocks is the availability
of a usable signal. Most only receive the signal for the geographic area
where they were sold. Interference (SMPSU's etc) is also a problem.
Thus my vote goes to the sub $100 Garmin Forerunner 101.
https://buy.garmin.com/shop/shop.do?cID=142&pID=231
Yes it's a GPS referenced wrist watch! They sell it as a training
(running aid) but it has a nice big time display. In terms of long time
accuracy, the availability of a time up-date any where in the world and
price it's got to be the winner. It's not much of a fashion statement
though!
Robert.
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Peter Vince
Sent: 17 April 2007 11:30
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Most accurate clock on your wrist
Jim Palfreyman wrote:
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Development continues - they are trying to reduce the power
consumption by an order of magnitude to about 30mW so it can work in
battery-powered equipment.
Oh and yes I want one!
Join the queue!
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN Registered in England No. 2660050 www.genetix.com
Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600.
The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party.
I've been waiting with baited breath for a GPS watch. NOT a NAVAID on
the wrist but a simple GPS-synced watch. It would seem to me that
making a miniature GPS receiver would be much easier than making a
WWVB receiver.
Unfortunately that watch ain't it. Gad, they need a good industrial
designer!
Maybe they'll put the same electronics in a table/travel clock. If it
had a 1PPS connector on the back, so much the better :-)
John
On Thu, 19 Apr 2007 15:09:46 +0100, "Robert Atkinson"
robert.atkinson@genetix.com wrote:
One problem with "atomic" timecode receiving clocks is the availability
of a usable signal. Most only receive the signal for the geographic area
where they were sold. Interference (SMPSU's etc) is also a problem.
Thus my vote goes to the sub $100 Garmin Forerunner 101.
https://buy.garmin.com/shop/shop.do?cID=142&pID=231
Yes it's a GPS referenced wrist watch! They sell it as a training
(running aid) but it has a nice big time display. In terms of long time
accuracy, the availability of a time up-date any where in the world and
price it's got to be the winner. It's not much of a fashion statement
though!
Robert.
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Peter Vince
Sent: 17 April 2007 11:30
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Most accurate clock on your wrist
Jim Palfreyman wrote:
Also, on the NIST website they talk about a new development - the
atomic
clock the size of a grain of rice. I see this as having huge future
potential. Does anyone have any news on this development?
Development continues - they are trying to reduce the power
consumption by an order of magnitude to about 30mW so it can work in
battery-powered equipment.
Oh and yes I want one!
Join the queue!
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Genetix Limited - Queensway, New Milton, Hampshire, BH25 5NN Registered in England No. 2660050 www.genetix.com
Any opinions expressed in this email are those of the individual and not necessarily Genetix Ltd (Genetix) or any company associated with it. This email and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this email in error and that any use is strictly prohibited. If you have received this email in error please notify Genetix by telephone on +44 (0)1425 624600.
The unauthorised use, disclosure, copying or alteration of this message is strictly forbidden. This mail and any attachments have been scanned for viruses prior to leaving Genetix network. Genetix will not be liable for direct, special, indirect or consequential damages as a result of any virus being passed on, or arising from alteration of the contents of this message by a third party.
time-nuts mailing list
time-nuts@febo.com
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John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
I've been waiting with baited breath for a GPS watch. NOT a NAVAID on
the wrist but a simple GPS-synced watch. It would seem to me that
making a miniature GPS receiver would be much easier than making a
WWVB receiver.
Unfortunately that watch ain't it. Gad, they need a good industrial
designer!
Maybe they'll put the same electronics in a table/travel clock. If it
had a 1PPS connector on the back, so much the better :-)
John
Have you looked at the various Casio GPS watches?
/tvb
Neon John wrote:
I've been waiting with baited breath for a GPS watch. NOT a NAVAID on
the wrist but a simple GPS-synced watch. It would seem to me that
making a miniature GPS receiver would be much easier than making a
WWVB receiver.
Unfortunately that watch ain't it. Gad, they need a good industrial
designer!
Maybe they'll put the same electronics in a table/travel clock. If it
had a 1PPS connector on the back, so much the better :-)
John
The Casio watch is rechargeable, since the GPS function drains the
battery in two hours. Amusingly, it takes three hours to charge it, so
the GPS drain current is higher than the charger's output!
Recharging a wristwatch is not my idea of a good time. It needs to be
very easy to do. A USB-powered charger may be ideal.
I expect a practical GPS wrist-mounted timepiece would use the GPS only
every couple of days to resync, giving time accurate to perhaps a few
tenths of a second. You could always request a resync if you needed to
know precisely what time it was.
On Thu, 19 Apr 2007 09:53:42 -0700, "Tom Van Baak"
tvb@LeapSecond.com wrote:
I've been waiting with baited breath for a GPS watch. NOT a NAVAID on
the wrist but a simple GPS-synced watch. It would seem to me that
making a miniature GPS receiver would be much easier than making a
WWVB receiver.
Unfortunately that watch ain't it. Gad, they need a good industrial
designer!
Maybe they'll put the same electronics in a table/travel clock. If it
had a 1PPS connector on the back, so much the better :-)
John
Have you looked at the various Casio GPS watches?
Too big and ugly. I don't want to look like a poseur SEAL or marathon
runner :-) This Luminox I wear now is about as far as I want to go
down that road and even then I had to wait for 'em to offer one
without the "Navy SEALS" moniker on the face.
My absolute perfect watch would be one merging a Casio, tritium
backlight and GPS receiver. The Casio I'm referring to has an analog
dial with the LCD display as part of the crystal. You look through
the LCD to see the dial. Put tritium vials on the analog part and add
a GPS timing receiver and perfection.
The watch that I liked most of any I've ever had is the old Sensor,
sold by JS&A wholesale back in the 70s. One of the very first LCD
watches, it has a flat tritium capsule under the display. Bright
enough back then to use as a flashlight for finding keyholes and the
like. I still have it but the tritium has decayed so that the glow is
just barely perceptible with night-adjusted eyes.
I worked at TVA's Sequoyah Nuclear Plant back then. Several of us in
the office bought Sensors at the same time. Naturally a contest
developed to see who could produce the most accurate watch. The
sensor had a trimmer cap under the back which was good to a few
seconds a month. After that temperature compensation was required. I
made surface mount NPO caps before there were surface mount components
by removing the outer coating from a disc cap, nipping off little
chunks and soldering them to the tiny PCB.
We all achieved better than a few seconds a year so no one was ever
named the winner. That's probably where my time-nuttiness got started
:-)
John
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
On Thu, 19 Apr 2007 10:58:06 -0700, David Forbes
dforbes@dakotacom.net wrote:
The Casio watch is rechargeable, since the GPS function drains the
battery in two hours. Amusingly, it takes three hours to charge it, so
the GPS drain current is higher than the charger's output!
Recharging a wristwatch is not my idea of a good time. It needs to be
very easy to do. A USB-powered charger may be ideal.
Mine neither. Maybe someone will use inductive charging or solar
power like my G-shock WWVB watch. That one just has solar cell around
the edges since it's opaque brown. I read somewhere of the
development of an organic solar material that is semi-transparent.
Perhaps they could coat the whole crystal with the stuff.
I expect a practical GPS wrist-mounted timepiece would use the GPS only
every couple of days to resync, giving time accurate to perhaps a few
tenths of a second. You could always request a resync if you needed to
know precisely what time it was.
Yep, much more reasonable.
John
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
All great things are simple and many can be expressed in single words:
Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill
Hi Folks,
What is the most accurate wrist watch you can purchase? Obviously the
radio controlled ones are the best, but I'm curious as to the fully self
controlled units.
Actually, the RC watches may or may not be the best, depending
on what measurement you use. Here are accuracy plots of a nice
RC watch. Decide for yourself:
http://www.leapsecond.com/pages/Junghans/Junghans-1d.gif
http://www.leapsecond.com/pages/Junghans/Junghans-10d.gif
http://www.leapsecond.com/pages/Junghans/Junghans-WWVB.jpg
Oh and yes I have seen the photo of the caesium clock attached to
someone's wrist!
It should come as no surprise to you that these URL's come
from the same person...
http://www.leapsecond.com/pages/atomic-bill/
http://www.leapsecond.com/time-nuts.htm
http://www.leapsecond.com/pages/atomic-tom/
/tvb