Time Standard Dilemma

"Charles Edmondson" <edmondson@ieee.org> wrote in message
news:42532682$1@news.cadence.com...
I remember all the problmes trying to sync a computer complex to WWV a few
years ago, before GPS became readily available. It was a real pain
finding someplace in the building that had good signal, since the building
wall insulation all had a foil liner that cut the signal too much!
Click to expand...
Hmm... but the GPS signal made it through enough to work, eh?

Personally, for any radio signal one really cares about, I suggest putting
up outside antennas!
 
Jim Thompson wrote...
My wife talked me into buying a _beautiful_ Omega watch ($2400) that
is self-winding. It won't stay ticking for more than about 12 hours,
if you're not an arm waver.
Click to expand...
My dad bought one of those watches when I was a boy (they were a lot
cheaper then. It stayed wound fine, even though he wasn't a big arm
waving person, and ran well for years. Then he bought me one, which
I wore for several years. No problem. Yours may need service.


--
Thanks,
- Win
 
On Tue, 05 Apr 2005 09:16:44 -0700,
Jim Thompson <thegreatone@example.com> wrote
in Msg. <76e55159vc0ac6k3i0an35mjth257qi4lm@4ax.com>

My wife talked me into buying a _beautiful_ Omega watch ($2400) that
is self-winding. It won't stay ticking for more than about 12 hours,
if you're not an arm waver.
Click to expand...
I've got one of those -- a rather cheap and ugly one by Citizen, but I've
grown fond of it over the 20+ years I've been wearing it. Some ten years
ago it started losing accuracy; it's now losing a minute every couple of
days.

--Daniel
 
On 6 Apr 2005 09:27:09 GMT, the renowned Daniel Haude
<haude@kir.physnet.uni-hamburg.de> wrote:

On Tue, 05 Apr 2005 09:16:44 -0700,
Jim Thompson <thegreatone@example.com> wrote
in Msg. <76e55159vc0ac6k3i0an35mjth257qi4lm@4ax.com

My wife talked me into buying a _beautiful_ Omega watch ($2400) that
is self-winding. It won't stay ticking for more than about 12 hours,
if you're not an arm waver.

I've got one of those -- a rather cheap and ugly one by Citizen, but I've
grown fond of it over the 20+ years I've been wearing it. Some ten years
ago it started losing accuracy; it's now losing a minute every couple of
days.

--Daniel
Click to expand...
ISTR seeing "winders" for those watches that you put them into while
you sleep. I have a nice Breitling "Aerospace" digital/analog that
looks like an engineer's watch. ;-) But most of the time I wear a
cheap $75 Alessi or an even cheaper Timex or Casio that doesn't matter
if it gets broken or scratched (not that the sapphire crystal on high
end watches scratches that easily). Spend a bit of time in HK and
you'll start to think that $4K US just buys you a mid-range watch.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
In article <d2vcbd02hh9@drn.newsguy.com>,
Winfield Hill <hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:

Jim Thompson wrote...

My wife talked me into buying a _beautiful_ Omega watch ($2400) that
is self-winding. It won't stay ticking for more than about 12 hours,
if you're not an arm waver.

My dad bought one of those watches when I was a boy (they were a lot
cheaper then. It stayed wound fine, even though he wasn't a big arm
waving person, and ran well for years. Then he bought me one, which
I wore for several years. No problem. Yours may need service.
Click to expand...
I retired my Zodiac GMT Aerospace automatic watch last year. I bought it
in 1967 for $61.25 at the base exchange. Hopefully my new Citzen watch
will last as long.

Al
 
On 5 Apr 2005 18:00:29 -0700, Winfield Hill
<hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:

Jim Thompson wrote...

My wife talked me into buying a _beautiful_ Omega watch ($2400) that
is self-winding. It won't stay ticking for more than about 12 hours,
if you're not an arm waver.

My dad bought one of those watches when I was a boy (they were a lot
cheaper then. It stayed wound fine, even though he wasn't a big arm
waving person, and ran well for years. Then he bought me one, which
I wore for several years. No problem. Yours may need service.
Click to expand...
It just came back from "service". Maybe it's a dud :-(

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
In article <1112714082.044764.5410@l41g2000cwc.googlegroups.com>,
Tim Shoppa <shoppa@trailing-edge.com> wrote:
The GPS time reported from a real GPS will always be a
little late. The time is the time of the fix and the fix happened
at the edge of the 1PPS pulse. The actual message
data is sent after it is calculated and is
thus just a little late.

Probably irrelevant to this thread, but in fact most PPS-output GPS
timing receivers send the time string before the 1 PPS pulse.
Click to expand...
They send, make 1PPS, send, make 1PPS, send, make 1PPS etc. So they
in fact send the data both before and after the 1PPS pulse. I still
believe that the time and location are always old news before they are
sent. Time can be corrected so that it would not be but location can't
be.

I have done a real world test where the GPS, 1PPS and "we just passed the
marker" information was recorded for both directions of travel. The GPS
location, is certainly delayed in the data.



--
--
kensmith@rahul.net forging knowledge
 
On Wed, 06 Apr 2005 07:59:19 -0700, Jim Thompson wrote:

On 5 Apr 2005 18:00:29 -0700, Winfield Hill
hill_a@t_rowland-dotties-harvard-dot.s-edu> wrote:

Jim Thompson wrote...

My wife talked me into buying a _beautiful_ Omega watch ($2400) that is
self-winding. It won't stay ticking for more than about 12 hours, if
you're not an arm waver.

My dad bought one of those watches when I was a boy (they were a lot
cheaper then. It stayed wound fine, even though he wasn't a big arm
waving person, and ran well for years. Then he bought me one, which I
wore for several years. No problem. Yours may need service.

It just came back from "service". Maybe it's a dud :-(
Click to expand...
Jeezis!

Send me $2400.00, I'll wind your f**king watch for you, and look up the
time three different ways to make sure that you're precisely on
shedule[sic].

Thanks,
Rich
 
On Wed, 06 Apr 2005 07:14:34 -0400, Spehro Pefhany wrote:
On 6 Apr 2005 09:27:09 GMT, the renowned Daniel Haude
Jim Thompson <thegreatone@example.com> wrote in Msg.
My wife talked me into buying a _beautiful_ Omega watch ($2400) that is
self-winding. It won't stay ticking for more than about 12 hours, if
you're not an arm waver.
I've got one of those -- a rather cheap and ugly one by Citizen, but I've
grown fond of it over the 20+ years I've been wearing it. Some ten years
ago it started losing accuracy; it's now losing a minute every couple of
days.
ISTR seeing "winders" for those watches that you put them into while you
sleep. I have a nice Breitling "Aerospace" digital/analog that looks like
an engineer's watch. ;-) But most of the time I wear a cheap $75 Alessi
or an even cheaper Timex or Casio that doesn't matter if it gets broken or
scratched (not that the sapphire crystal on high end watches scratches
that easily). Spend a bit of time in HK and you'll start to think that $4K
US just buys you a mid-range watch.
Click to expand...
Heck, I've got you all beat - I've got two watches that I wear Simultaneously:
http://neodruid.net/images/DualWatch.jpg

The seconds aren't in sync, because, as I found out when I went to the
watch place to get a new battery, it's two complete, independent watches
in the one package, ergo, I had to buy TWO batteries! (and syncing up the
seconds is WAY more PITA than I need to subject myself to, merely to know
if it's day or night! It's close enough that I generally don't miss "Star
Trek". ;-) )

Cheers!
Rich
 
Al wrote:
In article <1153ev1cpkeuu99@corp.supernews.com>,
Guy Macon <_see.web.page_@_www.guymacon.com_> wrote:


Al wrote:


Check it against your GPS. I know my GPS agrees with the local radio
station "beeps" on the hour almost exactly.

At least two of my local radio stations are 15 seconds off at the
beep because they use a delay to seamlessly remove coughing.

Could you give us the brand and model of your "recently acquired
'atomic clock'"?



I just checked the clock and it has no brand name. Hmmm. It was made in
China and sold at Walgreens for about $10 US. Aside from the 15 sec. or
so discrepancy, it works just great. All it says on it is, "Atomic
Clock." And I have seen it synchronize.

Could this be a plot to screw with our minds ;-)

Al
Click to expand...
Ah, you must be one of those new-fangled digital-type guys who think
that real men need 8-digit alarm clocks... We analog geezers would just
rotate the second hand by 90 degrees.

Cheers,

Phil Hobbs
 
On Tue, 5 Apr 2005 19:34:32 +0100, douglas dwyer
<dd@ddwyer.demon.co.uk> wrote:

In message <76e55159vc0ac6k3i0an35mjth257qi4lm@4ax.com>, Jim Thompson
thegreatone@example.com> writes
My wife talked me into buying a _beautiful_ Omega watch ($2400) that is
self-winding. It won't stay ticking for more than about 12 hours, if
you're not an arm waver.
The first Quartz Watch (as far as I know) was the Omega Megaquartz still
possibly the most accurate unsynchronised) as it employed an AT cut with
its superior aging and tempco at a binary 2MHz (we did the crystal in
the UK)
Priced in the early 70s out of reach of the masses it was not a success.
Find one as a future investment if you can
Click to expand...
AT cut at around human body temperature is far from stable. The
turnover point is much higher. Despite that, thickness shear is still
a lot more stable than the beam bending at 32kHz.

d

Pearce Consulting
http://www.pearce.uk.com
 
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