On Thu, Mar 29, 2012 at 08:43, Hal Murray hmur...@megapathdsl.net wrote:
I think of GPS as a bunch of satellites broadcasting I'm Bob, my orbit
parameters are XXX, my clock says YYY. If you hear 4 of those, you have 4
equations to work out 4 unknowns. The unknowns are your position: X, Y,
I'm currently have to convince management that our 6-1/2 DMM (0.01%
uncertainty) can't be used to test the 0.1ppm DC Source that we're repairing.
Don't bother, just send it to me (once you've fixed it natch) :)
On a more serious note what it this DC source that can manage 0.1ppm - the only
Yes, and moreover: what kind of test can be done on that DC source if no
DMM is able to show that accuracy?
On Thu, Mar 29, 2012 at 9:53 AM, David C. Partridge
david.partri...@perdrix.co.uk wrote:
I'm currently have to convince management that our 6-1/2 DMM (0.01%
uncertainty) can't be used
by a professional hand model in
the Leapsecond site.
Thomas Knox
Date: Thu, 29 Mar 2012 21:20:14 +0200
From: att...@kinali.ch
To: n1...@alum.dartmouth.org; time-nuts@febo.com
Subject: Re: [time-nuts] Best reason
On Wed, 28 Mar 2012 13:42:39 -0400
David McGaw n1...@alum.dartmouth.org wrote
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
Personally I explain that accurate clocks enable you to pack a higher data
rate into your smart phone. They like that.
Any other thoughts?
Jim
On Wed, 28 Mar 2012 19:28:20 +1100
Jim Palfreyman jim77...@gmail.com wrote:
Why do we need really accurate clocks?
Accurate clocks are expensive. The more money the US war machine
spends for accurate clocks, the less money they have to build weapons.
Attila Kinali
--
In message calh-g5ygw4etqguifmo5czv1pxp3vhdhoyz9em6oa9_mvb4...@mail.gmail.com
, Jim Palfreyman writes:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
Because accurate clocks is the central technology that makes
GPS, mobile phones and the
Why do we need really accurate clocks?
Time or frequency?
p...@phk.freebsd.dk said:
Because accurate clocks is the central technology that makes GPS, mobile
phones and the internet work.
What part of the internet depends upon accurate clocks?
Ethernet, for example, requires roughly similar
On 3/28/12 1:28 AM, Jim Palfreyman wrote:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
Personally I explain that accurate clocks enable you to pack a higher data
rate into your smart phone. They like that.
But I don't know that
Usually (and unfortunately) governments tend to gather more money from tax
rather than giving up something (Italy docet).
On Wed, Mar 28, 2012 at 11:39 AM, Attila Kinali att...@kinali.ch wrote:
On Wed, 28 Mar 2012 19:28:20 +1100
Jim Palfreyman jim77...@gmail.com wrote:
Why do we need really
In message 20120328113122.5c868800...@ip-64-139-1-69.sjc.megapath.net, Hal Mu
rray writes:
Because accurate clocks is the central technology that makes GPS, mobile
phones and the internet work.
What part of the internet depends upon accurate clocks?
SONET at the bottom and eBay endings at
On 3/28/12 1:28 AM, Jim Palfreyman wrote:
So when a member of the general public says:
Why do we need really accurate clocks?
Not necessarily at time-nuts performance, but here's some clock and
clock distribution applications
There are a lot of systems out there that timestamp something
Well the best reason is that by our social convention it makes people
comfortable.
But that reason does have much logic behind it.
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There are good technical reasons for having very accurate standards of
time interval, but IMO, far fewer reasons for ns or even ms accuracy in
time of day.
Most everyday things, except possibly eBay and some financial
transactions, really don't have to happen exactly on the dot.
As to having
batchelo...@yahoo.com wrote
Well the best reason is that by our social convention it makes people
comfortable.
But that reason does have much logic behind it.
One month ago a 38-year old wristwatch resurfaced from a junk box and I
decided to return to it at least temporarily. It drifts some
Mechanical wristwatches are capable of good precision. I have an
inexpensive 40-year old Caravelle (Bulova) that with reasonable
adjustment can still keep to a few seconds per day. I never have
considered quartz watches to be better unless they can be adjusted,
which most cannot.
David
On
Two good reasons:
(1) Many uses in science and engineering. Mostly indirectly, you need
a good frequency standard to calibrate some instrument so you can
measure something. Thinks like distance, current, capacitance are
based on time if you follow the chain long enough.As frequencies
get
On 3/28/2012 1:42 PM, David McGaw wrote:
I never have
considered quartz watches to be better unless they can be adjusted,
which most cannot.
Most decent ones can be. I've got some Citizens and Seikos, which have a
small trimmer cap you can adjust. There's usually a test point nearby
with a
Antonio I8IOV wrote:
I wrote:
Well the best reason is that by our social convention it makes people
comfortable.
But that reason does have much logic behind it.
One month ago a 38-year old wristwatch resurfaced from a junk box and I
decided to return to it at least temporarily. It drifts
1 nanosecond = 1 foot, do you know where you are?
Remember, wherever you go, there you are. Buckaroo Banzai
On 3/28/2012 3:28 AM, Jim Palfreyman wrote:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
Personally I explain that
jim77...@gmail.com said:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
Personally I explain that accurate clocks enable you to pack a higher data
rate into your smart phone. They like that.
Any other thoughts?
Navigation? It goes
jim77...@gmail.com said:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
The alternative is inaccurate clocks, would that ever be preferable?
___
time-nuts mailing list -- time-nuts@febo.com
To
:31 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Best reason
jim77...@gmail.com said:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
The alternative is inaccurate clocks, would that ever be preferable
...@febo.com] On Behalf
Of Chris Dawes
Sent: Thursday, 29 March 2012 2:41 p.m.
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best reason
Hi All,
Thanks Jim P for the thread.
I was lurking hoping for some amazing idea that would help me explain (in
simple
Just remember, to the 'average' person (no such exists in reality), all
technology is magic. The TV remote is a magic wand that you wave at the
TV and recite the proper incantation (sometimes profane). You chant the
spell to your smart phone and you can talk to your friend anywhere in
the
jim77...@gmail.com said:
So when a member of the general public says:
Why do we need really accurate clocks?
What is your answer?
The alternative is inaccurate clocks, would that ever be preferable?
Wouldn't that depend on how late for work you were?
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