In message [EMAIL PROTECTED], Chuck Harris writes:
[I split off this topic, it's interesting in its own right I think]
It may not be their fault. Have you tried taking modern toys apart
? Or a radio ? A TV-set ? There is nothing in there our kids can
learn anything from :-(
I must be
Does your phase plot mean that a mains powered wall clock might be off
by 10 seconds?
Have Fun,
Brooke Clarke, N6GCE
Yes. I also keep an old AC synchronous motor
wall clock around just to see this effect. To be
fair, it is unusual for it to be off this much, or
for very long.
Maybe we
In message [EMAIL PROTECTED], Chuck Harris writes:
Just because people don't care or notice, doesn't mean not important
to them.
Most people don't care about water, sewers, electricity and civil
order. That doesn't mean it's not important to them. They care
a lot as soon as it doesn't
In message [EMAIL PROTECTED], Warner Losh writes:
Certainly. But what's your point? I don't see these utilities failing
if a second slips here or there. The one case where time is critical
is the power grid, and they keep their own time (Which, IIRC
approximates UTC).
The long term
In message [EMAIL PROTECTED], Tom Van Baak writes:
You know, if the stackable TAPR module
project catches on another PCB on the list
could be a mains frequency monitor.
It would robustly filter and divide the 50/60 Hz
mains frequency to 1 PPS and then onboard
compare that 1 PPS against the local
In message: [EMAIL PROTECTED]
Poul-Henning Kamp [EMAIL PROTECTED] writes:
: Until after a leap-second hands in the unbudgeted expense or if
: we are lucky: the budget request.
:
: You won't see any such budget request. None happened 7 years ago,
: and none will happen this time
TVB said, If there's a power
industry person in time-nuts we'd love to ask you
a few questions.
I'm not a power industry person, but I've researched the
problem over the years. Here are some of the results.
The generators are all synchronous machines. The ones in
one power plant rotate with
In message [EMAIL PROTECTED], Tom Van Baak writes:
2005 is the 100th anniversary of Einstein's first set
of famous papers, including the one on relativity.
This has received a fair amount of press this year.
Less well known is that 2005 is also considered
the 50th anniversary of the atomic clock.
Tom Van Baak wrote:
You know, if the stackable TAPR module
project catches on another PCB on the list
could be a mains frequency monitor.
It would robustly filter and divide the 50/60 Hz
mains frequency to 1 PPS and then onboard
compare that 1 PPS against the local (OCXO,
atomic, or GPS) 1 PPS
At 02:40 AM 7/28/2005, M. Warner Losh wrote...
The Turin leap second survey said that loss of life had occurred due
to a leap second insertion event.
That is a deliberately misleading statement. It MUST be the case that the loss
of life occurred due to and improperly designed, incorrectly
Mike S wrote:
At 02:40 AM 7/28/2005, M. Warner Losh wrote...
The Turin leap second survey said that loss of life had occurred due
to a leap second insertion event.
That is a deliberately misleading statement. It MUST be the case that the loss
of life occurred due to and improperly
I've set up a wiki at http://www.febo.com/time-nuts (I want to change
that to /wiki/time-nuts, but at the moment that doesn't seem to work).
There's presently no content there beyond a simple introduction.
Would someone (or multiple someones) here be willing to do some initial
structure and
Hi Lymex,
A DBM is a standard RF component, so I
don't think it's something you would build.
HP made them years ago (HP 10514A) and
companies like Mini-Circuits still do; in great
variety and quantity. See, for example:
http://www.minicircuits.com/dg03-102.pdf
Tom Van Baak wrote:
Hi Lymex,
A DBM is a standard RF component, so I
don't think it's something you would build.
HP made them years ago (HP 10514A) and
companies like Mini-Circuits still do; in great
variety and quantity. See, for example:
http://www.minicircuits.com/dg03-102.pdf
[EMAIL PROTECTED] (Mike S) writes:
Programmers cause programming errors. Leap seconds may make them apparent.
Certainly the death (if it occurred) was not an automatic result of the
leapsecond, but rather was the result of something that broke because it
wasn't properly programmed to deal
At 01:58 PM 7/28/2005, Bjorn Gabrielsson wrote...
How does a properly implemented system accounting for leapseconds fail
when leapseconds fail to come? Sure there will be unnessesary code
that could be removed. But I do not see why the system would break.
It will break if the system is built on
The legal system in the US (and many other countries) is based on
solar time, so it would break legal timekeeping.
It is only kinda based on solar time. And only at certain locations,
It is true that the definition of the time zones, in 15 USC 261
states, in part:
the standard time
[EMAIL PROTECTED] (Mike S) writes:
At 01:58 PM 7/28/2005, Bjorn Gabrielsson wrote...
How does a properly implemented system accounting for leapseconds fail
when leapseconds fail to come? Sure there will be unnessesary code
that could be removed. But I do not see why the system would break.
At 06:50 PM 7/28/2005, Bjorn Gabrielsson wrote...
[EMAIL PROTECTED] (Mike S) writes:
It will break if the system is built on the basis that UTC is within
0.9 seconds of UT1, which is how UTC is currently defined.
Seems to be a minor concern.
Personal opinions don't count. To you it's minor,
Hi everyone,
I'm very glad to be here for the first time.
Thank you John for manually registered me in.
Thank you Tom Van Baak for putting my e-mails here and also
for your great answer which clear up most of my confusions.
Sorry for my poor English because its not my mother tongue.
I
Hi,
I managed to find a copy of the Cable Delay App Note
somebody asked about not too long ago. Should I have
John Ackermann post it on his site ... or Tom Van Baak
on his site? Any takers? :-) It is in .pdf format.
Tnx,
Jim
---
Jim Johnson
Agilent Laboratories
Palo Alto,
I was the one who asked. It should certainly be posted somewhere for
everyone, but if not, please do send me a copy.
Thanks.
- Original Message -
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thursday, July 28, 2005 5:43
Subject: [time-nuts] Agilent App Note 174-10 (Cable
At 07:28 PM 7/28/2005, Tom Van Baak wrote...
or leap hours, is suitable to civil time. The key
thing about UTC is the C, the coordination
between atomic and astronomical time. The
UTC leap hour proposal honors that.
The key to your claim, coordinated, does not refer to the synchronization of
UTC
Hi,
I managed to find a copy of the Cable Delay App Note
mebody asked about not too long ago. Should I have
John Ackermann post it on his site ... or Tom Van Baak
on his site? Any takers? :-) It is in .pdf format.
Tnx,
Jim
It's here now:
Agilent App Note 174-10 (Cable Delay)
The key to your claim, coordinated, does not refer to the
synchronization of UTC with UT1. It refers to coordination of multiple
physical clocks
Mike,
Well, there's a lot of coordination going on.
TAI is the coordination of multiple, physical
atomic clocks.
UTC is the coordination of
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