of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, October 09, 2014 4:43 PM
Subject: [time-nuts] GPS jump
Folks,
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On around ~Oct 7 we have
gign...@gmail.com said:
Is it actually possible to phase lock two oscillators together cross the
distance from DC to Colorado Springs? (2400 kilometers or so). ?
I think so - if your clocks are stable enough.
There is probably a simple rule for PLL stability based on round-trip-time
and
On 2014-10-11 00:49, Hal Murray wrote:
gign...@gmail.com said:
Is it actually possible to phase lock two oscillators together cross the
distance from DC to Colorado Springs? (2400 kilometers or so). ?
I think so - if your clocks are stable enough.
There is probably a simple rule for PLL
measurement
time-nuts@febo.com
Sent: Thursday, October 09, 2014 4:43 PM
Subject: [time-nuts] GPS jump
Folks,
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On around ~Oct 7 we have noticed that the normal
Hi
On Oct 10, 2014, at 11:20 PM, Brian Inglis brian.ing...@systematicsw.ab.ca
wrote:
On Oct 9, 2014, at 7:43 PM, Jim Palfreyman jim77...@gmail.com wrote:
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On
Hal,
On 10/11/2014 08:49 AM, Hal Murray wrote:
gign...@gmail.com said:
Is it actually possible to phase lock two oscillators together cross the
distance from DC to Colorado Springs? (2400 kilometers or so). ?
I think so - if your clocks are stable enough.
There is probably a simple rule
Hi
To the extent that anything *is* locked, it’s been done for a lot longer than
the 1980’s. Long before common view GPS, Loran-C observations (and corrections
via clock trips) were used. You can look at it as a PLL, just a *very* fancy
one with *very* long time constants.
Bob
On Oct 11,
On 10/11/14, 8:08 AM, Bob Camp wrote:
Hi
To the extent that anything *is* locked, it’s been done for a lot longer than
the 1980’s. Long before common view GPS, Loran-C observations (and corrections
via clock trips) were used. You can look at it as a PLL, just a *very* fancy
one with *very*
Hi
The interesting thing about keeping ensembles of primary standards in line is
that the boundary between “post processing” and “real time” blurs quite a bit.
Looking at the papers, in many cases they are looking at all of what’s gone on
over the last year or two and guessing at what will
On Oct 9, 2014, at 7:43 PM, Jim Palfreyman jim77...@gmail.com wrote:
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On around ~Oct 7 we have noticed that the normal steady straight line (with
standard daily noise)
I'm trying to determine semantics and I was likely mistaken.
They regularly update them both a variety of technologies - TWTCC and
others. Then DC of course sends to COS.
Is it actually possible to phase lock two oscillators together cross the
distance from DC to Colorado Springs? (2400
No. They don't directly if that's what you mean. They do regular time
transfers, likely more regularly than most due to accessibility to a common
view and common interest.
The GPS consolation is actually a sub-(sub?)-scale of UTC(USNO_MC) called i
think USNO_OSC? Have to check.
They have been
Folks,
We look after 5 separate hydrogen masers spread all over Australia and we
collect tic phases between the masers and the GPS.
On around ~Oct 7 we have noticed that the normal steady straight line (with
standard daily noise) took a noticeable downward turn - on all 5 masers.
Did anyone
Hello Jim,
I am just a novice here - but, when you say noticeable, can you please tell
us how noticeable? What is a small downturn vs. a noticeable one?
I just put up an outdoor GPS antenna. If there is anything I can do to
possibly help, please give me instructions.
I do not have direct
Hi
GPS is steered by the Air Force last time I checked.
A really good place to check is the NIST Time and Frequency pages that show
both real time and historical data for each GPS sat compared to NIST time:
http://www.nist.gov/pml/div688/grp40/gpsarchive.cfm
Hopefully it’s accessible via
Le 10 oct. 2014 à 03:09, Bob Camp a écrit :
Hi
GPS is steered by the Air Force last time I checked.
A really good place to check is the NIST Time and Frequency pages that show
both real time and historical data for each GPS sat compared to NIST time:
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