NTP linked PC clock is slightly ahead of Lady Heather GPS time
11/10/2017 12:24
Probably a simple answer, but I am curious as to why my PC clock
which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's
time, locked to a Trimble Thunderbolt by about half a second
(guesstimate..) I caught a screen shot of the discrepancy just now,
it's at http://www.gatesgarth.com/time.jpg
I use NTP for low signal WSPR transmissions and a second out isn't the
end of the world, if indeed something IS out. More academic than
problematic, thanks
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
I have Win7-64 and my LH and system time are the same (with a very short delta of < 0.2s probably due to their respective window update time).
I use the Meinberg disturb of NTP. My client’s offset from the paris observatory is less than a millisec.
Maybe you should check your NTP status and see what offset you get from a known good source with ntpdate -b -d <name or IP>.
Le 11 oct. 2017 à 13:29, Chris Wilson chris@chriswilson.tv a écrit :
11/10/2017 12:24
Probably a simple answer, but I am curious as to why my PC clock
which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's
time, locked to a Trimble Thunderbolt by about half a second
(guesstimate..) I caught a screen shot of the discrepancy just now,
it's at http://www.gatesgarth.com/time.jpg
I use NTP for low signal WSPR transmissions and a second out isn't the
end of the world, if indeed something IS out. More academic than
problematic, thanks
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
I'm using the Meinberg NTP Distribution here with their NTP Monitor prog on Win10-64, and two GPS NTP servers.
Config settings: -
server 192.168.1.120 iburst minpoll 4 maxpoll 5
server 192.168.1.121 iburst minpoll 4 maxpoll 5
Consistent sub millisecond results. I've also found that Win10 actually performs way better than Win7.
Rob
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Mike Cook
Sent: 11 October 2017 16:26
To: Chris Wilson; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
I have Win7-64 and my LH and system time are the same (with a very short delta of < 0.2s probably due to their respective window update time).
I use the Meinberg disturb of NTP. My client’s offset from the paris observatory is less than a millisec.
Maybe you should check your NTP status and see what offset you get from a known good source with ntpdate -b -d <name or IP>.
Le 11 oct. 2017 à 13:29, Chris Wilson chris@chriswilson.tv a écrit :
11/10/2017 12:24
Probably a simple answer, but I am curious as to why my PC clock
which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's
time, locked to a Trimble Thunderbolt by about half a second
(guesstimate..) I caught a screen shot of the discrepancy just now,
it's at http://www.gatesgarth.com/time.jpg
I use NTP for low signal WSPR transmissions and a second out isn't the
end of the world, if indeed something IS out. More academic
than problematic, thanks
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
"The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
For those who are in Europe there is the PTB (Physikalisch-Technische
Bundesanstalt, the German Federal institute of Physics and Technology)
service to check the PC's time:
https://uhr.ptb.de/
On Wed, Oct 11, 2017 at 5:25 PM, Mike Cook michael.cook@sfr.fr wrote:
I have Win7-64 and my LH and system time are the same (with a very short delta of < 0.2s probably due to their respective window update time).
I use the Meinberg disturb of NTP. My client’s offset from the paris observatory is less than a millisec.
Maybe you should check your NTP status and see what offset you get from a known good source with ntpdate -b -d <name or IP>.
Le 11 oct. 2017 à 13:29, Chris Wilson chris@chriswilson.tv a écrit :
11/10/2017 12:24
Probably a simple answer, but I am curious as to why my PC clock
which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's
time, locked to a Trimble Thunderbolt by about half a second
(guesstimate..) I caught a screen shot of the discrepancy just now,
it's at http://www.gatesgarth.com/time.jpg
I use NTP for low signal WSPR transmissions and a second out isn't the
end of the world, if indeed something IS out. More academic than
problematic, thanks
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
"The power of accurate observation is commonly called cynicism by those who have not got it. »
George Bernard Shaw
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Details of Loopstats..
Rob
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Rob Kimberley
Sent: 11 October 2017 16:54
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
I'm using the Meinberg NTP Distribution here with their NTP Monitor prog on Win10-64, and two GPS NTP servers.
Config settings: -
server 192.168.1.120 iburst minpoll 4 maxpoll 5
server 192.168.1.121 iburst minpoll 4 maxpoll 5
Consistent sub millisecond results. I've also found that Win10 actually performs way better than Win7.
Rob
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Mike Cook
Sent: 11 October 2017 16:26
To: Chris Wilson; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
I have Win7-64 and my LH and system time are the same (with a very short delta of < 0.2s probably due to their respective window update time).
I use the Meinberg disturb of NTP. My client’s offset from the paris observatory is less than a millisec.
Maybe you should check your NTP status and see what offset you get from a known good source with ntpdate -b -d <name or IP>.
Le 11 oct. 2017 à 13:29, Chris Wilson chris@chriswilson.tv a écrit :
11/10/2017 12:24
Probably a simple answer, but I am curious as to why my PC clock
which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's
time, locked to a Trimble Thunderbolt by about half a second
(guesstimate..) I caught a screen shot of the discrepancy just now,
it's at http://www.gatesgarth.com/time.jpg
I use NTP for low signal WSPR transmissions and a second out isn't the
end of the world, if indeed something IS out. More academic
than problematic, thanks
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
"The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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Hello,
According to that clock LH is lagging about 0.5 seconds behind... PC
time matches it exactly, as close as the eye can tell. Thanks for the
replies.
on 11/10/2017 17:11 you wrote:
For those who are in Europe there is the PTB (Physikalisch-Technische
Bundesanstalt, the German Federal institute of Physics and Technology)
service to check the PC's time:
https://uhr.ptb.de/
--
Best Regards,
Chris Wilson.
Hi Rob,
Rob Kimberley wrote:> I'm using the Meinberg NTP Distribution here with
their NTP Monitor prog on Win10-64, and two GPS NTP servers.> > Config
settings: -> > server 192.168.1.120 iburst minpoll 4 maxpoll 5>
server 192.168.1.121 iburst minpoll 4 maxpoll 5> > Consistent sub
millisecond results. I've also found that Win10 actually performs way
better than Win7.
This is because with Windows 8 and newer there is a new API call to read
the system time with 100 ns resolution. The older API provides only 1 ms
resolution.
ntpd uses the new API, if available.
Martin
Hi Martin,
Thanks for this.
Rob
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Martin Burnicki
Sent: 11 October 2017 18:17
To: time-nuts@febo.com
Subject: Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
Hi Rob,
Rob Kimberley wrote:> I'm using the Meinberg NTP Distribution here with their NTP Monitor prog on Win10-64, and two GPS NTP servers.> > Config
settings: -> > server 192.168.1.120 iburst minpoll 4 maxpoll 5>
server 192.168.1.121 iburst minpoll 4 maxpoll 5> > Consistent sub millisecond results. I've also found that Win10 actually performs way better than Win7.
This is because with Windows 8 and newer there is a new API call to read the system time with 100 ns resolution. The older API provides only 1 ms resolution.
ntpd uses the new API, if available.
Martin
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