[time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time

Rob Kimberley robkimberley at btinternet.com
Wed Oct 11 11:54:03 EDT 2017


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 at 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 at 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 at chriswilson.tv
> 
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"The power of accurate observation is commonly called cynicism by those who have not got it. » George Bernard Shaw

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