Message-ID: <BE8CB6539B16464E9C1F7B34003EC58D@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <50995FB6.5030209@freenet.de>
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Date: Tue, 6 Nov 2012 19:56:29 -0000
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Subject: Re: LF: Computer time synchronisation / Dimension 4
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Wolf ,

How   far  from the  time  server  ?

I have  Just  check  and re-sync   shows  at  +0.003  , +0.002 ,   +0.002

using Manchester   25 miles  from me

G..

--------------------------------------------------
From: "wolf_dl4yhf" <dl4yhf@freenet.de>
Sent: Tuesday, November 06, 2012 7:06 PM
To: "RSGB LF Group at blacksheep" <rsgb_lf_group@blacksheep.org>; "RSGB LF 
Group at Yahoo" <rsgb_lf_group@yahoogroups.co.uk>
Subject: LF: Computer time synchronisation / Dimension 4

> Greetings all,
>
> For the WSJT experiments, I had installed Dimension 4 on a windows 7 
> machine.
>
> Seemed to work (at least I thought), but then I made these observations:
>
> - on the Windows 7 machine, WSJT-X almost never decoded
>
> - When asking Dimension 4 to re-synchronize the PC's system time via 
> internet, the program repeatedly reported an offset of 0.7 to 0.8 seconds. 
> Even when repeated a few seconds later, D4 still reported such an 
> unusually large difference between "internet time" and the local time.
>
> - Then modified the properties of D4 (after right-clicking on its icon) to 
> run it with administrator privileges
>
> - Then tried the second step again: Repeatedly asked D4 to 'synchronize 
> now', in short intervals. Result: First corrected by 0.7 seconds, but 
> after that, only by something like +40 milliseconds, -40 milliseconds, +40 
> milliseconds, etc. This is a similar behaviour as it had when D4 was 
> running on the trusty old windows XP machine.
>
> I haven't tried WSJT-X again since then, but maybe later..
>
> BTW Window's own time-synchronizing service hardly ever works here, 
> regardless of which time server is selected.
>
> Guesswork: Maybe without admin privileges, Dimension 4 can detect the 
> offset, but fails to set the PC's system time to the new (synchronized) 
> value. Maybe others which get lots of "10 sync points but no text" in JT9 
> can try this on their (Vista- or Windows 7-) machines, too.
>
> All the best,
>    Wolf DL4YHF .
>
> (now heading for DF0WD; no email there, but I will look out for LA5VNA and 
> others arount 501.5 kHz. WX here terrible, cold and rainy, so I don't 
> think I will stay at the club for very long)
>