Message-ID: <8840D182F8BB7540B173D2B1FA0CA9AB018AE33A@argos.clb.tcfr.thales>
From: Jean-Louis.RAULT@fr.thalesgroup.com
To: rsgb_lf_group@blacksheep.org
Date: Fri, 13 Feb 2004 13:02:14 +0100
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Subject: RE: LF: Timing GPS
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> -----Message d'origine-----
> De : Alan Melia [mailto:Alan.Melia@btinternet.com]
> Envoyé : vendredi 13 février 2004 12:25
> À : rsgb_lf_group@blacksheep.org
> Objet : Re: LF: Timing GPS
> 
> 
> Hello again Jean-Louis. I had thought about that ( software 
> clock drift
> dependent on cpu usage) and wondered whether it would be 
> possible to force
> the software clock to sync with the hardware clock at regular 
> intervals
> (say 30 mins) using the scheduler. This could possibly be run 
> behind the
> capture program if not incorporated into it ??  I am not sufficiently
> knowledgable about windows to now how to do it.
> 
> Cheers de Alan G3NYK
> alan.melia@btinternet.com
> 
> ----- Original Message -----
> From: <Jean-Louis.RAULT@fr.thalesgroup.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: 13 February 2004 08:59
> Subject: RE: LF: Timing GPS
> 
> 
> Hi all
> 
> Please keep in mind that Windows operating systems are very poor "time
> keepers".
> They drift very quickly, depending on the programs you are running.
> A drift of one second up to one minute per day is not 
> uncommon (specially
> with "data crunchers" softwares like real time FFT computing)!
> I'm not talking about the drift of the PC hardware clock 
> itself which is
> quite good (the time base xtal oscillator drifts around 2 s 
> per month on my
> own computer), but from the Windows time management.
> It seems that the time management on the Windows multitask OS 
> has a very low
> priority ...
> I verified this on Windows 95, Windows 98 and Windows Me.
> Any other experience with other operating systems ?
> 
> 73 de Jean-Louis F6AGR
> 
> 
> 
> 
> 
> 
>