Date: Tue, 22 Apr 2003 23:30:31 +0200 From: "Mxsmanic" <mxsmanic@hotmail.com> To: "FreeBSD Questions" <freebsd-questions@freebsd.org> Subject: Re: Accurate time without a network connection? Message-ID: <OE43a3ayxAohRUSbSuT000017d4@hotmail.com> References: <20030422184554.GA13432@grumpy.dyndns.org><20030422211611.10aa753a.freebsd@secspace.de><20030422193250.GA13774@grumpy.dyndns.org> <0cbbav01uff7p1r4cp0ipsrgqk59tdu592@4ax.com>
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In the past I simply watched the time on the server that was to serve as my time reference, noted the drift over a few days, then wrote a very simple daemon that periodically skewed the time to compensate for the drift. I was surprised at how easy it was to get the server to stay within 1 second of the correct time for periods of several days with this simple and crude adjustment. The PC clock was way off (more than six seconds a day), but it was fairly consistently so, so with a bit of tweaking I managed to keep it close to the correct time. I was still happy to get the network connection back up, though. I did look at a few radio-controlled clocks (the GPS ones were not an option, as I have no place to put the antenna), but since I could buy another server for the price of the cheapest among them, they were not really a realistic option. ----- Original Message ----- From: "John Murphy" <jfm@blueyonder.co.uk> To: "David Kelly" <dkelly@hiwaay.net> Cc: <questions@freebsd.org> Sent: Tuesday, April 22, 2003 23:19 Subject: Re: Accurate time without a network connection? > David Kelly <dkelly@hiwaay.net> wrote: > > >Surfing http://www.ntp.org/ has turned up a lot of information but > >little hardware. Of most interest was use of sound card connected to > >radio receiver for decoding the time signals. But that's a touch exotic > >for this application. Else I'd use the $20 LCD "atomic clock" I have on > >my wall, a $25 USB "web-cam", and some sort of OCR. > > I nearly fell off my chair laughing after reading that 'solution'! > > There's a self build method at the following URL with notes for USA users: > http://www.buzzard.org.uk/jonathan/radioclock.html > I'm determined to make one (or two) myself soon. > > I think Charles Swiger gave the answer which will suit you best. > > John. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > >
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