From owner-freebsd-questions@FreeBSD.ORG Tue Apr 22 14:30:33 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3156C37B401 for ; Tue, 22 Apr 2003 14:30:33 -0700 (PDT) Received: from hotmail.com (oe43.law8.hotmail.com [216.33.240.15]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8143043FD7 for ; Tue, 22 Apr 2003 14:30:32 -0700 (PDT) (envelope-from mxsmanic@hotmail.com) Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 22 Apr 2003 14:30:32 -0700 Received: from 81.50.80.3 by oe43.law8.hotmail.com with DAV; Tue, 22 Apr 2003 21:30:32 +0000 X-Originating-IP: [81.50.80.3] X-Originating-Email: [mxsmanic@hotmail.com] From: "Mxsmanic" To: "FreeBSD Questions" References: <20030422184554.GA13432@grumpy.dyndns.org><20030422211611.10aa753a.freebsd@secspace.de><20030422193250.GA13774@grumpy.dyndns.org> <0cbbav01uff7p1r4cp0ipsrgqk59tdu592@4ax.com> Date: Tue, 22 Apr 2003 23:30:31 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: X-OriginalArrivalTime: 22 Apr 2003 21:30:32.0377 (UTC) FILETIME=[67509290:01C30916] Subject: Re: Accurate time without a network connection? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Apr 2003 21:30:33 -0000 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" To: "David Kelly" Cc: Sent: Tuesday, April 22, 2003 23:19 Subject: Re: Accurate time without a network connection? > David Kelly 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" > >