Date: Thu, 4 Apr 1996 00:22:33 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: lehey.pad@sni.de (Greg Lehey) Cc: pol@leissner.se, freebsd-questions@FreeBSD.ORG Subject: Re: Public NTP-servers? Message-ID: <199604031452.AAA20560@genesis.atrad.adelaide.edu.au> In-Reply-To: <199604030921.LAA00331@nixpbe.pdb.sni.de> from "Greg Lehey" at Apr 3, 96 12:37:10 pm
next in thread | previous in thread | raw e-mail | index | archive | help
Greg Lehey stands accused of saying: > > Various standards bodies round the world broadcast an accurate time > signal, backed up by an atomic clock with sub-microsecond accuracy. > The German one is called DCF-77, is located in Frankfurt am Main, and > can be received up to 1000 km away. I don't know if that includes > your location, but it's likely that some other source would be > available in Sweden. Have a look at http://www.igel.de/eiclock.htm > for further details, but don't look at the prices. BTW, the $ price > is significantly higher than the DM price mentioned in the German > version of the page (http://www.igel.de/diclock.htm) Not to detract from Greg's suggestion (US$70 is a keen price 8), but another alternative is a low-cost GPS receiver. (If you're synching a large network, that is 8) We're using a custom wrapper around a Rockwell Microtracker LP module, which you would normally listen to in NMEA mode. The module and an active antenna is costing us around AUS$600, which is pretty good for +/- 10msec. (We want GPS for site coordinates to calculate true dawn/dusk and because that's what everybody else uses...) A good GPS supplier should be able to sell you a mothercard for this module that adds power supply and RS-232 functions. AFAIK, xntpd is happy listening to NMEA - I'm just pissed that the guy laying out our clock forgot the '232 interface I asked for 8( > Offhand, at the office, I only found Igel. I'll check later when I get home. If you have more information or pointers on these receivers, Greg, I'd be _very_ keen to hear about them. > Greg -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199604031452.AAA20560>