Date: Sun, 31 Jan 2010 22:47:00 +0000 From: dalescott@shaw.ca To: "Christian Weisgerber" <naddy@mips.inka.de>, owner-freebsd-questions@freebsd.org, freebsd-questions@freebsd.org Subject: Re: Re : Recommendation on GPS time source for FreeBSD Message-ID: <1558581203-1264978019-cardhu_decombobulator_blackberry.rim.net-2046217612-@bda291.bisx.prod.on.blackberry> In-Reply-To: <hk4snj$2m6r$2@lorvorc.mips.inka.de> References: <4B64010C.6020604@intersonic.se><431745.67501.qm@web24806.mail.ird.yahoo.com><hk4snj$2m6r$2@lorvorc.mips.inka.de>
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With a clear view of the sky, pretty much any receiver but the lowest grade (havIng a 1pps output) should behave about the same. Ceramic patch antennas should have a decent ground plane. If the antenna is small (e.g. most puck antenna/receivers) put in on a 10in or 12in round metal disk (also blocks low-elevation reflected signals). Getting a lot better may involve considerable testing and characterization (i.e. $$'s), including site survey (line of sight obstacles, sources of multipath...), propagation/group delay in antenna/rf system, hardware involved in generating 1pps (slew rates...), sw tracking loop stability under various conditions (low signal level, addIng or dropping a satellite from the loop, ...). Dale Sent on the TELUS Mobility network with BlackBerry -----Original Message----- From: naddy@mips.inka.de (Christian Weisgerber) Date: Sun, 31 Jan 2010 21:29:23 To: <freebsd-questions@freebsd.org> Subject: Re: Re : Recommendation on GPS time source for FreeBSD Alexandre L. <axelbsd@ymail.com> wrote: > You can see here : http://www.meinberg.de/english/ Meinberg is one of those companies that don't even put price information on the web site: If you have to ask, you can't afford it. -- Christian "naddy" Weisgerber naddy@mips.inka.de _______________________________________________ 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"help
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