From owner-freebsd-hackers Tue Jan 6 22:46:02 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.7/8.8.7) id WAA17567 for hackers-outgoing; Tue, 6 Jan 1998 22:46:02 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from word.smith.net.au (vh1.gsoft.com.au [203.38.152.122]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id WAA17553 for ; Tue, 6 Jan 1998 22:45:47 -0800 (PST) (envelope-from mike@word.smith.net.au) Received: from word (localhost [127.0.0.1]) by word.smith.net.au (8.8.8/8.8.5) with ESMTP id RAA00910; Wed, 7 Jan 1998 17:08:59 +1030 (CST) Message-Id: <199801070638.RAA00910@word.smith.net.au> X-Mailer: exmh version 2.0zeta 7/24/97 To: Michael Hancock cc: Nate Williams , FreeBSD Hackers Subject: Re: GPS for xntpd Stratum 1 servers In-reply-to: Your message of "Wed, 07 Jan 1998 14:24:28 +0900." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 07 Jan 1998 17:08:58 +1030 From: Mike Smith Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk > In what situations would you need an external antenna? Would I need one > if the Garmin was put into a room on the 15th floor of a 30 floor building > in the middle of the floor farthest away from all windows? As a general rule, you want your antenna to have an unobstructed view of most of the sky. Anything more substantial than paper counts as "obstructed". In your case, I would be putting the entire GPS unit on the roof, and using an RS232-fibre-RS232 arrangement to bring the NMEA data back down to your system. If fibre isn't available, you can do it with a single telco pair as long as you put suitable isolation and lightning suppression on it; even a nearby strike will induce a godawful spike in a 15-storey cable. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\