The 20 degree cutoff is what I recall the starloc uses as a default. Now I don't know how important it is to filter those out by the response pattern of the antenna versus by software.
-----Original Message----- From: "Rob Kimberley" <[email protected]> Sender: [email protected] Date: Thu, 25 Oct 2012 20:24:58 To: 'Discussion of precise time and frequency measurement'<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Timing performance of servers We used to filter out anything 10 - 20 degs above the horizon when setting up timing receivers. Typically there's a lot of noise down low (multipath and tropo effects). As long as you've got plenty of SVs you don't need to go way down to the horizon. Rob Kimberley -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Albertson Sent: 25 October 2012 20:09 To: [email protected]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Timing performance of servers On Thu, Oct 25, 2012 at 11:02 AM, <[email protected]> wrote: > The GPS seeing the horizon isn't required. Those satellites are filtered out by software. OK, technically it needs to see down to within 10 degrees of the horizon. But when you are choosing a location for the mast to the horizon or withing 10 degrees of it looks pretty much the same. I don't want a huge tree of building due south of the antenna. But for timing all you really need is to see "most" of the sky. It depends on if you want it to work or work as well as it can. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
