Hi More or less there aren't any GPS sats due north unless you can "see" over the pole. That does assume you are in the northern hemisphere. If you watch a "sats in view plot" for a couple days, Your odds of finding something are best towards the equator and diminish as swing around towards the pole. If you have a choice of windows, south is your best bet (in the UK).
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Monday, April 08, 2013 3:51 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS antenna?? Aren't GPS birds all over the sky. South facing is for the Clarke belt. -----Original Message----- From: "Bob Camp" <[email protected]> Sender: [email protected] Date: Mon, 8 Apr 2013 15:28:14 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] GPS antenna?? Hi Is the proposed window south facing? If not, you will need enough cable outdoors to get your second antenna to a south facing location. Assuming it's south facing and reasonable sky view, have you tried a patch antenna on / at the window? That should at least give you some idea of how likely the signal is to get through it. It's not uncommon to run GPSDO's with window mounted antennas. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Alan Melia Sent: Monday, April 08, 2013 1:00 PM To: time-nuts measurement Subject: [time-nuts] GPS antenna?? Hi all an interesting problem you may have encountered, I want to use a GPS frequency standard inside a building with no opening windows (opening windows are known as air conditioning in the UK :-)) ) This is part of a two day amateur microwave conference so we should have the expertise. I intend to try and pass the signal through a a double glazed glass window unit (hopefully not metalised) using a couple of patch antennas. The outer GPS antenna is active so will need a 5v supply via an inserter. Inner patch active, outer patch passive to avoid problems of feedback. Main antenna can be shielded from the "coupling" either physically or with a slab of absorber. Has anyone tried this?.... does it work?.....any gotchas? Thanks Alan G3NYK _______________________________________________ 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. _______________________________________________ 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.
