You still need to set your position to get accurate results with one SV. Rob
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Grant Hodgson Sent: 09 April 2013 09:28 To: [email protected]; [email protected] Subject: Re: [time-nuts] GPS antenna?? Alan As has already been stated by others, if the purpose of the GPS signal is for a GPSDO, then putting an active patch next to a SW facing window should work fine. No need to re-radiate. You only need to receive 1 satellite in order to get a timing signal - more satellites will give better (lower) jitter/ADEV, but if you just want an accurate frequency source for a counter or signal generator then the setup you describe should be fine. If that's the case, then it might be worth taking a Rubidium source as a higher-performance back-up than the GPSDO in holdover, although some GPSDOs are more equal than others in holdover performance. regards Grant Quoting [email protected]: > > 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.
