That's odd, I'm sure we are using one here - and have been for quite a few years. It was used to supply gps signals to buoy systems which were being tested indoors. I seem to recall it was a bit 'hit and miss' and suffered from multipath problems (but it was set up by the sonar guys who don't know any better.....). Similar devices were shown at the NPL recently during a seminar on gps jamming/mitigation so they are still around.
Paul Reeves, G8GJA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rob Kimberley Sent: 09 April 2013 12:51 To: 'Tom Van Baak'; 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] GPS antenna?? Unfortunately, (I think this is still valid in the UK), we are not allowed to use GPS re-radiators. I need to check latest rules & regs. Rob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tom Van Baak Sent: 08 April 2013 22:12 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS antenna?? Alan, Google for words like GPS re-radiator or GPS repeater. There are also units on eBay. If not to buy, at least to study examples. The one I have is made by www.gpssource.com but it seems you could build one yourself. It's easy to test by looking at your indoor SV count and reception levels. With patch antennae you don't have to worry about RHCP issues, right? /tvb ----- Original Message ----- From: "Alan Melia" <[email protected]> To: "time-nuts measurement" <[email protected]> Sent: Monday, April 08, 2013 9:59 AM 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.
