Hi Alan and Tom, Note that under the Wireless Telegraphy Act 2006 here in the UK, active GNSS repeaters have to be licenced. See http://194.33.160.59/radiocomms/ifi/enforcement/gpsrepeaters/ and http://stakeholders.ofcom.org.uk/enforcement/spectrum-enforcement/gpsrepeaters/ Even a "normal" active antenna connected to another antenna would qualify as a repeater. Also the "transmit" antenna must be indoors so your through window scheme is out. How about a strip of closed cell foam with a slit for the coax that you can trap in the window? This will allow the coax in while keeping the drafts out.
Regards, Robert G8RPI. ________________________________ From: Tom Van Baak <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Monday, 8 April 2013, 22:12 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.
