Hi If the windows are of the permanently fixed variety - how about a rock …:)
Since most windows are likely pretty good sized, and this *is* a microwave conference …. how about some sort of meter square purpose built antenna? For the uber-exotic approach - modulate a laser with the GPS signal and move the signal through the window as light. Bob On Apr 8, 2013, at 5:32 PM, Robert Atkinson <[email protected]> wrote: > 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. _______________________________________________ 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.
