One satellite, OK, but before a GPSDO can use 1 satellite it must have the normal satellite visibility to complete the autosurvey (usually 10K seconds long). You can enter the exact lat/lon, if available, and start the 1 satellite operation (known as position hold mode) at once but, usually, surveyed coordinates of a new antenna installation are not available.
On Tue, Apr 9, 2013 at 10:27 AM, Grant Hodgson <[email protected]>wrote: > 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<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.
