Two antennas near each other? Could they interact under some conditions? Could you be seeing multi path in some satellite geometries?
Try spacing them apart or BETTER get a splitter and use only one antenna but take the second antenna an far away, I wonder if it is acting like a reflector or if the amplifier is radiating EMI. On Tue, Nov 19, 2013 at 6:01 AM, Azelio Boriani <azelio.bori...@screen.it>wrote: > One M12+ is the reference and the others are DUTs? Three times but in > one direction only for a 300ns total or what? The offset returned to > 0? Please, detail better what happened. > > On Tue, Nov 19, 2013 at 12:17 PM, Stephan Sandenbergh > <ssandenbe...@gmail.com> wrote: > > Hi, > > > > I've recently measured the 1PPS outputs of three Motorola M12+T GPS > > receivers using two HP53131A TICs. Antennas are located next to one > another. > > > > Now I notice the one M12+T has changed its time offset by 100ns three > times > > over the period of 48hrs. The jitter remains the same, only the offset > that > > changes. > > > > I'm currently having a re-run of the measurement. But, in meanwhile, has > > anyone seen this kind of behaviour? A firmware issue perhaps? > > > > Regards, > > > > Stephan. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
