[time-nuts] Strange 100ns jumps on Motorola M12+T

[Chris Albertson]

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.boriani at 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
> <ssandenbergh at 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 at 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 at 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