[time-nuts] GPSDO vs Rb standard

[John C. Westmoreland, P.E.]

Azelio and Fellow Time Nuts,

Isn't the GPS 1PPS signal supposed to be 'precise' to within what error?  I
imagine this is in the specs of the specific receiver -
but I was wondering if some of you have actually measured what that is -
and could report the numbers that you have found.

Thanks!
John Westmoreland



On Wed, Sep 18, 2013 at 3:07 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> Instead of using the Rb's PPS, use the GPS receiver's PPS. Maybe you
> will find out that the Rb is slow... you can also check the Rb's PPS
> against the GPS's PPS.
>
> On Wed, Sep 18, 2013 at 11:47 PM, Bob Stewart <bob at evoria.net> wrote:
> > I hooked the Rb's 1PPS to the trigger input on my old Tek 455, 10MHz
> > GPSDO to Channel A, .05us trace, and turned the lights out so I could
> > see it.  The 10MHz is marching right to left about 1 cycle every 20
> > seconds.  So, can I say that the Rb considers my GPSDO to be too fast by
> about 5ppb?
> >
> >
> > Bob
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