[time-nuts] Some results of PRS10 and Trimble Resolution

Magnus Danielson cfmd at bredband.net
Wed Jun 28 16:56:45 EDT 2006

From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
Subject: Re: [time-nuts] Some results of PRS10 and Trimble Resolution
Date: Wed, 28 Jun 2006 20:38:48 +0000
Message-ID: <28924.1151527128 at critter.freebsd.dk>

> In message <53b.1a8d21e.31d43e38 at aol.com>, SAIDJACK at aol.com writes:
> >Using an interpolator with a slow basic clock as Magnus suggests  is probably 
> >the easiest way to prevent EMI issues, but it has some  disadvantages such as:
> > 
> >* You need to design a fairly tricky [...]
> I actually benchmarked the on in the PRS10 by feeding it a 1PPS
> generated from another Rb that was deliberately adjust approx 1e-10
> low.
> I can't seem to find the results anymore, but if any of you want to
> reproduce it, it was a pretty trivial setup.
> As I remember it, the standard deviation was approx 3nsec, and I
> seeing some "missing codes", Ie: readings that just didn't
> happen in practice.

This can happend with some interpolator designs. The reason is how you treat
the data and correct for scale-error. You will move the statistics you expect
for one sample to one of the neighbor samples. There are naturally some easy
tricks around that one. ;O)


More information about the time-nuts mailing list