[time-nuts] Interesting paper: Don't GPSD' your Rb...

Azelio Boriani azelio.boriani at screen.it
Thu May 3 22:30:30 UTC 2012


And maybe the problem is worse: I want also to keep aligned the PPS. To
recover the PPS position (without phase jumps) it is mandatory to slightly
force the 10MHz. Better start the machine and take measures...

On Fri, May 4, 2012 at 12:20 AM, Brian, WA1ZMS <wa1zms at att.net> wrote:

> At the risk of over simplifying it: Doesn't it all always depend on the
> loop
> BW you pick?
>
> Inside the loop BW you see the noise of the loop's reference. Outside the
> loop BW you see the free running noise of the oscillator.
> At and around the loop's corner frequency you see a combination of both.
> The choice of loop BW depends on what Tau you want
> and what grade of Rb you are trying to improve.
>
> But as PHK said, the article was a bit thin on details.
>
>
> -Brian, WA1ZMS
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Azelio Boriani
> Sent: Thursday, May 03, 2012 6:06 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Interesting paper: Don't GPSD' your Rb...
>
> OK, I've read the paper. Why not GPSDiscipline your Rb? GPSDiscipline "cum
> grano salis" but do it. My LPFRS GPS disciplinator hardware is ready. OK, I
> know, the 1E-11 step is too large but I'll try. First I'll take
> measurements
> so that I can think about a disciplining algorithm. Then a hardware
> modification on the LPFRS to get access to the C-field could make it
> better.
>
> On Thu, May 3, 2012 at 11:29 PM, Poul-Henning Kamp
> <phk at phk.freebsd.dk>wrote:
>
> >
> > This is pretty think, but interesting:
> >
> > http://tf.nist.gov/sim/Papers/Trigo_CPEM_2010.pdf
> >
> > --
> > Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> > phk at FreeBSD.ORG         | TCP/IP since RFC 956
> > FreeBSD committer       | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by
> incompetence.
> >
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