Re: [chrony-users] raspberry PPS Adafruit Ultimate GPS - rare PPS fix

["Jochen Demmer" <jochen@xxxxxxxxxxxxx>]

Hi,

sorry for the expired paste...
I was not able to manage so I tried something else and connected an old USB DCF77 and referenced the PPS to that source. Does it make sense to you? The values look legit.

This is the config snippet:
refclock PPS /dev/pps0 lock DCF trust prefer
refclock SHM 0:perm=0644 precision 1e-1 offset 0 delay 0.55 refid NMEA trust noselect
#USB DCF77
refclock SHM 1:perm=0644 refid DCF

The USB Device is being fed by radioclk.

Here are outputs of sources and sourcestats
https://paste.debian.net/1197122/
https://paste.debian..net/1197123/

Regards
Jochen

On Monday, May 10, 2021 09:35 CEST, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
 
> On Sat, May 08, 2021 at 11:05:16AM +0200, Jochen Demmer wrote:
> > This is an chronyc sources when I had a recent fix:
> > https://paste.debian.net/1196767/
>
> It seems the posts expired.
>
> > Could someone point me at what's going on?
> > I understand that PPS is only being accepted under specific circumstances. Where can I read what those circumstances are and how do I see in chrony whether those are met or not and why?
>
> Most likely, the offset of the SHM source is not set accurately enough
> for the PPS to lock to it.
>
> https://chrony.tuxfamily.org/faq.html#_using_a_pps_reference_clock
>
> --
> Miroslav Lichvar
>
>
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