Re: Re: Any nice example of chrony, WWVB, Raspberry Pi ?

Miroslav Lichvar <[email protected]> Tue, 22 Oct 2024 09:28:54 +0200

Newsgroups	gmane.comp.time.chrony.user
Message-ID	<ZxdUNn9HjUdYgCfQ@localhost>

On Mon, Oct 21, 2024 at 07:14:23PM +0000, Mike Collins wrote:
> [piclock]:</home/pi/> chronyc sourcestats
> Name/IP AddressÂ Â Â Â Â Â Â Â Â Â Â  NPÂ  NRÂ  SpanÂ  FrequencyÂ  Freq SkewÂ  OffsetÂ  Std Dev
> ==============================================================================
> PPSÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  6Â Â  3Â Â Â  77Â  +1999.734Â Â  5613.035Â  +1966usÂ Â Â  36ms

These values are bad. A well-working PPS source should show much
better skew and std dev. A rpi should be capable of getting below
1 ppm and 100 microseconds. I suspect there is still something wrong
with your setup. Maybe some noise is picked on the GPIO.

-- 
Miroslav Lichvar


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