Re: Clarifications about PPS SHM content

[Gary E. Miller]

Yo Martin!

On Fri, 3 Apr 2020 12:15:15 -0400
Martin Boissonneault <address@hidden> wrote:

> Just a quick update: _My jitter wasn't caused by ntpheat._
> For the past few days, I turned off ntpheat and this bad ~700ns
> jitter (had ~265ns before) is continuing. I've been hunting the
> cause, the clue I have is a negative clock offset spike every 45min.

Chasing ns is harder than it looks.

> So far, I think it's the timeout period of the ADS-B decoders
> (~3888s). My current hypothesis is that there are so few planes up
> there that the feeders/decoders restart because they haven't seen a
> plane in 45min. So, I've shut down the ADS-B decoders/feeders.

I'm unfamiliar with how dump978 and dump1090 do their thing...

> If I'm right, I'll know in a few hours! Then, if it's fixed, I'll be 
> able to brag about my NTP server being affected by COVID-19 ;-)

Fingers crossed.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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