[ntp:questions] gps outlier

folkert folkert at vanheusden.com
Mon Nov 21 19:04:42 UTC 2016


I have 5 rpis with 3 adafruit gpses, some glonas and a venus gps; they all
agree with each other about when a second starts.

Now I added a garmin 18x lvc (via a level shifter) and even after an
hour it shows an offset of around -0.114ms upto -0.123ms (it jumps),
jitter of 12us.
What can be the cause of this strange offset? The jitter I can
understand as I use the userspace tool for interfacing it to ntp.

Folkert van Heusden


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