> On May 9, 2016, at 5:59 PM, Eric S. Raymond <e...@thyrsus.com> wrote: > > Frank Nicholas <fr...@nicholasfamilycentral.com>: >> This is the “/etc/ntp.conf” I used when I ran my NTP server on a Raspberry >> Pi with the Adafruit breakout board (same as current hat). I list it >> because of the “fudge” line. This was commonly accepted as the proper fudge >> settings, especially for time2 - 0.350: > > How do we know this will be correct for the HAT? Is that fudge really > associated with the MTK3339 itself, independent of surrounding hardware?
I think it was more specific to the MTK339, because it was setting time2 (time from start of second to when the sentence came that provided rough/NMEA time). That’s been a long time ago, so I may not remember it so well. My references were: https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html <https://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html> https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=1970&start=80 <https://www.raspberrypi.org/forums/viewtopic.php?f=41&t=1970&start=80> >> server tock.usshc.com iburst >> server clock.isc.org iburst >> server tick.apple.com iburst > > What is special about these servers? There were reliable, GPS based servers that I trusted, that served from a GPS pool.
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