On 5/6/2017 1:10 PM, Bill Unruh wrote:
server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst


Those are there why? And why the iburst?

Because the system doesn't always have a sky view (so no PPS). iburst because is syncs faster and is included in every example.



refclock PPS /dev/pps0 lock NMEA refid PPS
# Setting for 2, 3, 4, 5, 10 updates per seconds

Huh? What kind of PPS do you have?

An onboard GPS.

210 Number of sources = 6
MS Name/IP address   Stratum Poll Reach LastRx Last sample
========================================================================
#* PPS                    0   4   377    12  -1506ns[-1838ns] +/-  395ns
#? NMEA                   0   4   377    12    -22ms[  -22ms] +/-  100ms
^- soft-sea-01.server     2  10   377    15  -1237us[-1237us] +/-  116ms
^- time-a.timefreq.bl     1  10   377   513  -1925us[-1928us] +/-   33ms
^- services.quadranet     3  10   377   502  -4440us[-4443us] +/-   82ms
^- 159.203.158.197        3  10   377   538   +181us[ +181us] +/-   99ms



# Enable kernel synchronization of the real-time clock (RTC).
rtcsync
Does it have an rtc at all?


Yes.  It is built into the GPS card.

https://www.adafruit.com/product/2324


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