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My experience with NTP service is that you need to keep it active. If you
let it set the clock on the Rpi and then keep running without the internet
connection the time on the clock gets pretty far off quite quickly. Like one day
later it is way off.
Budd WB7FHC
From: John D Hays - K7VE
Sent: Wednesday, December 26, 2018 5:34 PM
Subject: Re: [udrc] Setting up auto time with draws
gps As has been discussed
previously. NTP services like chrony slowly adjust the system clock based
on information obtained from both ntp servers and refclocks (like the GPS and
PPS).
Basil has created a script
that verifies time at ~/n7nix/gps/verify_time.sh
The command line to do a quick
update of the clock is: sudo chronyc makestep
You can verify your clocks
with: chronyc sources -v
The battery backed RTC in the
GPS must be set by the GPS once it has acquired the time reference from the
satellites.
In my opinion, NTP time
synchronization works best if the computer is not powered down and the Raspberry
Pi is well suited to continuous operation at low power consumption. With
the computer running continuously the chrony daemon can keep the system clock
well synchronized whether using the GPS/PPS and/or network connections.
(It ignores sources that are not reporting or are way out of
sync.) On Wed, Dec 26, 2018, 16:16 Art - KC7SDA <nouse4anick@...
wrote:
i think you have to have the battery installed for the rtc.... it takes a bit to get the signal and then set the clock.
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