[time-nuts] Designing an embedded precision GPS time

Bob kb8tq kb8tq at n1k.org
Tue Oct 31 22:30:35 EDT 2017


Under what conditions would you expect to loose GPS? I seem to be able to 
do just fine sitting in an armchair here in the family room. That’s hardly a 
fancy setup.


> On Oct 31, 2017, at 10:27 PM, MLewis <mlewis000 at rogers.com> wrote:
> I'm intending to add a "precision" (well, precision to the Pi world) RTC to my Pi 3 to use for a holdover source when it hasn't got PPS from the GPS module.
> On 31/10/2017 10:04 PM, Chris Caudle wrote:
>> On Tue, October 31, 2017 7:19 pm, MLewis wrote:
>>> ...the "better" quality RTCs seem to be DS3231 based
>>> How does one translate that into an expected 24 hour holdover?
>> For the RTC, or for an NTP server?  If the NTP server is running it will
>> not make a difference, modern operating systems do not use the RTC for the
>> system clock, only to get close to the correct time at startup.
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