[time-nuts] Adafruit Ultimate GPS timing message arrival times

Bob Camp kb8tq at n1k.org
Mon Aug 1 14:45:38 EDT 2016


You very much are not *done* when you get your point at a million seconds. That’s
just where you get to *start* ….

Since you are talking about nearly two weeks per sample, there are a *lot* of things 
that could happen. If your loop needs ten samples to do much with, it will be 4 months
before anything at all happens. In that period, you need to wonder if the power will stay on 
for the whole time …. (thunderstorms in the area at the moment …)

Even if you back off to “I only need 1 ppm”, you still have a really slow process.


> On Aug 1, 2016, at 1:35 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> If I start with a serial string that is good to 10ms and my goal is 10 ppb,
>> I’m waiting for a  million seconds per sample.  
> That also assumes that the temperature isn't changing while you are 
> collecting the data.
> -- 
> These are my opinions.  I hate spam.
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