Best practices question
hmurray at megapathdsl.net
Wed Jun 26 09:35:47 UTC 2019
> I've been tracking this and to my knowledge there are no makers of
> high-precision WWVB receivers left, following the modulation change in 2012.
> You can get "atomic clocks" that do the AM part of the signal, but they have
> only 1-second resolution. They don't unpack the subsecond PM information.
You can get better that 1-second timing even if the on-air format doesn't
provide it. Consider a typical PPS from a GPS. No sub-second bits, but you
can clearly get good timing.
The same thing happens with the typical battery backed RTC/TOY clock. You can
only read to a second, but if you poll the register with the low order second
bits you can get close to a second when they change. Or get an interrupt.
These are my opinions. I hate spam.
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