Re: A puzzle with internet time and NIST time
On Tue, Oct 16, 2012 at 11:49:19AM -0400, Doug wrote:
>
> >>A receiver for WWVB at 60KHz that would decode the signals would be
> >>as accurate as anyone could want. That's the signal that your "atomic"
> >>clock receives, so the clock *should* be accurate. You might only be
> >>able to receive the signal in the nighttime hours, like the clock.
> >>Typically, the clock will sync up at about 2AM local time, and a WWVB
> >>receiver would basically do the same thing, with an accurate crystal
> >>oscillator as an internal reference to keep time when no signal is
> >>being received. Such a receiver would probably cost over $1000,
> >>at a guess, but that's the difference between a scientific reference
> >>and a $20 "atomic" clock!
> >Sorry, did you just suggest that the solution for the OP's problem with
> >a radio controlled clock is... a radio controlled clock?
> >
> A $1000 radio controlled clock--not a $20 one. As someone else suggested,
> it is likely that the radio receiver in the cheap clock is no longer
> functioning, and
> the crystal oscillator, which of necessity uses a cheap
> poor-tolerance crystal,
> is running on its own, and drifting off frequency.
>
Unplug / remove the battery of the wall clock for a while, then plug it
back in and see if it resets its time. That'll tell you if the receiver
is working.
-Rob
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