[time-nuts] WWVB Clocks don't sync anymore (revisited)

Herbert Poetzl herbert at 13thfloor.at
Wed Mar 20 11:31:04 EDT 2013

On Wed, Mar 20, 2013 at 11:22:46AM -0400, Chuck Harris wrote:
> The thing is, many of us on the opposite end of the country
> from WWVB have to rely on favorable propagation to make our
> clocks work reliably.  What happens if noon and midnight
> aren't favorable times?

Then you got a problem I guess :)


> -Chuck Harris

> Herbert Poetzl wrote:
>> On Wed, Mar 20, 2013 at 02:34:19AM -0400, Bill S wrote:

>>> Interestingly, I have three timepieces that will no longer
>>> synch to wwvb.Two Radio Shack digital clocks and a Casio
>>> wristwatch that I've worn for a couple of years and was always
>>> pretty much dead on. Like Paul, I have an analog Lacrosse clock
>>> that is running correctly. Nothing I've tried will make the
>>> other clocks synch.

>> Maybe this is related to the phase modulation time code
>> protocol used by WWVB since October 29th, 2012.

>> Their website also states that clocks using information
>> from the carrier will no longer work, and that during the
>> transition period (at least March 21st 2013), the PM
>> signal will be turned for for 30 minutes twice a day
>> (noon and midnight MST) so maybe check if the clocks
>> sync then?
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