Hi So far all the WWVB stuff is running here. That includes my Casio wristwatch. I admit that this thread convinced me to actually check it….
Bob On Mar 20, 2013, at 2:34 AM, Bill S <[email protected]> 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. > > Bill_S > W2FMA > > On 3/19/2013 5:29 PM, paul swed wrote: >> Funny you bring this up. I am just noticing a sharp clock that I always use >> and it has been accurate. But it did not flip with the time change this >> time and though it says its locked its off by 45 seconds slow. Yet a >> lacross clock across the room seems to be on second wise but never flipped >> with the time change. >> As I say its just becoming apparent. >> Regards >> Paul >> WB8TSL >> >> On Tue, Mar 19, 2013 at 4:55 PM, Clint Turner <[email protected]> wrote: >> >>> A few weeks ago I posted a question/comment about some of my WWVB-based >>> "Atomic" clocks no longer setting themselves properly. These two clocks, >>> SkyScan #86716, would show the symbol indicating that they had set >>> themselves, but their time was drifting away from UTC. Interestingly, they >>> *would* set themselves exactly once upon installation of the battery, but >>> never again. >>> >>> Since that time, I've done a bit of digging around. >>> >>> The first suspicion was that, perhaps, the NIST had fudged a bit in the >>> WWVB timecode recently, so I manually decoded a few frames and analyzed >>> them: Nothing suspicious there. >>> >>> The next question was if the addition of the BPSK somehow skewed the >>> timing of the TRF's AGC/threshold - but logically, this didn't make sense >>> since the clock *did* set itself exactly ONCE - and it wouldn't have been >>> able to do this at all were this the case. Out of curiosity I poked around >>> on the board and found the trace containing the time code and found that >>> despite the BPSK, its timing was exactly as it should have been: No >>> surprise there. >>> >>> This left the clock itself, so I did what any other Time Nut would do: I >>> built a WWVB simulator. >>> >>> Initially, I set it to a 2010 date - a time that I knew that the clock >>> worked properly. I had two clocks: One that I'd just reset by pulling and >>> replacing the battery while the other had been "stuck" for a few weeks, not >>> resetting itself nightly as it should. I put both of these in the coupling >>> loops from my WWVB simulator and over the next few days, the recently >>> re-set clock happily synchronized itself while the other one with the 2013 >>> date was still "stuck." I then reset that clock and it, too, behaved >>> itself from then on. >>> >>> I then reset the clock on the simulator to a February 2013 date and time. >>> Initially, both clocks reset themselves to the current time and date at >>> their next midnight, but after that, they got "stuck", never resetting >>> themselves at "night" again. >>> >>> So, it appears to be a problem with "Broken Sand" (e.g. a silicon problem). >>> >>> For the morbidly curious, I have documented my efforts here: >>> >>> http://ka7oei.blogspot.com/**2013/02/did-nist-break-bunch-**of-radio.html<http://ka7oei.blogspot.com/2013/02/did-nist-break-bunch-of-radio.html>- >>> The initial testing >>> >>> http://ka7oei.blogspot.com/**2013/03/yes-nist-did-break-** >>> bunch-of-radio.html<http://ka7oei.blogspot.com/2013/03/yes-nist-did-break-bunch-of-radio.html>- >>> The testing with the WWVB simulator >>> >>> 73, >>> >>> Clint >>> KA7OEI >>> >>> ______________________________**_________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to https://www.febo.com/cgi-bin/** >>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
