Issue is any system that phase locked will not and then not decode Mobile so can't go into detail Paul Wb8tsl
On Thursday, January 17, 2013, Clint Turner wrote: > At about the time WWVB announced switching the format, two of my clocks - > identical "SkyScan" units bought at about the same time 10 or so years ago > suddenly stopped synchronizing, too. If just one of these clocks had a > problem, I would chalk it up to a random failure - but two of them? > > One of these clocks is in my ham shack, next to a different model clock > (one displays UTC, the other local) and this other clock hasn't missed a > beat while the other is on the wall, well away from any noisemaker like a > switcher or a CFL. I've actually swapped these clocks and neither one is > happy. I've also put a different brand clock in its place and it maintains > synchronization just fine. > > I've checked for noisemakers (switching supplies) and found a noisy one - > and then quieted it down with added filtering, but even before I did this > it hadn't affected a clock only a few feet away from it! > > The *only* time that these clocks lock up is when I first install the > battery, but from then on they claim to be locked, but are drifting away > from proper time. > > For one of these, I popped the cover and found the trace with the WWVB > time code from the die-mounted receiver chip and it looks pretty clean: No > "stuttering" is apparent, but I didn't make any attempt to time every type > of mark or space to verify its timing. > > The fact that it synchronizes just once is puzzling - as is the fact that > just this particular model is now unhappy: Was even a minor change made to > the AM portion of the code? I could imagine that a too-narrow bandpass > filter could slightly affect the timing of the pulses as the phase flipped, > but even if this were the case, why does it always synchronize just the one > time and then never again? > > 'Tis a puzzlement... > > 73, > > Clint > KA7OEI > > > > J.L. Trantham wrote: > >> I have two 'cheap' WWVB 'Atomic Clocks', both of which say they are >> 'locked' >> and are about 2 minutes apart. >> >> Joe >> > > > ______________________________**_________________ > 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.
