Now about those dead true-times. I am still looking for 1 or two to test with as I work on the WWVB d-PSK-r. I have shared one spectrcom solution with the group. And been working on a more universal costas loop answer. The loops seems to work nicely and has been operational over a two week period. Currently building a general purpose TRF front end for the loop. Johns put up with my emails through the year long process. Thanks. Regards Paul
On Sat, Feb 23, 2013 at 9:37 AM, J. Forster <[email protected]> wrote: > So, if you use phase-tracking hardware, it's good for three more weeks. > > Wonderful... not. :(( > > LORAN-C all over again! > > -John > > ================= > > > > On Fri, Feb 22, 2013 at 06:01:46PM -0500, paul swed wrote: > >> Donald from what I have been seeing they are consistent. > > > >> But there is a 1 hour period up around 1 or 2 pm est that > >> they go back to the old modulation and that allows time > >> clocks to lock. > > > > Just for information here (from their web page): > > > > Since October 29, 2012 at 1500 UTC (9:00 AM MDT), NIST > > Radio Station WWVB has been broadcasting a phase modulation > > (PM) time code protocol that has been added to the legacy > > AM/pulse-width-modulation signal. > > > > This enhancement to the broadcast, which has been tested > > throughout 2012, provides significantly improved performance > > in new products that are designed to receive it. > > > > Existing radio-controlled clocks and watches are not > > affected by this enhancement, and continue to work as before. > > > > Disciplined oscillator products that track and lock to the > > 60 kHz WWVB carrier and were designed to work as frequency > > standards, will not work with the PM signal and will now > > become obsolete. > > > > A few radio controlled clocks that used information from the > > carrier – specifically the Spectracom NetClock and receivers > > manufactured by True Time during the 1970s and 1980s – will > > no longer be able to read the time code and will also be > > obsolete. > > > > To allow users of these receivers to migrate to new products, > > the plan for implementing the new modulation protocol > > includes a transition period that will extend until at least > > March 21, 2013. > > > > During the transition period, the PM signal will be turned > > off for 30 minutes twice per day, at noon and midnight > > Mountain Standard Time (MST), allowing carrier tracking > > receivers to temporarily acquire the legacy signal. > > > > HTC, > > Herbert > > > >> At least thats what the spectracom 8170 does. Then it says > >> its locked for a very long time even though it isn't. > > > >> Regards > >> Paul > >> WB8TSL > > > >> On Fri, Feb 22, 2013 at 3:35 PM, Donald Henderickx > >> <[email protected]>wrote: > > > >>> Is wwvb consistent in the testing of there modulation scheme?I find > >>> that > >>> My Spectracom 8182 will stay in time sync for several days,and then > >>> loose > >>> it for five or six hours. Is any one else experiencing this? > >>> I am thinking of trying my kinemetrics/truetime 60-TF to see if it > >>> might > >>> function. > >>> Don Henderickx > >>> ______________________________**_________________ > >>> 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. > _______________________________________________ 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.
