Burt Yes this has been looked at before by time-nuts and as you say it shifts. Its also documented by nist and unfortunately the AM code is nothing like the new psk code for a good reason. Better noise immunity and other things also documented. Its complex at least for me. Overall I get it but when I get to the error correction and disassembly of the message format its not so clear. Though perhaps it would be if I were building a psk decoder and that may happen later but only after the d-psk-r is really pretty complete. A by product of the d-psk-r is the psk code so its there for the taking. Regards Paul WB8TSL
On Fri, Jun 14, 2013 at 8:13 PM, Burt I. Weiner <b...@att.net> wrote: > Gang, > > I took a look at the WWVB signal using a 1:1 Lissajou signal the same way > I do for the FMT's. Using a 10:1 scope probe I sampled off the output of > the pre-amp in the 8170 and fed it into a HP-3586B tuned to 60 kHz and > compared the resultant I.F. against a HP-3336A tuned to the 15625 I.F. > Both the 3586B and the 3336A are GPS locked. I won't go into the nitty > gritties of how I do this, but f anyone's interested they can see my FMT > Methodology at: > http://www.k5cm.com/k6OQK%**20FMT%20NEW.htm<http://www.k5cm.com/k6OQK%20FMT%20NEW.htm> > > What I saw was the phase of the WWVB signal shifting back and forth 180 > Degrees coincident with the dips in the carrier. Coincidentally, this is > what all of you have been telling me, but, just the same, it was > interesting to watch. The duration of each shift obviously are a form of > zeros, ones and place holder. I'm wondering if the code used to shift the > phase is the same code as carried in the legacy system where the duration > of the carrier dips corresponds to the ones and zeros, and the place holder. > > Burt, K6OQK > > Burt I. Weiner Associates > Broadcast Technical Services > Glendale, California U.S.A. > b...@att.net > www.biwa.cc > K6OQK > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
