> Hi Wayne, > Great to see you found my presentation! > The paper is available here: > https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf
Kevin, thanks for the link to the paper. I'd like to know more about how correlation works and how you were able to use to to sync with the WWVB bitstream. From what I read in your paper, I'm guessing that the "local" code you use for correlation is generated by prediction once the receiver has locked on the broadcast code and these two bit streams are then "compared" in some way via multiplication... But, I don't really understand how this is done at a practical level as it would seem that his would require multiple passes over the code with some type of sliding time offset that advances with each pass? Or, are there simpler techniques? Can you suggest a reference where I can learn more? BTW, for everyone else following the WWW/WWVB/WWVH defunding saga, a post on this web page: http://cqnewsroom.blogspot.com claims that "*Congress has restored full funding for WWV, WWVB and WWVH, despite a budget proposal from the National Institute of Standards and Technology to shut down the three standard time and frequency radio stations. The Consolidated Appropriations Act of 2019 included some $725 million for NIST's Scientific and Technical Research and Services (STRS), the budget category that includes the stations' funding, according to NIST Public Affairs Director Gail Porter. The conference report accompanying the budget bill notes that "(t)he agreement rejects the proposed terminations and reductions for all STRS programs" and includes "not less than fiscal year 2018 funding" for several services, including "Time and Fundamental Measurement Dissemination."* The article then adds: *"With the shutdown threat ended, preparations continue for marking WWV's centennial this fall. According to the ARRL Letter, the Northern Colorado Amateur Radio Club will be operating a special event station from the WWV transmitter site from September 28 through October 2, using the callsign WW0WWV."* Wayne Wayne Wayne On Sat, Apr 6, 2019 at 9:00 PM Kevin Croissant <ke...@kevincroissant.com> wrote: > Hi Wayne, > > Great to see you found my presentation! > The paper is available here: > https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018_paper.pdf > I traveled to CO and met with NIST people there and gathered more data > then. We're planning to put out another paper soon (I'm finishing up my > bachelor's right now so I'm a bit preoccupied though). > I think LF timing is still very relevant in this day and age, and WWVB > still shows promise as a national timing source. > > Let me know if you have any questions. > Best, > Kevin > > On Sat, Apr 6, 2019 at 10:00 PM paul swed <paulsw...@gmail.com> wrote: > > > Wayne good read on the paper. > > All of the spectracoms and such were rendered useless by the new BPSK > > modulation. Though now that 5 years or so have passed not so new. Unless > > the modulation is accounted for they can't track the carrier. There are > > external modifications and other approaches that have been suggested. I > > have design and tested numbers of them with a final approach using the > > cheat'n d-psk-r. Won't go into that as its been shared here on time-nuts > > enough. A lot depends on your location and signal strength. Clearly > taking > > advantage of the new modulation for carrier prediction has advantage. But > > the fact is even I am now spoiled by GPSDOs. > > I also built a far simplere approach called a remodulator for simply > > allowing the spectracoms to get time. They are nice displays. Not sure > you > > can get even those piece parts any longer. > > Regards > > Paul > > WB8TSL > > > > On Sat, Apr 6, 2019 at 8:00 PM Wayne Holder <wayne.hol...@gmail.com> > > wrote: > > > > > Perhaps this has been mention before, but I found the following > document > > > while researching some details on WWVB and thought it might interest > the > > > group: > > > > > > https://www.kevincroissant.com/WWVB/WWVB_PTTI_2018.pdf > > > > > > I know that Spectracom once made a WWVB Disciplined Oscillator in the > > form > > > of the Model 8164, but I figured that this approach probably was > obsolete > > > in the era of GPS and network-based time. However, the author seems to > > have > > > produced some interesting results. Has anyone else built, or tried to > > > build a WWVB Disciplined Oscillator? > > > > > > Wayne > > > _______________________________________________ > > > time-nuts mailing list -- time-nuts@lists.febo.com > > > To unsubscribe, go to > > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > > and follow the instructions there. > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > > > -- > Kevin Croissant > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.