[time-nuts] WWVB Disciplined Oscillator

[Wayne Holder]

> 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 <kevin at 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 <paulswedb at 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.holder at 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
> > > _______________________________________________
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>
>
> --
> Kevin Croissant
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