[time-nuts] WWVB remodulator for the Spectracom 8170...

paul swed paulswedb at gmail.com
Mon Jun 17 20:46:06 EDT 2013


Good conversation and the purpose of the remodulator is simply time.
The tuning fork sets the accuracy. Granted as mentioned in the earlier
email you can use a better reference but its not really a reference.
Thats why the d-psk-r exists it indeed corrects the phase error but is more
complex as it has to be. The d-psk-r has no problem at all feeding the data
into the remodulator.
Its just one of those have not gotten to it yet.
Will upload pix tonight we had a big Tstorm go through.
Regards
Paul
WB8TSL


On Mon, Jun 17, 2013 at 6:20 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> I suspect it will be a while before we see a phase locking / phase
> comparing receiver chip that works with the new modulation. I'd bet on them
> simply putting out the demodulated data. Since that chip just tells me what
> time it is, I don't see a lot of benefit in having one.
>
> Even if I can't demodulate *all* the bits, I can demodulate most of the
> bits. I know which slots are which. A good job of phase comparison can be
> done with just the recoverable bits. I'd still rather see a definition of
> the format that's not marked "preliminary" before moving down that road.
>
> Bob
>
> On Jun 17, 2013, at 6:03 PM, Chris Albertson <albertson.chris at gmail.com>
> wrote:
>
> > Yes the simple "re-modulator" fixes the time of day display but leaves
> the
> > frequency output about as good as the tuning fork crystal.
> >
> > I think the ONLY way to make it work 100% like new is to build a new
> > receier that actually decodes the phase inversions and "knows" when the
> > carier phase is flipped.   Thenit can "un-flip" the carrier.    There is
> no
> > way to predict some of the bits, you just have to detect it in real time.
> > You can verify the scheme is correct because the counter will increment
> > each second.  So the radio can know which phase is up and which is down.
> >
> > Until they sell one-chip WWVB chips using the new encoding it may not be
> > worth in except for those who don't trust GPS and want WWV as a backup.
> >
> >
> > On Mon, Jun 17, 2013 at 2:08 PM, Charles P. Steinmetz <
> > charles_steinmetz at lavabit.com> wrote:
> >
> >> Burt wrote:
> >>
> >> In a sense you could say that Paul's circuit does get the WWVB signal to
> >>> the receiver - it's just a new phase stable version of the signal
> signal.
> >>> This way I don't have to mess with the insides of the 8170.
> >>>
> >>
> >> Note that the 1 MHz TTL signal on the rear panel of the 8170 will not be
> >> phase locked to the WWVB carrier -- it will be phase-locked to the 60
> kHz
> >> carrier supplied by the re-modulator's crystal oscillator.
> >>
> >> One might try to injection-lock the re-modulator's crystal oscillator to
> >> the WWVB carrier, but presumably the PSK would work against you here.
> >>
> >> Best regards,
> >>
> >> Charles
> >>
> >>
> >>
> >>
> >> ______________________________**_________________
> >> time-nuts mailing list -- time-nuts at 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.
> >>
> >
> >
> >
> > --
> >
> > Chris Albertson
> > Redondo Beach, California
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


More information about the time-nuts mailing list