[time-nuts] Spectracom 8161 "Standard Frequency Receiver - Oscillator" for WWVB (and question...)

[paul swed]

Agree with Bobs comment. The 180 degree phase flip killed all of the gear
unless significant mods are done or the d-psk-r is used. Great old boxes
though.
Regards
Paul
WB8TSL

On Sun, Oct 4, 2020 at 3:15 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> This is another of the many devices out there that pre-date the
> “modern” 180 degree phase modulation approach on WWVB. Getting
> one of these to run properly with the new modulation approach would take
> some major mods …..
>
> Bob
>
> > On Oct 4, 2020, at 10:23 AM, Magnus Danielson <magnus at rubidium.se>
> wrote:
> >
> > Hi,
> >
> > I got a bit curious, so I dug up the manual (Available from Orolia that
> > Spectracom is part of):
> >
> >
> https://www.orolia.com/sites/default/files/document-files/8161_manual.pdf
> >
> > It is apparent that the reference oscillator is actually free-running
> > but compared to the WWVB, so you manually tune it to make the
> > strip-chart become more of a flat line.
> >
> > This is interesting, because the receiver locks up another 10 MHz
> > oscillator.
> >
> > Now, there is a 45 degree (2.1 micro) modulation on the WWVB signal,
> > that shows up as time-tags on the strip-chart, so it is not trivially so
> > that you just replace the simpler 10 MHz oscillator with the more
> > advanced, unless you can live with that modulation at which time it is a
> > fairlly trivial hack. You can be a bit more cunning to add hardware to
> > compensate the modulation, but I wonder if that is what is done.
> >
> > To figure it out, one has to pop the lid to figure out. That is however
> > not for me to do.
> >
> > Anyway, I thought the manual pointer and quick analysis would maybe be
> > appreciated.
> >
> > Good luck!
> >
> > Cheers,
> > Magnus
> >
> > On 2020-10-04 09:37, Kirk Bailey wrote:
> >> I ran across an interesting widget in my ongoing "find the bottom of the
> >> pile" task.  Has a label indicating it was modified for "WWVB Continuous
> >> Monitored".  I thought these were all for WWVB, so what does "Continuous
> >> Monitored" mean?  See attached pic.  If anyone is interested in being
> the
> >> new owner please contact me directly.
> >>
> >> Thanks,
> >>
> >> Kirk Bailey
> >> bailey at peak.org
> >>
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