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

[Bill Notfaded]

Is this why so many really high end devices are basically dumped on eBay
now?  I wondered why SRS device was so cheap now considering price of the
SR620.  It's too bad they don't work anymore.  I'm sure when this happened
it was a HUGE let down to many here that were using them?  What's the best
modern one of these for metrology use?  Or has GNSS basically ended it?
I'm very interested in your knowledge about these because I've really
wondered how a modern one would compare to GNSS?

Thanks,

Bill

 .ılılı..ılılı.
notfaded1

On Sun, Oct 4, 2020, 2:54 PM paul swed <paulswedb at gmail.com> wrote:

> 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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