[time-nuts] Kinemetrics/Truetime WWVB model 60-dc?

paul swed paulswedb at gmail.com
Sat Apr 30 03:09:06 UTC 2016


Rob
Won't work they are phase tracking receivers and wwvb introduced bpsk
modulation.
Thats why they do not work.
Search time-nuts for d-psk-r and you see the various approaches I have used
to make those types of clocks useful.
Sorry no kits just answers.
Regards
Paul
WB8TSL

On Fri, Apr 29, 2016 at 7:12 PM, Rob Seaman <seaman at noao.edu> wrote:

> Howdy,
>
> We’re in the process of upgrading our telescopes in various ways,
> including deploying spiffy new GNSS clocks. While rummaging around the
> shelves of old equipment, I came across the WWVB time code generators that
> had been retired themselves a dozen years ago or more (in favor of NTP
> and/or GPS equipment). These are Kinemetrics/Truetime model 60-dc. They
> appears to power up ok to the point of displaying the colons and flickering
> keep-alive LEDs (see p.51 of http://www.to-way.com/tf/60dc.pdf). It would
> be cool to bring them back to life, if only to serve as retro wall clocks.
>
> It turns out the old 60 KHz antenna (same manufacturer, model A-60FS) was
> still mounted on the building, but I wasn’t able to get either of the two
> devices to lock when connected to it. The antenna had been repaired at some
> point, so I have no confidence that it's still in working condition after
> many years out in the weather after the case had been opened.
>
> Now I’ve come across this notice from Spectracom:
>
>
> http://spectracom.com/sites/default/files/document-files/Pending%20Changes%20in%20the%20WWVB%20Radio%20Signal%20Affects%20Precision%20Frequency%20and%20Timing%20Reference.pdf
>
> which suggests that other vendors’ devices might also "no longer operate
> as intended as a result of the WWVB signal change” after July 2012.
>
> If so, bummer!
>
> If not, suggestions for acquiring a functioning antenna?
>
> Many thanks for any information on these or similar devices. I should note
> that another telescope elsewhere on the mountain appears to still be using
> a Datum model 9100 (via Forth software!) nightly (though with WWV, not
> WWVB?)*  Does anybody have a manual for that unit?
>
> Rob Seaman
> University of Arizona
>> * there were even some IRIG wall clocks
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