Rob, Take a look at http://www.maxmcarter.com/rubidium/2012_mod/#599
Might be a possible mod. Bob darby -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Rob Seaman Sent: Friday, April 29, 2016 7:13 PM To: Discussion of precise time and frequency measurement <[email protected]> Subject: [time-nuts] Kinemetrics/Truetime WWVB model 60-dc? 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
