>From the WWVB web page <http://www.nist.gov/pml/div688/grp40/wwvb.cfm> :
Enhanced WWVB Broadcast Format Change Since October 29, 2012 at 1500 UTC (9:00 AM MDT), NIST Radio Station WWVB has been broadcasting a phase modulated (PM) time code that has been added to the legacy AM/pulse-width-modulation signal. This enhancement to the broadcast, which has been tested throughout 2012, provides significantly improved performance in new products that are designed to receive it. Existing radio-controlled clocks and watches are not affected by this enhancement and continue to work as before. Disciplined oscillator products that track and lock to the 60 kHz WWVB carrier and were designed to work as frequency standards, will not work with the PM signal and have become obsolete. Radio-controlled clocks that are based on synchronous AM demodulation (lock to the carrier), such as the Spectracom NetClock and receivers manufactured by True Time during the 1970s and 1980s, have also become obsolete. For more information, contact Broadcast Manager John Lowe: <mailto:john.l...@nist.gov> john.l...@nist.gov or 303-497-5453. -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of cdel...@juno.com Sent: Wednesday, February 18, 2015 10:14 AM To: time-nuts@febo.com Subject: [time-nuts] WWVB receivers obsolete!? Am I wrong or are all the older WWVB frequency standard receivers obsolete? My understanding was that since the transmitted format changed the receivers wont lock. I asked an eBay vendor about that since they are still asking big bucks. The reply was "Ive heard that before, but certain people still use it, and need replacement for there though it is technically obsolete." I know the ones with internal standards can at least be used as a stand alone Quartz standard but what can you do with ones like the 8163 that have no standard? Cheers, Corby _______________________________________________ time-nuts mailing list -- <mailto:time-nuts@febo.com> time-nuts@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
