On Fri, 28 Nov 2014, Ken G Kopp wrote: ...
Here's the most important info .... as of about a year ago the modulation scheme on WWVB (60 kHz) was changed (phase reversal each minute) and this has rendered most of the end-user equipment inoperative. Most (all ?) tracking receivers like the HP-117's are now useless without extensive modification. Most of the "atomic" clocks now in use ->do not<- synch to the current modulation scheme on the 60 kHz signal. This will explain the differences in displayed time on supposedly identical clocks and how some appear to not be getting sufficient enough signal to synchronize.
I heard from my time-nerd friends that the modulation scheme changes for a short period at night to allow a chance for older equipment to sync up. I don't know that for sure. Technology Review said there are millions of pieces of equipment that use the older scheme. -- Hisashi T Fujinaka - ht...@twofifty.com BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
