I recieved a new la Crosse clock about two months ago In the
instructions it stated that it would only sync a a specific time at
night. And now I know why.
David Moes
President: Peterborough Amateur Radio Club.
dm...@nexicom.net
VE3DVY, VE3SD
On 11/28/2014 18:40, Hisashi T Fujinaka wrote:
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.
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