[Elecraft] OT: Changes at WWV, WWVB

[david Moes]

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.
dmoes at 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.
>