[time-nuts] 60hz disciplined watch

[cook michael]

Le 20/04/2011 16:17, John Ackermann N8UR a écrit :
>
> I wonder if it's smart enough to have a sanity check to determine 
> whether the line frequency is 50 vs. 60 Hz?
>
> BTW -- I have an Ecodrive watch, but it's radio controlled (as well as 
> solar charging), so haven't seen any reference to this setting method 
> before.
>
> John
> ----
>
> On 4/20/2011 10:13 AM, paul swed wrote:
>> My bet would be flicker and divide by 120. Doesn't really matter. But 
>> since
>> these watches use the light to charge the battery, sensing the 
>> frequency is
>> a byproduct. Nice and simple.
>>
I don't buy it. Makes a nice urban myth though. Incandescent sources 
don't flicker like fluorescent sources and the Skyhawk user manual does 
not recommend charging in front of flouresecent tubes to maintain accuracy.