[time-nuts] 60hz disciplined watch

[paul swed]

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.

On Wed, Apr 20, 2011 at 10:10 AM, jmfranke <jmfranke at cox.net> wrote:

> Do they detect the light flicker or the ambient ac field. Light flicker is
> 120 Hz.
>
> Very interesting,
>
> John  WA4WDL
>
> --------------------------------------------------
> From: "tom jones" <epoch_time at yahoo.com>
> Sent: Wednesday, April 20, 2011 9:43 AM
> To: <time-nuts at febo.com>
> Subject: [time-nuts] 60hz disciplined watch
>
>  Most if not all Citizen ecodrive watches are disciplined by 60hz light
>> flicker that average
>> the 60hz light flicker over approximately 10 days before a rate adjustment
>> is preformed.
>>
>> I have four citizen ecodrives;
>>
>> Plain jane quartz analogue ecodrive with mechanical calendar that is 60hz
>> disciplined.
>>
>> Stainless steel skyhawk ecodrive ana-digital that is 60hz disciplined.
>> I've monitored this one
>> for over a week it was holding  13 miliseconds for over a weeks duration
>> (off the wrist mode) compaired to my cesium and ribidium references and got
>> distracted from futher measurements of this citizen skyhawk as I was
>> consumed with other measurements and comparisons between loran gps cesium
>> ribidium and other watches.
>>
>> Blue angles citizen skyhawk ana-digital that half the time seems to be
>> 60hz disciplined and other times unsure.
>> This blue angles citizen skyhawk has the same movement as the stainless
>> steel skyhawk which is definately 60hz disciplined.
>> I suspect this blue angles skyhawk that I purchased out of the country
>> could have 50hz and 60hz dicipline modes?
>>
>> My fourth citizen ecodrive is the stars & stripes forever yacht timer
>> ana-digital which is 60hz diciplined.
>> This watch reboots every feb 28th at midnight to utc time zones and jan 1
>> 2004 (not sure of the exact year is crashes to) some kind of leap year bug!
>>
>> Only unexpected temperature changes experienced by the ecodrive citizen
>> watches produce significant error
>> (.5 to 1 second over several days of temperature varation) there rate will
>> correct after an approximate 10 day time constant.
>>
>> Many wrist watch forums make reference to citizen ecodrive rate accuratces
>> remarking that citizen uses some propriatary rate techniques. It's simply
>> 60hz light flicker received at the ecodrives solarbattery/photocell.
>>
>> I would recomend when setting your citizen ecodrive watches to set them
>> 2.5 to 3 seconds fast if worn continous because that is approximately how
>> much time will be lost before its rate gets compensated the first time.
>>
>> A Great Day to All , Tom
>>
>>
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>
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