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    Re: Quartz Watch Movement Replacement
    From: Greg Rudzinski
    Date: 2012 Jun 18, 15:53 -0700


    To time to the tenth of a second is best done directly with the shortwave and split/stopwatch. There is a fractional delay when using non video still camera images. The camera clock is only + 0.5 seconds precision or so where the stopwatch is good to a hundredth of a second. Your video technique should be good to 3/100 of a second if everything is synchronized.

    Greg Rudzinski

    [NavList] Re: Quartz Watch Movement Replacement
    From: Bill B
    Date: 18 Jun 2012 16:22
    On 6/18/2012 12:14 PM, Greg Rudzinski wrote:
    > After three days the new ETA 805.121 quartz movement is still spot on :)

    How do you determine "spot on" over a three-day period?"

    I have been chasing the sub-second differences between NIST computer
    display, RCC, GPS and watch with some interesting (and surprising) results.

    After considerable research I purchased a Kaito KA11 radio (small and
    reasonably priced) to receive the WWW time broadcasts. I also use the 30
    fps video mode on my point-and-shoot digital camera to capture 2 devices
    simultaneously and count frames for difference. (Example: watch or RCC
    against computer screen.)

    Bill B

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