NavList:

Bill,

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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