Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Quartz Watch Movement Replacement
    From: Greg Rudzinski
    Date: 2012 Jun 18, 15:53 -0700

    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

    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

    File:


       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site