Question about Atomic syncing for analog G's
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  1. #1
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    Question about Atomic syncing for analog G's

    Today a saw another video on youtube where a GPW1000 was time syncing next to a GWA1100.
    When the syncing was done I was expecting both watches to show the exact same time (the exact same position of the second-hands). This was not the case. In one of the watches the second-hand was off by nearly 25 seconds.
    Which watch has the right time? You would expect to believe the watch that just synced (in the vid the GPW1000). But I wasn't expecting another higher end G (the gw-a1100 in this case) te be so far off!! How come?

    If you sync two watches (G-Shocks) at the same time do they show the exact same time after syncing?

    I'm eagerly awaiting my first G and I'm just curious.

    I will be getting a GW-A1000fc orange. It's already a couple of days in the mail right now. I was hoping for delivery today but no luck this time.....luckily we have WUS

  2. #2
    Member Mike K's Avatar
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    Re: Question about Atomic syncing for analog G's

    I have NO idea why one of the watches in the video was off by 25 seconds.

    Quote Originally Posted by Crafft View Post
    If you sync two watches (G-Shocks) at the same time do they show the exact same time after syncing?

    I'm eagerly awaiting my first G and I'm just curious.
    I have eight atomic G's -- all digital -- and they DO show the exact same time after synching.

    I leave all of their "hourly chimes" on, and am consistently amused at how they all beep in perfect unison at 1 or 2 AM. A couple of them drift a half-second or so per day, so by noon the double beep is slightly out of synch and has become a triple beep, and by 9 or 10 o' clock at night it's a quadruple beep -- then midnight rolls around, they all synch, and they all beep simultaneously again!
    Kev55 and kandyredcoi like this.

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    Member yankeexpress's Avatar
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    Re: Question about Atomic syncing for analog G's

    Believe one watch did not actually complete it's sync cycle.
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  5. #4
    Member Kilovolt's Avatar
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    Re: Question about Atomic syncing for analog G's

    I own 18 radio controlled watches of 4 different brands (Casio, Citizen, Junghans, Seiko) and when they all receive the signal (not very often ...) they all show exactly the same time. The instruction manuals say that there might be a difference of 1 second after sync though.

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    Re: Question about Atomic syncing for analog G's

    I'd have to see the video, but was the GPW synched indoors? GPS receivers are subject to a phenomenon known as "multi-path error." GPS signal is transmitted from the spacecraft on orbit down to the user. If you are in an urban environment, you're not only receiving the original signal, but the signal bounces off of buildings, cars, etc. Since the signal is in the L-Band, it doesn't exactly power it's way through obstruction. In the GPS signal, it's all about timing. If there is even the smallest amount of delay between transmission of the signal and receipt (think nanosecond level differences), big errors manifest themselves. Many GPS receivers are designed to filter this out, but I doubt you'd see that on a watch that receives signal purely for the purpose of getting the correct time.

    So without seeing the video, I'd be willing to bet there is some multi-path error taking place. If both watches were synched outdoors away from obstruction, they'd probably show the same time.
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    Re: Question about Atomic syncing for analog G's

    Thanks for your answers.

    here's the link to te video:

  8. #7
    Member GeSte's Avatar
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    Re: Question about Atomic syncing for analog G's

    Quote Originally Posted by Crafft View Post
    Thanks for your answers.

    here's the link to te video:

    The orange GWA1100 was not shown to be syncing atomically at the same time?

    So naturally the times are different.
    nelamvr6 likes this.

  9. #8
    Member kandyredcoi's Avatar
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    Re: Question about Atomic syncing for analog G's

    curious. i will check my ana-G along side my digi-G and report back after tonights sync
    -Coi- instagram @kandyredcoi / Facebook

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    Re: Question about Atomic syncing for analog G's

    One is using GPS, signal from a satellite above the Earth. The other is using a radio signal from a tower on Earth. Two very different time sync mechanisms. This post above explained it pretty well for GPS ( https://forums.watchuseek.com/f17/que...l#post10457962 ). Radio sync is usually slower, takes minutes to finish the syncing.

  11. #10
    Member Derek N's Avatar
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    Re: Question about Atomic syncing for analog G's

    How do you know whether the orange watch was displaying the correct time to begin with? It does not appear to be in the sync process as the GPW. Therefore, I guess one can assume that the GPW is showing the correct time and the GWA is not?

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