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NTP sync! RTC time: 2024-04-24 18:22:47.4920 NTP time: 2024-04-24 18:22:47.492067 RTC time: 2024-04-24 18:22:47.4926 NTP sync! RTC time: 2024-04-24 18:39:52.5943 NTP time: 2024-04-24 18:39:52.591387 RTC time: 2024-04-24 18:39:52.5919 NTP sync! RTC time: 2024-04-24 18:56:57.6936 NTP time: 2024-04-24 18:56:57.690580 RTC time: 2024-04-24 18:56:57.6911 NTP sync! RTC time: 2024-04-24 19:14:02.7928 NTP time: 2024-04-24 19:14:02.790063 RTC time: 2024-04-24 19:14:02.7906 NTP sync! RTC time: 2024-04-24 19:31:07.8924 NTP time: 2024-04-24 19:31:07.889590 RTC time: 2024-04-24 19:31:07.8901 NTP sync! RTC time: 2024-04-24 19:48:12.9919 NTP time: 2024-04-24 19:48:12.988927 RTC time: 2024-04-24 19:48:12.9895 NTP sync! RTC time: 2024-04-24 20:05:18.0912 NTP time: 2024-04-24 20:05:18.088122 RTC time: 2024-04-24 20:05:18.0887 NTP sync! RTC time: 2024-04-24 20:22:23.1905 NTP time: 2024-04-24 20:22:23.187691 RTC time: 2024-04-24 20:22:23.1882 NTP sync! RTC time: 2024-04-24 20:39:28.2899 NTP time: 2024-04-24 20:39:28.287208 RTC time: 2024-04-24 20:39:28.2878

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Notices where this attachment appears

  1. Embed this notice
    Andrew Zonenberg (azonenberg@ioc.exchange)'s status on Saturday, 11-May-2024 03:51:30 JST Andrew Zonenberg Andrew Zonenberg
    in reply to

    Let the NTP firmware run over a few hours while having dinner and doing family stuff.

    It looks like the local oscillator on my MCU is just a tad fast relative to GPS time (the stratum 1 NTP source on my lab LAN).

    The polls are approximately 1024 seconds apart, and I'm running about 2.8 - 2.9 ms fast every time I re-sync the clock to NTP.

    Let's call this 2.85 ms of error into 1024 seconds, which comes out to about 2.78 ppm.

    Not bad considering i'm using a non-temperature-compensated quartz oscillator with a datasheet tolerance of +/- 25 ppm.

    In conversation about 7 months ago from ioc.exchange permalink
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