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  • ddrown's Avatar
    08-29-2020, 04:58 PM
    You're correct, I've updated that example.
    31 replies | 1586 view(s)
  • ddrown's Avatar
    08-02-2020, 04:23 AM
    My two have a tempco of 0.154ppm/C and 0.206ppm/C, so that fits with your 0.195ppm/C. Wander being 0.005 ppm in an hour is pretty impressive.
    31 replies | 1586 view(s)
  • ddrown's Avatar
    07-31-2020, 03:51 AM
    Nice! Good idea with the cinderblock, that should add a lot of thermal mass
    31 replies | 1586 view(s)
  • ddrown's Avatar
    07-30-2020, 06:02 AM
    I'm curious why you assume the frequency changes are coming from the GPSDO and not from the Teensy's crystal. Could you explain why you suspect the one but not the other?
    31 replies | 1586 view(s)
  • ddrown's Avatar
    07-30-2020, 05:03 AM
    chisquare values are in counts (25MHz) so 42.9 counts = 1.7us. Those values look reasonable to me. I'm considering dropping old samples when the chisq value is high. This usually happens when the local clock is...
    31 replies | 1586 view(s)
  • ddrown's Avatar
    07-29-2020, 02:28 AM
    This code is only built as an NTP (not PTP) server. But I do have different code for the esp8266: https://github.com/ddrown/esp8266-clock It uses an NTP client to keep the local clock in sync, and displays the time...
    31 replies | 1586 view(s)
  • ddrown's Avatar
    07-24-2020, 03:08 AM
    I let this run for 5 days, and these are interesting results. I have two different Teensy 4.1 boards running this code. Temperature vs frequency over 256 second intervals: Just using a linear fit gives a...
    31 replies | 1586 view(s)
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Teensy 4.1 NTP server 08-29-2020 04:58 PM
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