local clock sync or SDR ppm out of spec, messages

Discussion in 'Feeding' started by john, Oct 7, 2022.

  1. john

    john Member

    Each day I seem to get between 2 and a dozen or so messages about the clock not synchronizing. Except for one of these messages, they seem to appear in pairs about a minute apart, one up, one down.

    Oct 07 06:51:51 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: -621
    Oct 07 06:52:21 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 619
    Oct 07 07:32:54 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: -624
    Oct 07 07:33:24 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 621
    Oct 07 08:35:58 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 832
    Oct 07 12:55:18 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: -657
    Oct 07 12:55:48 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 656
    Oct 07 13:35:21 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: -640
    Oct 07 13:35:51 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 638
    Oct 07 14:01:53 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: -787
    Oct 07 14:02:23 adsbx readsb[453]: SDR ppm out of specification (could cause MLAT issues) or local clock jumped / not syncing with ntp or chrony! ppm: 788

    Is this a problem? Any ideas on how to fix it? I'm running the ADSBexchange image. 7.2.

    Thanks! ....John
     
  2. wiedehopf

    wiedehopf Administrator Staff Member

    That's probably harmless.

    Try updating via the webinterface, see if it changes anything.