[time-nuts] PLL/GPSDO/etc learning resources for mere mortals

[Mark Sims]

Besides temperature compensation for holdover conditions you should also include drift compensation for OCXO aging.   The Trimble GPSDOs,   HP 38xx and 53xxx GPSDOs, and Oscilloquartz Star-4 do this.  Oscilliquartz calls it ATDC (Automatic Temperature and Drift Compensation).   For many OCXOs the magnitude of the temperature and drift values are of similar importance in predicting holdover compensation corrections.

Teasing out and modeling the independent effects of temperature and drift can be quite a challenge in operational systems.