Close

Multi-day Performance

A project log for GPSDO Master Clock

A master clock source for the radio astronomy SDR DAS.

Robert RouquetteRobert Rouquette 07/01/2020 at 20:330 Comments

Here's the tracking performance over 93 hours.  The graphs demonstrate both the frequency drift over temperature and the much more gradual drift from aging.  The enclosure appears to sufficiently blunt the cyclic temperature changes, and the PID loop remains stable despite the offset jumps when the GPS recalculates its coordinate fix.  I plan to eventually move the antenna outdoors which should reduce the GPS fix errors.

Discussions