ISEE-3 Frequency Drift Measured

Based on the latest Horizons update by JPL (based on Arecibo observations) I have measured the frequency drift of the spacecraft TX frequency (transponder A RHCP). It appears to be drifting upward at a rate of 3.3 Hz per hour. Not bad for such an old spacecraft. This is unlocked carrier frequency measurement over a 3 hour period.

isee3_drift

Category(s): Spacecraft
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