NASA NTRS · 19700000596
System automatically tunes hydrogen masers
Abstract
Automatic tuning system permits frequency synchronization between two hydrogen masers. System matches spaceborne clock performance with that of ground-based clock to test red shift theory. This system, used in conjunction with radio astronomy for long-baseline interferometer experiments, serves as a tool for investigation of distant universe phenomena.
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Levine, M. W., Vessot, R. F. C.. 1970-11-01. System automatically tunes hydrogen masers. https://ntrs.nasa.gov/citations/19700000596
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