Radiation hardened timer
Radio receiver
Re-entrant coaxial cavity power combiner
Redundant back-up PLL oscillator phase-locked to primary...
Redundant clock source
Redundant clock source
Redundant oscillator for clocking signal source
Reference vibration generator, its mutual synchronizing...
Reference-frequency-signal switching circuit
Ring oscillator having two rings whose outputs are combined
Ruggedized chip scale atomic clock