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The phase noise and frequency stability measurements of 1 GHz, 100 MHz, and10 MHz signals are presented which have been synthesized from microwavecryogenic sapphire oscillators using ultra-low-vibration pulse-tube cryocoolertechnology. We present the measured data using independent cryogenicoscillators for the 100 MHz and 10 MHz synthesized signals, whereas previouslywe only estimated the expected results based on residual phase noisemeasurements, when only one cryogenic oscillator was available. In addition wepresent the design of a 1 GHz synthesizer using a Crystek voltage controlledoscillator phase locked to 1 GHz output derived from a cryogenic sapphireoscillator.

Comparison of ultra-stable radio frequency signals synthesized from independent secondary microwave frequency standards