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Stability measurements of microwave frequency synthesis with liquid helium cooled cryogenic sapphire oscillators
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Stability measurements of microwave frequency synthesis with liquid helium cooled cryogenic sapphire oscillators
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We report on the evaluation of microwave frequency synthesis using two cryogenic sapphire oscillators developed at the University of Western Australia. A down converter is used to make comparisons between microwave clocks at different frequencies, where the synthesized signal has a stability not significantly different from the reference oscillator. By combining the CSO with a H-maser, a reference source of arbitrary frequency at X-band can be synthesized with a fractional frequency stability of sub-$4 \times 10^{-15}$ for integration times between 1 s and 10,000 s.
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