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-4×10−15 for integration times between 1 s and 10,000 s.
@article{arxiv.1004.0775,
title = {Stability measurements of microwave frequency synthesis with liquid helium cooled cryogenic sapphire oscillators},
author = {J. G. Hartnett and D. L. Creedon and D. Chambon and G. Santarelli},
journal= {arXiv preprint arXiv:1004.0775},
year = {2010}
}
Comments
11 pages, 8 figures, presented at the Joint conference of EFTF-IFCS, Besancon, France, 2009