Stability and phase noise tests of two cryocooled sapphire oscillators

Author

Dick, G. John ; Wang, Rabi T.

Author_Institution

Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA

Volume

2

fYear

1999

fDate

1999

Firstpage

548

Abstract

A cryocooled compensated sapphire oscillator (CSO), developed for the Cassini Ka-band Radio Science experiment, and operating in the 7 K-10 K temperature range was previously demonstrated to show ultra-high stability of σ_y=2.5×10^-15 for measuring times 200 seconds ⩽τ⩽600 seconds using a hydrogen maser as reference. CSO-1 and CSO-3 are now both operational with new low noise receivers. We have made initial phase noise and Allan deviation measurements that show more than ten times stability improvement over the hydrogen maser for measuring times 1 second ⩽τ⩽10 seconds, and indicate performance for the individual units of σ_y≈3×10^-15 for measuring times from 10 to 1000 seconds. Phase noise is reduced by 20 to 28 dB over the design offset frequency range from 1 Hz to 40 Hz. Receiver design is also discussed

Keywords

compensation; cryogenic electronics; crystal oscillators; frequency stability; microwave receivers; phase noise; radiotelescopes; sapphire; 1 to 10 s; 1 to 40 Hz; 200 to 600 s; 7 to 10 K; Al₂O₃; Allan deviation measurements; Cassini Radio Science experiment; Ka-band; cryocooled compensated sapphire oscillator; low noise receivers; offset frequency range; phase noise tests; stability; Frequency; Hydrogen; Masers; Noise measurement; Oscillators; Phase measurement; Phase noise; Stability; Temperature distribution; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European

Conference_Location

Besancon

ISSN

1075-6787

Print_ISBN

0-7803-5400-1

Type

conf

DOI

10.1109/FREQ.1999.841364

Filename

841364