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Frequency-Domain Measurement of the Frequency Stability of a Maser Oscillator

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3 Author(s)

In this paper we present a direct measurement of the spectral density of both the fractional frequency fluctuations and the phase fluctuations for a rubidium (Rb) maser oscillator. A truncated polynomial is fitted to each independent set of data obtained over a Fourier frequency range between 0.1 Hz and 100 Hz. They are Sy(f) = 1.9 ×10-25f-2 + 3.4 × 10-27f2 and S¿ = 1.2 × 10-5f-4 + 1.9 × 10-7f0, respectively. A random walk of frequency noise is dominent for frequency below 2.8 Hz while a white phase noise is dominent for the higher frequency range. These results are used to predict time-domain measurements which are then compared to experimental values.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:29 ,  Issue: 2 )

Date of Publication:

June 1980

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