Citation
Abstract
Recent measurements performed on the superconducting cavity maser (SCM) oscillator show frequency stability in the range of 1015 for times from I sec to 1000 sec. Phase noise of approximately -80 dB/f3 was also measured. This shortto midterm performance appears to be better than that of any microwave oscillator. In particular, the measured stability at I-sec intervals is 10 times better than that of a hydrogen maser, and the phase noise at 8 GHz is more than 20 dB below that of the best multiplied quartz-crystal oscillators. A frequency pulling coil has been implemented and tested to enable the SCM to be slaved to a hydrogen maser at a time constant of approximately 50 sec. This combination will allow the longterm performance of the hydrogen maser to be improved by adding to it the newly available short-term performance of the SCM.
Details
- Volume
- 42-103
- Published
- November 15, 1990
- Pages
- 21–26
- File Size
- 279.3 KB