Reduction of Phase Noise of Highly Stable Quartz Oscillators Under Vibration by Means of Cable Vibration Isolators

The influence of random vibration effects on the phase noise of quartz generators is examined. To reduce this noise, it is proposed to use a VI 0.8/0 cable vibration isolator. Experimental studies were conducted to evaluate the efficiency of vibration isolators along the X , Y , and Z axes. The results demonstrate a decrease in phase noise under various vibration modes. The results of the analysis of the effect of the spectral density of vibrations and resonant frequencies are presented, confirming the improvement of the frequency stability of quartz oscillators when using cable vibration isolators. As a result of measurements, it was found that the use of cable vibration isolators allows for a 15–30 % decrease in phase noise depending on the frequency range and direction of random vibration. Vibration isolators are most effective in the frequency range above 150 Hz for the X and Z axes, and above 300 Hz for the Y axis. The data obtained confirm that vibration isolators can significantly improve the stability of quartz oscillators under vibration conditions, starting from a certain frequency of action.