Effect of vibration on s.a.w.-oscillator noise spectra

The detailed phase noise power spectrum of a 97 MHz s.a.w. periodic-grating oscillator (p.g.o.) driving a 96-times multiplier has been measured in the vicinity (0¿20 kHz) of the 9.3 GHz carrier. The noise spectra of the p.g.o. were measured under quiescent and random vibrational conditions. The experimental s.a.w. oscillator is shown to be completely immune to vibration, whereas a well developed crystal v.c.x.o. at the same frequency shows a dramatic increase in noise when subjected to vibration.