Someone replied that it’s a quartz clock because it’s digital and therefore not getting its timing from mains. I certainly could have been wrong. I only assumed it was tied to mains frequency ...

One area of research pursued the realization of a microwave oscillator based on RF photonics. Oscillators are devices that produce periodic waves whose amplitude, phase and frequency can be ...

Frequency Electronics ... it has been awarded several significant contracts to supply specialized precision quartz oscillators, synthesizers, and receivers for aerospace programs.