Microwave interrogation system for VNIIFTRI cesium fountain

The input signal of the system is 5 MHz with a high long-term stability. 5 MHz quartz crystal oscillator of improved short-term stability (~2·10^-13/1sec) is phase-locked to the input signal and controls, in turn, 1530 MHz oscillator. The 6-th harmonics of 1530 MHz signal forms 9.180 GHz interrogation signal. As essential point of developed system is that the H-maser of increased output power (~1·10^-12 W) is used for further lowering of interrogation signal phase noise.