Calibration of an oscillator-noise-measuring system

The calibration of an oscillator-noise-measuring system has been a problem, chiefly when the f.m. component of oscillator noise was measured. One of the best methods for such a measurement is the correlation method. Using a spectrum analyser, the correlation-function spectrum of the f.m. noise component can be obtained. By the described procedure, the original spectrum of the f.m.-noise component can be calculated.