EFFECTS OF TAPE FLUTTER ON NOTCH NOISE LOADING TEST PERFORMANCE OF PREDETECTION RECORDING OF A FREQUENCY MODULATED CARRIER

Abstract

IRIG Document #L18-71 “Test Methods for Telemetry Systems and Subsystems” lists the notch noise loading test for establishing a figure-of-merit for frequency division systems. This paper reports measured effects of tape flutter on notch noise test data on pre-detection tape recorded FM carriers. The effects are explained on the basis of spectra of the output of the FM demodulator. The principal effect is to reduce the measured noise power ratio, NPR, in those notches at the low end of the baseband which overlap the flutter spectrum. The effect of tape flutter on FM/FM systems is reviewed.