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A Frequency-Modulation Monitoring System

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1 Author(s)
Pieracci, R.J. ; Formerly Graduate Assistant, Ohio State University, Columbus, Ohio. Now, Collins Radio Company, Cedar Rapids, Iowa

In operation of a frequency-modulated station it is necessary to monitor the frequency deviation accurately so that the signal remains within the allocated band. This is important from the standpoint of adjacent-channel interference and the distortion produced in a receiver when the frequency devsation exceeds the limits of the detector. This paper presents an analytical discussion and computed charts of the spectra produced by frequency-modulated waves. A monitor which plots the amplitude and frequency distribution of the spectrum on the screen of a cathode-ray oscilloscope is described and calibration of the monitor is discussed. Photographs taken from the screen of the monitor are presented and compared with computed patterns.

Published in:

Proceedings of the IRE  (Volume:28 ,  Issue: 8 )

Date of Publication:

Aug. 1940

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