Title :
The Calibration of Amplitude Modulation Meters with a Heterodyne Signal
Author :
Macdonald, John R.
Author_Institution :
Texas Instruments Inc., Dallas, Texas
Abstract :
Errors which may occur in the calibration of peak or average reading amplitude modulation meters with a heterodyne signal are investigated in detail. Relations between the heterodyne-amplitude ratio M and the true modulation factor m of a sinusoidally modulated wave are derived. Using these results, heterodyne calibration of modulation analyzers to read m exactly can readily be carried out.
Keywords :
Amplitude modulation; Bridge circuits; Calibration; Correlators; Diodes; Distortion measurement; Filters; Frequency; RF signals; Signal analysis;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1954.274731
