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The Calibration of Amplitude Modulation Meters with a Heterodyne Signal

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1 Author(s)
J. Ross MacDonald ; Texas Instruments Inc., Dallas, Texas

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.

Published in:

Proceedings of the IRE  (Volume:42 ,  Issue: 10 )