April 1970 | NTIA Technical Memo TM ITS 229

Apeak FM deviation calibrator graph

J. J. Tary; T. L. Livingston

Abstract: Use of a decibel plot for the Bessel function makes it a simple task to obtain the single tone peak deviation of FM radio systems. The procedure offers ways to calibrate deviation meters, supplement the carrier disappearance technique, and check the linearity of a generated FM spectrum. These curves are particularly useful in the low deviation range, where the carrier disappearance technique gives unsatisfactory results. The measurement technique described requires only "off the shelf” test equipment.

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