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Title: A More Accurate Method To Measure The Frequency Deviation Of The Modulated Signals With Modulation Index 0.2
Author: Yeou-Song Brian Lee
Source: 2005 Measurement Science Conference
Year Published: 2005
Abstract: The Bessel Null or Carrier Null method is the most accurate way to measure the frequency response of frequency-modulated sources. It is used to control deviation since frequency deviation is independent of the modulating frequency. The actual method of finding a null appears to be accurate and easy. The first null can be observed at the modulation index of 2.4. The subsequent indexes are larger than one. For modulation index less than one, a null is hard to be located. By numerical solving the Bessel Function and employing the spectrum analyzer, a simplified approach is ideal for accurately determining the frequency deviation. It is very similar to the narrowband solution for frequency modulation. In this paper, we would compare the results with the narrowband approach and by solving the Bessel functions in determining the accuracy of the frequency deviation.

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