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3dB Bandwidth of FM Signal

Question asked by helemetry on May 11, 2011
Latest reply on May 13, 2011 by xmo
Hi,
When measuring the 3dB BW of an FM signal, does one choose the points 3dB below the center frequency, or the points 3dB below the peaks? In a high FM deviation signal, the center frequency is suppressed and the tallest points are closer to the edges of the band. In the attached spectrum, do I use the pink points or the green points to measure my 3dB BW?

Thanks for your help,
Helen  

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