Can multiple FM signals be accurately measured using a traditional wattmeter?

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When multiple FM signals combine, their waveforms can momentarily add and subtract, creating amplitude variations (an AM-like effect). Traditional wattmeters are not designed to accurately account for these rapid amplitude fluctuations. Instead, for reliable measurements of multiple FM signals, you should use equipment like our APM-16 or 4480A power sensors. The graphic below illustrates how two FM signals can exhibit AM when they add together.

 

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