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.
Articles in this section
- Can multiple FM signals be accurately measured using a traditional wattmeter?
- What is the importance of element selection for Directional Power Sensors (DPS)?
- What are Bird RF Power Sensors used for?
- Why is the SWR reading for my 4391A is high and not matching up with what I calculated?
- What details might I need to be aware of when monitoring the remote meter outputs of a Wattcher Series RF power monitor?
- What is the replacement part number for the power supply that comes with the model 4314C wattmeter?
- Are High Power elements and Wattmeters calibrated together?
- Do I have to send wattmeters and elements in at the same time?
- 2080-044 Meter Repair Kit
- 2080-002 Meter Repair Kit
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