Discussion
What is a positioner in an antenna measurement system?
Answer: C
The positioner turns the antenna under test in azimuth and elevation, or in roll, and reports its angle to the acquisition system, so its accuracy and repeatability enter every measured pattern directly. Multi axis positioners allow arbitrary pattern cuts. The receiver records level, software performs the transform, and the source mount is a separate structure. Mechanical accuracy is a first order contributor to an electrical measurement, which is easy to forget when reading a pattern plot.
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