Discussion
Why is a spinning linear source used to measure axial ratio?
Answer: D
As the source rotates, the received level rises and falls between the two axes of the ellipse, so the peak to trough ratio read from the record is the axial ratio at that angle. Spinning it fast while the positioner turns slowly indeed gives both the pattern envelope and the axial ratio in one sweep, which is a real convenience but follows from the method rather than motivating it. Signal strength and source polarisation knowledge are not the argument.
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