Discussion
Why must the antenna under test be aligned with the positioner axes?
Answer: D
If the antenna's phase centre and axes do not coincide with the rotation axes, the antenna translates as well as rotates, and the measured pattern is distorted and its boresight displaced. Careful optical or laser alignment is therefore part of the setup. Mechanical support, far field distance and terminal impedance are not affected in the same way. A measurement geometry that departs from the assumed one produces errors that look like antenna faults, which is why alignment is checked first.
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