Discussion
What is the usual first check when a reflector antenna's gain is below specification?
Answer: D
Misalignment is the commonest and cheapest fault to find, and a feed even slightly off focus or off axis costs gain and distorts the pattern. Surface measurement is a much larger undertaking and is done when alignment has been eliminated. Amplifier noise affects the signal to noise ratio rather than the gain, and polarisation error would show as a loss on one polarisation only. Working from the cheapest and likeliest cause outward is what distinguishes fault finding from part swapping.
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