Discussion
What is the effect of solar heating on a large reflector antenna?
Answer: C
Sunlight on one side of a structure expands it unevenly, deforming the surface and moving the feed relative to the focus, which shows up as a gain and pointing variation through the day. Insulation, ventilation and thermal models are the usual remedies, and some instruments observe only at night at the highest frequencies. Physical temperature affects noise rather than radiated power, feed detuning is negligible, and air heating is a small propagation effect. Thermal deformation is a first order problem at millimetre wavelengths.
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