Singe dish telescopes generally fall into the second category of observatories that are affected by low-level RFI, and I'm pretty sure that holds for FAST. But even for e.g. the Murchison RA observatory that only has interferometers, they do test equipment beforehand, because they are a problem. ( I'm also a radio astronomer )
Radio emissions from the sun are not at all weak -- at most frequencies the Sun is the brightest source in the sky, stronger than CasA and CygA. You are right that daytime observing is possible with radio telescopes, but night time data is generally more valuable.
While turning a cellphone into airplane mode probably solves the problem for 90%, the digital electronics inside a cellphone that is turned on still cause some RFI. That's why for most radio quiet zones, electronic devices that need to enter the radio quiet zones are carefully tested / selected before bringing them on site.
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Singe dish telescopes generally fall into the second category of observatories that are affected by low-level RFI, and I'm pretty sure that holds for FAST. But even for e.g. the Murchison RA observatory that only has interferometers, they do test equipment beforehand, because they are a problem. ( I'm also a radio astronomer )
Radio emissions from the sun are not at all weak -- at most frequencies the Sun is the brightest source in the sky, stronger than CasA and CygA. You are right that daytime observing is possible with radio telescopes, but night time data is generally more valuable.
While turning a cellphone into airplane mode probably solves the problem for 90%, the digital electronics inside a cellphone that is turned on still cause some RFI. That's why for most radio quiet zones, electronic devices that need to enter the radio quiet zones are carefully tested / selected before bringing them on site.