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X-ray flares, which get through the ionosphere and mess with VHF and UHF.

The collapse of the magnetosphere on the night side following impact of a coronal mass ejection—which not only make a lot of VHF and UHF noise, they have enough power to just break a device.



In 433 MHz line-of-sight comms?

On the surface of the Earth?

If that ever happens, you have much bigger problems than a malfunctioning garage door.




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