Before revision: Below is a YouTube clip: Rock and Feather Drop at NASA's Space Power Facility Electromagnetic Interference/Compatibility (EMI/EMC) functionality Designed specifically as a large-scale thermal-vacuum test chamber for qualification testing of vehicles and equipment in outer-space conditions, it was discovered in the late 2000s that the unique construction of the SPF interior aluminum vacuum chamber also makes it an extremely large and electrically complex RF cavity with excellent reverberant RF characteristics.
After revision: Below is a YouTube clip: Rock and Feather Drop at NASA's Space Power Facility Electromagnetic Interference/Compatibility (EMI/EMC) functionality Designed specifically as a large-scale thermal-vacuum test chamber for qualification testing of vehicles and equipment in outer-space conditions, it was discovered in the late 2000s that the unique construction of the SPF interior aluminum vacuum chamber also makes it an extremely large and electrically complex Microwave cavity, with excellent reverberant Electromagnetism characteristics.