monday wrote
Reply to comment by Zerush in Remote Neural Monitoring, Havana Syndrome and BadBIOS by nsopegasusyou
While the underlying concept is good, the typical foil helmet fails in design and execution. An effective Faraday cage fully encloses whatever it's shielding, but a helmet that doesn't fully cover the head doesn't fully protect it.
In 2005, a group of MIT students, prodded by "a desire to play with some expensive equipment," tested the effectiveness of foil helmets at blocking various radio frequencies.
The helmets shielded their wearers from radio waves over most of the tested spectrum (YouTube user Mrfixitrick likewise demonstrates the blocking power of his foil toque against his wireless modem) but, surprisingly, amplified certain frequencies: those in the 2.6 Ghz ( allocated for mobile communications and broadcast satellites) and 1.2 Ghz (allocated for aeronautical radionavigation and space-to-Earth and space-to-space satellites) bands.
moonlune wrote
amplified certain frequencies: those in the 2.6 Ghz and 1.2 Ghz
2.6 Ghz and 1.2 Ghz frequencies have a wavelength and half-wavelength of ~10cm respectively: that's about the size of a head. The EM waves probably gets amplified in the same way as the phenomenon that turns grapes in the microwave into plasma.
monday wrote
This feels like a villain idea to build a death ray machine
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