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22-12-2019, 23:48 door Anoniem

Microwaving passive circuits https://hackaday.com/2015/12/08/theremins-bug/ Initial versions used a planted resonant cavity, then the Russians learned that with enough RF power they could get audio modulation from common office equipment (i.e. metal cabinets) . This is why they were illuminating embassies with high-power CW. Many thought it was for “mind control.” LOL! Modern versions can detect the micro-vibrations directly off the target’s larynx. Using a mm-wave version fitting in the palm of you hand you can “listen” to two targets talking out in a field – while they stand next to a running lawn mower… You can also “listen” to a target in a vehicle in front of you while trailing them. Track down “A Ka-Band Low-Power Doppler Radar System for Remote Detection of Cardiopulmonary Motion” for more info. State-of-the art systems are completely passive and can detect the mm-wave radiation (+95 GHz) emitted by the human body. You use a diode detector and standard amplifiers. Just like ...

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