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The transmitters were pulsed, like magnetrons, so while average power was low, peak power was high.As an example – the weakest transmitter Frey used was able to output a power density of 4 w/m² at 1310 Mhz. The US guideline for human exposure at that frequency is 6.55 w/m².The question though is what exactly could have caused these injuries.The press has gone wild with theories of sonic weaponry, hidden bugs, and electronic devices, poisons, you name it. Mass hysteria among the US state department, or something else entirely?Some staffers have reported hearing incapacitating sounds in the embassy and in their hotel rooms.The reports range from clicking to grinding, humming, or even blaring sounds.
Strangely, some of the test subjects were partially deaf, and still were able to hear the microwave sounds.
Since LRAD is still vibrating the air, it wouldn’t work very well through walls. They emit a beam 30 to 60 degrees wide, so definitely not a sound laser.
They also have plenty of spill — operators standing behind the device always need to wear hearing protection.
LRAD devices emit an extremely loud focused beam of sound.
Usually, the sound is a siren, though the system can be used as a giant megaphone as well. The thing about LRAD devices is they are not small or light. Making a lot of noise means vibrating a lot of air. The smallest portable device is roughly fifteen pounds.
One staffer described being awoken to a horrifically loud sound, only to have it disappear as soon as he moved away from his bed.