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              Microwave ray gun controls crowds with noise
Tuesday, July 8th, 2008
By David Hambling | A US company claims it is ready to build a microwave ray gun able to beam sounds directly into people’s heads. The device – dubbed MEDUSA (Mob Excess Deterrent Using Silent Audio) – exploits the microwave audio effect, in which short microwave pulses rapidly heat tissue, causing a shockwave inside the skull that can be detected by the ears. A series of pulses can be transmitted to produce recognisable sounds. The device is aimed for military or crowd-control applications, but may have other uses. Lev Sadovnik of the Sierra Nevada Corporation in the US is working on the system, having started work on a US navy research contract. The navy’s report states that the effect was shown to be effective. Scarecrow beam?MEDUSA involves a microwave auditory effect “loud” enough to cause discomfort or even incapacitation. Sadovnik says that normal audio safety limits do not apply since the sound does not enter through the eardrums. “The repel effect is a combination of loudness and the irritation factor,” he says. “You can’t block it out.” Sadovnik says the device will work thanks to a new reconfigurable antenna developed by colleague Vladimir Manasson. It steers the beam electronically, making it possible to flip from a broad to a narrow beam, or aim at multiple targets simultaneously. Sadovnik says the technology could have non-military applications. Birds seem to be highly sensitive to microwave audio, he says, so it might be used to scare away unwanted flocks. Sadovnik has also experimented with transmitting microwave audio to people with outer ear problems that impair their normal hearing. Brain damage riskJames Lin of the Electrical and Computer Engineering Department at the University of Illinois in Chicago says that MEDUSA is feasible in principle. He has carried out his own work on the technique, and was even approached by the music industry about using microwave audio to enhance sound systems, he told New Scientist. “But is it going to be possible at the power levels necessary?” he asks. Previous microwave audio tests involved very “quiet” sounds that were hard to hear, a high-power system would mean much more powerful – and potentially hazardous – shockwaves. “I would worry about what other health effects it is having,” says Lin. “You might see neural damage.” Sierra Nevada says that a demonstration version could be built in a year, with a transportable system following within 18 months. They are currently seeking funding for the work from the US Department of Defence. Have Your Say: Microwave ray gun controls crowds with noise Please read our posting guidelines before posting. Alternatively you can discuss this report here. One Response to “Microwave ray gun controls crowds with noise”
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October 10, 2007
Dear Member of the Legislature and Friends:
This letter is to ask for your help for the many constituents in our country who are being affected unjustly by electronic weapons torture and covert harassment groups. Serious privacy rights violations and physical injuries have been caused by the activities of these groups and their use of so-called non-lethal weapons on men, women, and even children.
I am asking you to play a role in helping these victims and also stopping the massive movement in the use of Verichip and RFID technologies in tracking Americans.
Long before Verichip was known we were testing these devices on Americans, many without their knowledge or consent. With the new revelations of the cancer risk besides the privacy and human rights problems with the use of Verichip and RF signals, I am asking for your help in stopping these abuses and aiding those already affected.
Sincerely,
Rep. Jim Guest
District Office: 660-535-6664
Capitol Office: 573-751-0246
Respectfully James Walbert 316-650-6976