people.csail.mit.edu/rahimi/helmet -> people.csail.mit.edu/rahimi/helmet/
Abstract Among a fringe community of paranoids, aluminum helmets serve as the prot ective measure of choice against invasive radio signals. We investigate the efficacy of three aluminum helmet designs on a sample group of four individuals. Using a $250,000 network analyser, we find that although on average all helmets attenuate invasive radio frequencies in either dire ctions (either emanating from an outside source, or emanating from the c ranium of the subject), certain frequencies are in fact greatly amplifie d These amplified frequencies coincide with radio bands reserved for go vernment use according to the Federal Communication Commission (FCC). St atistical evidence suggests the use of helmets may in fact enhance the g overnment's invasive abilities. We speculate that the government may in fact have started the helmet craze for this reason. Introduction It has long been suspected that the government has been using satellites to read and control the minds of certain citizens.
Surprisingly, these helmets can in fact help the gov ernment spy on citizens by amplifying certain key frequency ranges reser ved for government use. In addition, none of the three helmets we analyz ed provided significant attenuation to most frequency bands. We describe our experimental setup, report our results, and conclude with a few design guidelines for constructing more effective helmets.
The Centurion We evaluated the performance of three different helmet designs, commonly referred to as the Classical, the Fez, and the Centurion. These designs are portrayed in Figure 1 The helmets were made of Reynolds aluminium f oil.
A radio-frequency test signal sweeping the ranges from 10 Khz to 3 Ghz wa s generated using an omnidirectional antenna attached to the Agilent 871 4ET's signal generator. CAPTION: The experimental apparatus, including a data recording laptop, a $250,000 network analyser, and antennae.
A network analyser (Agilent 8714ET) and a directional antenna measured an d plotted the signals. See Figure 2 Because of the cost of the equipment (about $250,000), and the limited ti me for which we had access to these devices, the subjects and experiment ers performed a few dry runs before the actual experiment (see Figure 3) .
The receiver antenna was placed at various places on the cranium of 4 dif ferent subjects: the frontal, occipital and parietal lobes. The network analyzer plotted t he attenuation betwen the signals in these two settings at different fre quencies, from 10Khz to 3 Ghz. Figure 4 shows a typical plot of the atte nuation at different frequencies.
Results For all helmets, we noticed a 30 db amplification at 26 Ghz and a 20 db amplification at 12 Ghz, regardless of the position of the antenna on t he cranium. In addition, all helmets exhibited a marked 20 db attenuatio n at around 15 Ghz, with no significant attenuation beyond 10 db anywhe re else. Conclusion The helmets amplify frequency bands that coincide with those allocated to the US government between 12 Ghz and 14 Ghz.
Though not affiliated by government, these bands are at the hands of multinational corporation s It requires no stretch of the imagination to conclude that the current he lmet craze is likely to have been propagated by the Government, possibly with the involvement of the FCC. We hope this report will encourage the paranoid community to develop improved helmet designs to avoid falling prey to these shortcomings. Acknowledgments The authors would like to thank Andy (Xu) Sun of the MIT Media Lab for he lping with the equipment, Professor George Sergiadis for lending us the antennae, and Professor Neil Gershenfeld for allowing us the use of his lab equipment.
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