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In 1900, Marconi patented improvements for transmitters and receivers that solved the problem of the jamming of wireless signals.
BBC: Profile: Marconi, the wireless pioneer
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Attacks like the "evil twin" disrupt a company's network from the outside, jamming its radio signals or bogging it down with a denial of service attack, then broadcasting a counterfeit signal into the building.
FORBES: How Lehman Brothers Overcame Its Wireless Fears
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There have been a few anecdotal concerns raised over the last several weeks that LightSquared's proposed LTE network -- which would repurpose L-band spectrum formerly used for satellite -- is too close to the spectrum used by the Global Positioning System, leading to unintentional jamming when the towers overpower the much weaker GPS signals.
ENGADGET: US Air Force raises concerns over LightSquared's LTE network messing with GPS
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For instance, the new design would substitute precision for raw power in defeating hostile radars, thus eliminating the fratricidal effects of jamming signals on friendly communications links.
FORBES: In Digital Age, U.S. Military Still Stuck With Vietnam-Era Jammers
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Additional concerns remain about the vulnerability of the communications signals to electronic jamming, though there's no evidence that has occurred, said people familiar with reports on the matter.
WSJ: Insurgents Hack U.S. Drones
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"Vertical jamming" sends powerful noise signals directly to the satellite to override a channel's entire feed.
WSJ: Censorship Inc.: In Skies Over Iran, a Battle for Control of Satellite TV
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The core of the electronics business is a legendary New England technology enterprise once known as Sanders, which may be the most knowledgeable organization in the world on arcane missions like signals intelligence and jamming.
FORBES: British-Based BAE Systems Shifts U.S. Strategy
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It works by jamming all nearby transmissions at the operating frequency of the medical device, except for those signals that were authorized to use the device.
FORBES: Protecting Pacemakers From Hackers
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Instead of jamming electrons through wire, generators convert them to microwave signals and fling these along the surface of the earth, between a system of relays spaced about 20 or 30 miles apart.
FORBES: The Trials Of Amory Houghton Jr.