Russian media has claimed its military is now capable of neutralising US warships with electronic jamming devices. Russian media has claimed its military is now capable of neutralising US warships with electronic jamming devices. A news report used this simulation as it claimed the technology was apparently used on a US warship.
For students taking the national university entrance exams in China, there’s now one more little thing to worry about: drones, deployed to catch cheaters.With the development of science and technology, cell phone blocker become smaller and smaller, more and more hidden. Introduced today is a very covert jammers- Photo frame design jammers Device.
US department of Homeland Security (DHS) operates autonomous drones patrolling over the USA-Mexico border, which suffer jamming attacks by border smugglers, mainly the drug cartels,” said Gai Mar-Chaim, Senior Partner at the management consulting firm POC. “The DHS gives high priority for lightweight anti-jamming solutions for this challenge, and Perfectjammer is the only commercially available solution that weighs less than 150 gram and consumes power less than 0.75 Watt.
To jam a cell phone, you need a device that broadcasts on the correct frequencies. Although different cellular systems process signals differently, all cell-phone networks use radio signals that can be interrupted. GSM, used in digital cellular and PCS-based systems, operates in the 900-MHz and 1800-MHz bands in Europe and Asia and in the 1900-MHz band in the United States. Jammers can broadcast on any frequency and are effective against AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems.
The drone is a hexarotor and, as reported by China’s state-owned ECNS news service, it will scan for suspicious radio signals from exam-takers. While that won’t stop any cheaters who use low-tech methods to get around difficult questions, it will detect any number of advanced methods that rely on the test-taker exchanging information with a second party outside the exam room. These methods include cameras hidden in glasses with transmitters hidden in water bottles, cell phones hooked up to flesh-colored wireless headphones, and pen cameras that film the exam-takers’ test.