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Radio jamming is the deliberate blocking of or interference with wireless communications. [1] [2] In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio. [3] The concept can be used in wireless data networks to disrupt information flow. [4]
One radio faces the satellite, while the other radio faces the area not in direct coverage. The two radios relay the signals (rather than store-and-forward data bits) and must be isolated from each other to prevent feedback. The satellite-facing radio listens to the satellite and must be isolated from the transmitter repeating the signal.
It allows utilizing of one channel (radio or baseband frequency, timeslot, etc.) by many users sequentially at different times. This technology is mainly useful with sparsely used networks of transient clients, as opposed to PAMA (Permanently Assigned Multiple Access). By using DAMA technology the number of separate nodes that can use a limited ...
Several online retailers and drone technology companies are marketing the sale of radio frequency jammers as drone deterrence or privacy tools, sidestepping federal laws that prohibit such devices ...
Other materials used for fireblocking may include noncombustible materials such as gypsum board, cement board, or mineral fiber insulation blankets [2] [3] [4] Fire blocking is most critical in balloon framing, where a cavity may traverse multiple floors. More modern methods of platform-framing provide inherent fireblocking in most cases, since ...
Pimprenelle (Nicola version 2 System) A two-way communication system developed by the Spéléo Secours Français for speleologists. CREG Journal of the Cave Radio and Electronics Group of the British Cave Research Association; MST Global (formerly Mine Site Technologies) for more information on the PED through-the-earth communications system.
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Some modern fire-and-forget missiles like the Vympel R-77 and the AMRAAM use a combined approach, by using radar in the normal case, but switching to an antiradiation mode if the jamming is too powerful to allow them to find and track the target normally. This mode, called "home-on-jam", actually makes the missile's job easier, as the jammer ...