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Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...
Portable jammers are phone-sized and low-powered devices. They can block data delivery at a distance up to 15 meters without barriers. Stationary jammers are more expensive and powerful. They usually have a larger jamming radius and wider frequency band. Strong jammers can require additional cooling as they can overheat.
The modularity enables users to scale the system according to operational requirements and the software allows programming of all signal generators independently to ensure utmost configurability and maximising the effectiveness of the jamming signals. Two soldiers with the 25th Infantry Division operate Thor and Minehound, two counter-IED devices.
A spokesperson for eBay said the company looked into the products and determined they were lawful white-noise machines or similar audio blockers, not FCC-prohibited radio signal jammers.
"The use of a phone jammer, GPS blocker, or other signal jamming device designed to intentionally block, jam, or interfere with authorized radio communications is a violation of federal law. There ...
However, the signal coverage area of a given cell site may change according to the time of day, weather, and physical obstructions in relation to where a cellular device attempts to access service. The maps of cell site coverage areas used by law enforcement may also lack precision as a general matter.
Radar jammer, a device used in radar jamming and deception; Radio jammer, a device used in radio jamming; Radio-controlled Improvised Explosive Device jammer, a counter-IED device; Mobile phone jammer, an instrument used to prevent cellular phones from receiving signals from base stations
The most important method to counter radar jammers is operator training. Any system can be fooled with a jamming signal but a properly trained operator pays attention to the raw video signal and can detect abnormal patterns on the radar screen. The best indicator of jamming effectiveness to the jammer is countermeasures taken by the operator.
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