The Antenna Systems RFJ7 is a barrage radio frequency jammer

The Antenna Systems RFJ7 is a barrage radio frequency jammer. It is used to create a cellular communications "dead zone" by anti-terrorist bomb squads, drug enforcement task forces, and others. The TX frequency is 134-174 MHz and 400-512 MHz, noise type is broadband noise, and power is 50 W. The dimensions are 10.5"x19"x28" and the weight is 110lbs. Broadband Barrage Radio Frequency Jammer Antenna Factory RFJ7 This kind of jammer is about the only way to jam frequency-agile radars, which change frequencies too quickly for other methods. Barrage jamming reduces the need for operator assistance or complex control equipment, while making it possible to jam emitters on different frequencies simultaneously. But spreading out energy this way also means you get reduced jamming power at any given frequency.