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" ... Jammers are designed to deny adversaries access to key frequencies on the electromagnetic spectrum so that sensors and communications links become useless. That mission has grown increasingly difficult with the proliferation of agile radars and frequency-hopping radios whose precise wavelengths can change unexpectedly. Jamming devices currently used by the U.S. military also interfere with the equipment of friendly forces operating in frequencies adjacent to enemy systems, a problem known as electronic fratricide. The Next Generation Jammer is supposed to mitigate these problems by fielding a family of airborne pods with much greater radiated power, spectral precision, agility and maintainability. The award BAE Systems challenged was worth $280 million, but over the lifetime of the program its potential value to the winning contractor is in excess of $10 billion. ... "
" ... The jammers currently in use on the Growler and legacy combat aircraft are gradually being overwhelmed by new enemy systems such as frequency-hopping radios and agile radars that they were not originally designed to defeat. They lack the power output, spectral coverage, precision and responsiveness to simultaneously suppress all the electronic threats to U.S. forces. In addition, they are increasingly hard to maintain in a high state of readiness, and their emissions sometimes interfere with the electronic operations of friendly forces (a phenomenon known in the electronic-warfare community as fratricide). ... "