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protected frequency stresses
media.	защищённая частота (которая не может быть подавлена в течение определённого периода)
telecom.	избирательно не подавляемая службами глушения дружественных государств; частота
English thesaurus
protected frequency
mil., logist.	A frequency on which, upon order, there must be no friendly jamming. (FRA)
protected frequencies
USA	Friendly, generally time-oriented, frequencies used for a particular operation, identified and protected to prevent them from being inadvertently jammed by friendly forces while active electronic warfare operations are directed against hostile forces (JP 3-13.1) see also electronic warfare