Frank H. Sanders and Robert T. Johnk

Abstract: This report describes emission–spectrum measurements of a denial-of-service (jammer) transmitter that was operated temporarily in 800 MHz and 1900 MHz cellular and PCS bands at a prison location. The jammer targeted signals indoors within a minimum-security facility operated by the Federal Bureau of Prisons. Spectrum measurements of the jammer emissions were performed inside and outside the targeted jamming zone with multiple measurement bandwidths and detectors, both in-band and in selected Federal land mobile radio and GPS spectrum bands. Measurements at each location were performed with the jammer on versus off so as to show the relative power levels of the jamming signal and the ambient cellular and PCS signals at each location. In-band jammer emissions were measured outside the targeted zone at distances of up to 127 m from the edge of the targeted zone

Keywords: harmful interference; cellular communications jamming; denial-of-service jamming; emission bandwidth; personal communications services (PCS) communications jamming; radio jamming; in-band emissions

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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