Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Frank Sanders; Robert Johnk; Mark A. McFarland; J. Randy Hoffman

Abstract: This report describes emission measurements on a denial–of–service (jammer) transmitter operating in the 800 MHz and 1900 MHz cellular and PCS bands. The jammer operates at a power level of up to 100 watts in each band, repetitively sweeping a carrier–wave signal across the range of frequencies in which service is to be denied. Frequency domain emissions were measured from 100 MHz to 6 GHz with 100 dB of dynamic range. With the installation of a diplexer that is used as an RF filter, some measurable out–of–band (OOB) emissions occur in spectrum adjacent to the fundamental–frequency bands. Across the rest of the 100 MHz to 6 GHz spectrum range, unwanted emission levels are suppressed by 100 dB or more when the diplexer is installed. OOB emissions in adjacent bands may be reduced by sweeping across less than the full width of the targeted bands, or by installing custom–designed RF output filtering.

Keywords: cellular communications jamming; denial-of-service jamming; emission bandwidth; out-of-band (OOB) emissions; personal communication service (PCS) communications jamming; radio jamming; unwanted emissions

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

For technical information concerning this report, contact:

Frank H. Sanders
Institute for Telecommunication Sciences
(303) 497-7600

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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