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NCJRS Abstract

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NCJ Number: 77186 Find in a Library
Title: NIJ (National Institute of Justice) Standard for Fixed and Base Station Antennas
Corporate Author: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
Date Published: 1981
Page Count: 24
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
National Institute of Justice/
Rockville, MD 20849
US Dept of Justice NIJ Pub
Washington, DC 20531
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Language: English
Country: United States of America
Annotation: This document establishes minimum performance requirements and test methods for antennas that are used at base stations or other fixed sites by law enforcement agencies.
Abstract: A revision of NILECJ-STD-0204.00, the standard covers antennas used in the 800-960 MHz frequency band as well as the design and construction details of two types of reference antennas. For purposes of this standard, fixed and base station antennas are classified by their operating frequency and their directional pattern. The operating frequency included four classifications: type I, for antennas using the 25-50 MHz band; type II, for antennas using the 150-174 MHz band; type III, for antennas using the 400-512 MHz band; and type IV, for antennas using the 800-960 MHz band. The directional pattern is classified into two categories: omnidirectional antennas and directional antennas. The standard defines principal terms used, such as antenna power rating, effective antenna volume, and other technical terms. Performance requirements are delineated for rated power operation, relative antenna gain, radiation pattern, standing wave ratio, and wind velocity rating. In addition, information that must be supplied to the purchaser by the antenna manufacturer or distributor is listed. Test methods are described in detail, including standard test conditions, test equipment, scale model measurements, and specific tests (rated power operation test, relative antenna gain test, radiation pattern tests, and standing wave ratio test). Figures, a bibliography of 15 references, and drawings and information on reference antennas are appended.
Index Term(s): Antennas; Law Enforcement Standards Laboratory; Police equipment; Standards
Note: Part of the Technology Assessment Program.
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