NCJ Number
77186
Date Published
1981
Length
24 pages
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.