NCJ Number
25996
Date Published
1975
Length
32 pages
Annotation
DOCUMENT WHICH ESTABLISHES PERFORMANCE REQUIREMENTS AND TESTING METHODS FOR FREQUENCY MODULATED MOBILE AND VEHICULAR RECEIVERS USED BY LAW ENFORCEMENT AGENCIES.
Abstract
THIS STANDARD APPLIES TO VOICE-MODULATED, NON-MULTIPLEX RECEIVERS WHICH EITHER DO NOT HAVE SPECIAL SUBSYSTEMS SUCH AS SELECTIVE SIGNALING OR VOICE PRIVACY, OR WHICH HAVE SUCH SUBSYSTEMS BUT THESE SUBSYSTEMS ARE DISABLED OR BY-PASSED DURING TESTING FOR COMPLIANCE WITH THIS STANDARD DEVELOPED BY THE LAW ENFORCEMENT STANDARDS LABORATORY. THE RECEIVERS TESTED OPERATE IN THE 25-50 MHZ, 150-174MHZ AND 400-512 MHZ BANDS. THE PRINCIPAL TERMS AND DEFINITIONS USED IN THE STANDARD ARE DEFINED, AS ARE THE MOST CRITICAL ITEMS OF TEST EQUIPMENT NEEDED TO MAKE THE REQUIRED MEASUREMENTS. THE STANDARD LISTS PERFORMANCE REQUIREMENTS AND TEST METHODS FOR 18 DIFFERENT ATTRIBUTES, SUCH AS SINAD (SIGNAL NOISE AND DISTORTION) SENSITIVITY, INTERMODULATIONS ATTENUATION, AUDIO DISTORTION, AND AUDIOFREQUENCY RESPONSE. THE APPENDIX CONTAINS A BIBLIOGRAPHY, A TABLE OF MINIMUM PERFORMANCE REQUIREMENTS FOR MOBILE FM RECEIVERS, AND SEVERAL BLOCK DIAGRAMS ON THE MEASUREMENT OF MINIMUM PERFORMANCE REQUIREMENTS. THIS DOCUMENT IS INTENDED FOR USE BY LAW ENFORCEMENT AGENCIES IN THEIR SELECTION AND PROCUREMENT OF MOBILE FM RECEIVERS. (SNI ABSTRACT)