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BODY-WORN FM (FREQUENCY MODULATION) TRANSMITTERS

NCJ Number
47378
Author(s)
R N JONES; L F SAULSBERY; J L WORKMAN
Date Published
1978
Length
26 pages
Annotation
A STANDARD IS PRESENTED ESTABLISHING PERFORMANCE REQUIREMENTS AND METHODS OF TESTING ADEQUACY OF BODY-WORN FREQUENCY-MODULATED (FM) TRANSMITTERS, OF THREE WATTS OR LESS, USED BY LAW ENFORCEMENT AGENCIES.
Abstract
INFORMATION PERTAINS TO THREE CLASSIFICATIONS OF FM TRANSMITTERS; THOSE OPERATING IN THE 400 TO 512 MHZ BAND, IN THE 150 TO 174 MHZ BAND, AND IN THE 25 TO 50 MHZ BAND. DEFINITIONS OF TERMS USED IN THE EQUIPMENT STANDARDS ARE PRESENTED. REQUIREMENTS FOR THE FOLLOWING ARE GIVEN: TRANSMITTER PERFORMANCE, TRANSMITTER, BATTERY, RADIO FREQUENCY CARRIER CHARACTERISTICS, OUTPUT POWER, FREQUENCY STABILITY, AMPLITUDE MODULATION (AM) HUM AND NOISE LEVEL, TRANSMITTER EFFICIENCY, AUDIOFREQUENCY RESPONSE, FREQUENCY DEVIATION, MODULATION LIMITING, ELECTROMAGNETIC COMPATIBILITY CHARACTERISTICS, RADIATED SPURIOUS EMISSIONS, SIDEBAND SPECTRUM, AND BATTERY SERVICE LIFE. TEST CONDITIONS ARE SPECIFIED AND METHODS FOR TESTING EACH OF THE ABOVE REQUIREMENTS ARE DELINEATED. APPENDIXES INCLUDE REFERENCES, MINIMUM PERFORMANCE REQUIREMENTS FOR THE THREE CLASSIFICATIONS OF TRANSMITTERS, AND DIAGRAMS FOR A NUMBER OF TEST MEASUREMENTS.