NCJ Number
17089
Date Published
1973
Length
72 pages
Annotation
THIS REPORT DEALS WITH THE DEVELOPMENT AND DEMONSTRATION OF A LOW COST PASSIVELY ACTIVATED ALARM SYSTEM CONCEPT USING BUILDING POWER LINES AS A RELIABLE INTERNAL TRANSMISSION COMPONENT.
Abstract
THIS REPORT PRESENTS A DISCUSSION OF SYSTEM DESIGN CONSIDERATIONS, DESIGN IMPLEMENTATION, TEST PLAN, TEST RESULTS, SYSTEM LIMITATIONS AND RECOMMENDED OPERATING PROCEDURES. RESEARCH REVEALS THAT THE POWER LINE ALARM TRANSMISSION SYSTEM IN ITS PRESENT FORM REPRESENTS A FEASIBLE CONCEPT. CERTAIN WEAKNESSES DO EXIST, HOWEVER, THE MAIN ONE BEING FALSE ALARM SUSCEPTIBILITY TO TWO SOURCES. ONE OF THESE SOURCES INCLUDED CERTAIN TYPES OF BROADCAST RECEIVERS WHICH USE A TRANSFORMERLESS POWER SUPPLY. FALSE ALARMS WERE ALSO INDUCED IN THE SYSTEM BY THE RAPID SWITCHING OF A HEAVY HEATING ELEMENT LOAD. RESEARCHERS CONCLUDE THAT THE TRANSITION OF THE SYSTEM FROM ITS PRESENT STATUS AS A PROVEN CONCEPT TO AN INEXPENSIVE HIGH RELIABILITY RESIDENTIAL ALARM SYSTEM WILL REQUIRE BOTH THE ENGINEERING OF A HARDWARE DEVELOPMENT PHASE AND FULL SCALE PRODUCTION ENGINEERING WITH A GOAL OF MAXIMIZING THE COST EFFECTIVENESS OF THE SYSTEM CONCEPT. FOR A STUDY OF THE CHARACTERISTICS OF WIRING SYSTEMS, SEE NCJ-15605.