• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
TRANSMISSION SECURITY
Electromagnetic Interference (emi)

Neets Module 17-Radio-Frequency Communications Principles
Page Navigation
  90    91    92    93    94  95  96    97    98    99    100  
3-38 SHIPBOARD COMMUNICATIONS SYSTEMS QUALITY MONITORING (QMCS) In recent years the volume of shipboard communications has increased greatly. This expansion has led to the shipboard installation of sophisticated equipment. Factors such as frequency accuracy and dc signal distortion are critical to the operation of communications systems. These systems demand precise initial lineup and monitoring to ensure satisfactory operations are maintained. System degradation is often caused by many small contributing factors. When these factors are added together, the system becomes unusable. Scheduled Maintenance When you perform scheduled, logical checks that ensure continuous, optimum performance of shipboard communications systems, you are doing SCHEDULED MAINTENANCE. In many cases this maintenance prevents outages before they occur. Some of the scheduled checks will include the following: Transmitter/receiver frequency Transmitter power out Receiver sensitivity/bandwidth Primary power (voltage, current, cycles) Electromagnetic Interference (emi) Many complex electronic systems are installed aboard Navy ships. In modern ships, complex systems with higher power and greater sensitivity are being crowded into a restricted and corrosive area. Figure 3-34 is a Spruance class destroyer with its crowded (compact) communications environment. The ability of these systems to perform their individual functions without interference is known as ELECTROMAGNETIC COMPATIBILITY (emc). Emc is concerned with the structure of the ship and its electrical and electronic system. Compact environment is a major limitation to the effectiveness of a total ship system concept. Figure 3-34.—Total ship.






Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.