Design And Implementation Of 900mhz Mobile Electromagnetic Wave Interference System For Examination Hall Protection

Abstract

This work aimed at design and implementation of 900MHz mobile electromagnetic wave interference system for examination hall protection. The work focused on design and building of a system that can block the use of mobile phone by transmitting radio waves of the same frequencies as that of the mobile phone causing interference between mobile phone and the Base Transceiver Station. The objectives of the work include the design and building of a power supply that would distribute power to other parts of the system for operation; designing and constructing the intermediate frequency section which helps to generate the tuning frequency (noise) signal; designing and constructing the radio frequency section which helps to generate radio frequency signal that would create interference with signal from base transceiver station so as to block transmission between mobile phone and base transceiver station and integrating different sub-systems to form one single system. The system was tested for functionality and the test results showed that a stable noise signal of 7.09MHz from the intermediate frequency-section was generated. Result showed that a final output frequency of 900MHz from the antenna was obtained.