Abstract: This research explores the design, implementation, and testing of a 900 MHz GSM mobile jammer, successfully achieving a jammed signal output.

Introduction: The widespread use of mobile phones has led to concerns about their disruptive potential in certain environments like classrooms, courtrooms, and religious spaces. This research aimed to develop a device capable of blocking GSM 900 services to address these concerns.

Methodology: The research involved a two-phase approach. The first phase involved studying the GSM system to identify the optimal jamming technique, design the system, and choose appropriate components. The second phase focused on procuring the components, developing the schematics and PCB layout, assembling the device, taking measurements, and finally testing the mobile jammer. The jammer was designed with three primary sections: the Power Supply, the Intermediate Frequency (IF) Section, and the Radio Frequency (RF) Section. The device employs a Denial of Service (DOS) technique, transmitting noise on the same frequencies used by the GSM 900 band.

Key Findings:

  • The jammer successfully produced a jammed signal as observed on an oscilloscope.
  • The device achieved an output power of 5dBm during testing.
  • The effective jamming radius ranged from 5 to 10 meters, influenced by factors like atmospheric conditions and coverage intensity.
  • The research highlights the need for a more powerful amplifier, such as the PF08103B, to enhance the jamming radius. However, the availability of such amplifiers in Pakistan was a limitation.

Significance/Implications: The successful development of this GSM jammer demonstrates the feasibility of creating devices to control mobile phone usage in specific locations. This has potential implications for managing disruptions and maintaining decorum in environments where mobile phone use is deemed inappropriate. However, the legality of using such devices varies by country and should be carefully considered.

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Citation Information:

Shahid, Muhammad Nauman and Abbasi, Mansoor Ahmed and Rasool, Muhammad Ather, 900 MHz GSM Mobile Jammer (August 2, 2011). Department of Computer Science, Federal Urdu University of Arts, Science, and Technology, Islamabad, Pakistan, Available at SSRN: https://ssrn.com/abstract=3541567 or http://dx.doi.org/10.2139/ssrn.3541567