Design And Construction Of A Remote Controlled Tri–Band Frequency Jammer

INTRODUCTION
1.1 BACKGROUND OF THE STUDY
A mobile phone jammer or signal blocker is an instrument used to prevent cellular phones from receiving signals from base stations. The process of blocking the receiver to receive a transmitted signal is called Jamming of the signal. The jammer effectively disallows cellular phone signal when activated. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected. Such places include court rooms, meeting venues, lecture theatres or a library environment.
Mobile phone usage is at the increase and globally appreciated as it made the world a global village. In spite of its advantages, mobile phones are sometimes misused especially in the lecture halls, worship centers, movies theatres, concerts, and shopping malls, all suffer from the spread of cell phones because not all phone users know when to stop talking. These boss serious distractions [1].
Jamming in wireless networks is defined as the disruption of existing wireless communications by decreasing the signal-to-noise ratio at receiver sides through the transmission of interfering wireless signals. Jamming is different from regular network interferences because it describes the deliberate use of wireless signals in an attempt to disrupt communications whereas interference refer to unintentional forms of disruptions. Unintentional interference may be caused by the wireless communications among nodes within the same networks or other devices (e.g. microwave and remote controller). On the other hand, intentional interference is usually conducted by an attacker who intends to interrupt or prevent communications in networks. Jamming can be done at different levels, from hindering transmission to distorting packets in legitimate communications[6].
The concept came into existence through military use when one country during war situation did not want their radio transmission to be intercepted by the enemy, with the use of RF jammers to jam near border areas. Although in most parts of the world, the use is restricted based on specificlaws of the country, application is however allowed for research purposes since these jammers actively broadcast radio signals. One of those attempts led to the creation of radio jammers: in World War II, the British used to jam German radio communications [2, 3, 4].
Jammers work by giving a Radio Frequency (RF) signal or a signal at the same frequency expected by the device that’s being jammed, but at a higher power compared to the targeted signal. The jamming signal itself is usually a random noise. Jammers were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists [5]. The device being jammed will then receive the higher power signal which is from the jammer, and then the devices can no longer function correctly (Bhatia 2015). The technology being used in mobile phone jammers or signal blocker is very simple. It breaks down the network between base station and the cell phone and broadcasts a RF signal with frequency range of cell phones leading to the phone displaying no network available. This device can block the frequency range of 800 to 2100 MHz or the band for which it is designed and a coverage radius of few meters so that it does not disrupt the services of other users.
Mobile phone can be disabled via interrupting any of these signals. Because the distance to the base station is larger than the distance to mobile phone that needs to be blocked, it needs less energy to block signal from base station to phone[7].

1.2 STATEMENT OF PROBLEM
Constant interruptions at important gatherings and events as a result of the introduction of mobile communication platform as against the fixed line platform which enables users carry about their mobile phones is increasingly becoming a nuisance when rapt attention or quietness is desired. Modern technology has contributed to the sophistication of bombs which are being triggered by GSM and Radio signals. There is a rising need to use force to prevent cellular and phone-related interruptions. Following the failure of moral suasion and bold inscriptions placed at strategic points and entrances to the venue of events, participants either decide to ignore or completely do not process the instruction appropriately. The need for mobile phone jammers or signal jammer has become imperative to prevent or effectively stop these interruptions by blocking transmission of Radio and GSM signals.

1.3 AIM
Design and construction of a remote controlled tri–band frequency jammer.

1.4 OBJECTIVES
The main objective of this project include:
i. To design a remote control system of the circuit
ii. To design Intermediate Frequency (IF) section of the circuit.
iii. To design Radio Frequency (RF) section of the circuit.
iv. To design and construct a wireless signal jammer circuit.
v. To block mobile phone transmission by creating interference within the range of the jammer.

1.5 SIGNIFICANCE OF PROJECT
The major significance of this in communication is the reduction in the crime and espionage that are cell phone related such as academic cheating, industrial espionage, privacy invasion, organized theft etc. Although not without its legal issues and downsides, its method of working i.e. the denial of service has been very effective.

1.6 METHODOLOGY
This project work presents an operational frequency jammer. Three sections will be designed and integrated to form a complete circuit. The circuit will consist of the IF section, the RF section and power supply unit. The RF section which will consist of the Voltage Controlled Oscillator (VCO) using the ATMEGA328P microcontroller, the RF power amplifier and the antenna. The IF section will generate the tuning signal for the VCO in the RF section which will sweep the desired range of frequencies. The tuning signal will be generated by a triangle wave generator along with a noise generator and then offset by a proper amount so as to sweep the VCO output from the minimum desired frequency to a maximum. The jammer will be designed for fixed use thus taking its power from the regular 220V AC wall outlet. A 5 volt power supply will be designed as the jammer requires different DC input voltages. These components will be selected according to the desired specification such that the frequency range (800MHz to 2100MHz band) and coverage range (10m) is achieved.

1.7 SCOPE OF WORK
The scope of this project is limited to 800MHZ, 188MHZand 2100MHZ withremote controlled systems and remote controlled system it covered 10m.

1.7.1 OPERATIONAL DEFINITION OF TERMS
Jamming: A radio jammer is any device that deliberately blocks, jams or interferes withauthorized wireless communications. Jamming in wireless networks is defined as the disruptionof existing wireless communications by decreasing the signal-to-noise ratio at receiver sides through the transmission of interfering wireless signals.
1.7.2 Intermediate Frequency: In communications andelectronic engineering, an intermediatefrequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.
1.7.3 Radio Frequency: Radio frequency (RF) is any of the electromagnetic wave frequencies that liein the range extending from around 3 kHz to 300 GHz, which include those frequencies used for communications or radar signals. RF usually refers to electrical rather than mechanical oscillations. Radiofrequency (RF) energy is another name for radio waves. It is one form ofelectromagnetic energy which consists of waves of electric and magnetic energy moving together (radiating) through space.
1.7.4 Antenna: It is an electrical device which converts electric power into radio waves, and viceversa. It is usually used with a radio transmitter or radio receiver.
1.7.5 Voltage Controlled Oscillator: It is anelectronic oscillatorwhoseoscillation frequencyiscontrolled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently, modulating signals applied to control input may cause frequencymodulation (FM) or phase modulation (PM)

1.8 OUTLINE OF THESIS
This report is structured into five chapters for better understanding of how the aim of the project was achieved. Chapter one gives an introduction to the report stating the significance of the project, aim, objectives, the proposed procedure for carrying out this project work and the way the report is generally presented. Chapter two presents the literature review and the theoretical framework. Chapter three presents the methodology and equations used in the design, simulation and construction. Chapter four presents the results of the design. The findings and conclusion are presented in chapter five.