This document describes the components and design of a mobile phone jammer. It discusses the key components which include a voltage controlled oscillator, tuning circuit, noise generator, RF amplification unit, transmitting antenna, and power source. It also describes different mobile jamming techniques and provides specifications for designing a mobile jammer such as frequency bands, desired coverage distance, jamming-to-signal ratio, and power calculations. The document aims to provide an overview of how mobile jammers work and the parameters involved in their design.
The document is a term paper on cell phone jammers submitted by Sameer Gupta. It discusses the history of cell phone jammers and how they work to disrupt communication between a cell phone and cell tower. It describes the components of a cell phone jammer including the power supply, circuitry, and antenna. It also covers jamming techniques, types of jammers, applications, legal issues, and alternatives to jamming. The paper was submitted to fulfill requirements for a course at Amity University Rajasthan under the guidance of instructor Sally Goyal.
The document discusses mobile phone jammers, including what they are, how they work, different types, and applications. Mobile jammers transmit signals that block the communication between mobile phones and cell towers, rendering phones unusable. The document outlines five main jamming techniques (A through E), provides a sample block diagram, and discusses potential future applications while noting legal restrictions.
This document describes a cell phone jammer device that can be programmed with scheduled time durations for activation and deactivation. It discusses the basic technology behind how cell phone jammers work by transmitting radio signals that interfere with communication between cell phones and towers. The proposed system aims to design a jammer that can be controlled through a microcontroller programmed with activation and deactivation time schedules using a real-time clock. A block diagram is presented showing the overall design and working principle.
The document discusses cell phone jammers, which create temporary "dead zones" that disrupt cell phone signals. It describes how jammers work by transmitting radio frequencies that interfere with communication between a phone and cell tower. Jammers can block signals in a 30-foot radius for smaller devices, and up to a mile for powerful law enforcement units. While jammers are illegal in most areas, the document outlines their applications for law and military use, as well as in schools and prisons to prevent cheating or illegal cell phone use.
Deepak Bhojwani's document discusses mobile phone jammers. It defines a mobile phone and mobile phone jammer. A mobile phone jammer prevents cellular phones from receiving signals by transmitting interfering radio waves on the same frequencies. The document describes the components, design parameters, and techniques of mobile phone jammers. It provides examples of jammer applications and concludes that while jammers have beneficial uses, they can also cause problems depending on the situation.
A mobile phone jammer is a device that transmits signals on the same frequencies used by cellular networks, preventing phones from connecting to cell towers. It works by overpowering the communication between a phone and tower with higher power radio signals, rendering phones unusable. Mobile jammers were originally developed for law enforcement to interrupt criminal communications but some were designed for detonating explosives. There are different types of jammer devices that can be used to prevent cell phone disturbances in places like classrooms, hospitals, and religious sites.
The document discusses mobile jammers, which are devices that transmit signals to prevent cellular phones from receiving signals from base stations. It describes how jammers work by interfering with communication between phones and towers. The document outlines different jamming techniques, including intelligent disablers and beacon disablers. It also covers design parameters for jammers like frequency bands and power supply. Applications of jammers mentioned include maintaining silence in classrooms and hospitals.
The document is a term paper on cell phone jammers submitted by Sameer Gupta. It discusses the history of cell phone jammers and how they work to disrupt communication between a cell phone and cell tower. It describes the components of a cell phone jammer including the power supply, circuitry, and antenna. It also covers jamming techniques, types of jammers, applications, legal issues, and alternatives to jamming. The paper was submitted to fulfill requirements for a course at Amity University Rajasthan under the guidance of instructor Sally Goyal.
The document discusses mobile phone jammers, including what they are, how they work, different types, and applications. Mobile jammers transmit signals that block the communication between mobile phones and cell towers, rendering phones unusable. The document outlines five main jamming techniques (A through E), provides a sample block diagram, and discusses potential future applications while noting legal restrictions.
This document describes a cell phone jammer device that can be programmed with scheduled time durations for activation and deactivation. It discusses the basic technology behind how cell phone jammers work by transmitting radio signals that interfere with communication between cell phones and towers. The proposed system aims to design a jammer that can be controlled through a microcontroller programmed with activation and deactivation time schedules using a real-time clock. A block diagram is presented showing the overall design and working principle.
The document discusses cell phone jammers, which create temporary "dead zones" that disrupt cell phone signals. It describes how jammers work by transmitting radio frequencies that interfere with communication between a phone and cell tower. Jammers can block signals in a 30-foot radius for smaller devices, and up to a mile for powerful law enforcement units. While jammers are illegal in most areas, the document outlines their applications for law and military use, as well as in schools and prisons to prevent cheating or illegal cell phone use.
Deepak Bhojwani's document discusses mobile phone jammers. It defines a mobile phone and mobile phone jammer. A mobile phone jammer prevents cellular phones from receiving signals by transmitting interfering radio waves on the same frequencies. The document describes the components, design parameters, and techniques of mobile phone jammers. It provides examples of jammer applications and concludes that while jammers have beneficial uses, they can also cause problems depending on the situation.
A mobile phone jammer is a device that transmits signals on the same frequencies used by cellular networks, preventing phones from connecting to cell towers. It works by overpowering the communication between a phone and tower with higher power radio signals, rendering phones unusable. Mobile jammers were originally developed for law enforcement to interrupt criminal communications but some were designed for detonating explosives. There are different types of jammer devices that can be used to prevent cell phone disturbances in places like classrooms, hospitals, and religious sites.
The document discusses mobile jammers, which are devices that transmit signals to prevent cellular phones from receiving signals from base stations. It describes how jammers work by interfering with communication between phones and towers. The document outlines different jamming techniques, including intelligent disablers and beacon disablers. It also covers design parameters for jammers like frequency bands and power supply. Applications of jammers mentioned include maintaining silence in classrooms and hospitals.
The document discusses different types of cell phone jammers, including their principles of operation, design parameters, functional units, and jamming techniques. It describes how jammers work by transmitting radio frequencies to interfere with cell phone signals and disrupt communication between phones and towers. The document outlines the advantages of jammers for situations like exams or sensitive meetings, but also notes the disadvantages like inconvenience and inability to make emergency calls. It concludes by discussing potential future improvements and both useful and problematic aspects of cell phone jamming technology.
This document provides an overview of mobile phone jammers, including: how they work by transmitting signals on the same frequencies used by cell phones to disrupt communication; the history of their development for law enforcement and military use; and the different types of jammer devices (types A through E). It also discusses applications of jammers like maintaining silence in libraries, preventing cell phone use in exams, and providing security in certain settings.
This document discusses mobile phone jammers, including their components, techniques, applications, and future. It describes how jammers work to block mobile signals using a voltage controlled oscillator, tuning circuit, noise generator, RF amplification and transmitting antenna. It outlines different jamming techniques like intelligent cellular disablers and beacon disablers. Potential applications of jammers include maintaining silence in libraries, exams, and religious establishments. The future of jamming technology may involve passive blocking without actively disrupting signals.
The document discusses cell phone jammers and detectors. It describes different types of jammers including those that disrupt phone-to-tower frequencies and tower-to-phone frequencies. It explains how jammers work by transmitting radio frequencies to disrupt communication between phones and cell towers. Applications mentioned include using jammers to maintain silence in libraries, avoid distractions in classrooms, and provide security in meetings. The document also covers the components of a jammer including the power supply, IF section, RF section, and antenna. Finally, it introduces cell phone detectors and their uses in hospitals and airports to detect signal presence.
A Cell phone jammer is a device used to prevent cellular phones from receiving signals from base stations.
It is a device that transmit signal on the same frequency at which the GSM system operates, the jamming is success when the mobile phones are disabled in the area where the jammer is located.
This document discusses cell phone jammers. It begins with an introduction that explains cell phone jammers create temporary dead zones for cell phone signals. It then describes how jammers work by transmitting frequencies that disrupt communication between phones and towers. The document outlines different types of jamming techniques and provides block diagrams of jammer components. It discusses applications of jammers and the future scope of jamming technology. In conclusion, it states that while jammers can be useful, how the technology is used is important.
Mobile jammers are devices that transmit signals to prevent cellular phones from receiving signals from base stations. They work by transmitting powerful radio frequencies that disrupt communication between phones and cell towers. There are different types of jamming techniques, including devices that transmit interfering signals (Type A), detect signals in quiet areas (Type B), function as beacons to disable phones (Type C), directly interact with phones (Type D), and use electromagnetic shielding (Type E). Mobile jammers have applications in maintaining silence in places like libraries, avoiding distractions in classrooms, and providing security in conferences. While jamming devices are illegal, companies are working on passive blocking technologies.
Cell phones are everywhere these days. According to the Cellular Telecommunications and Internet Association, approx. 1000 million people in India had cell-phone service.
Due to wide use of mobile phones it creates some problems as the sound of ringing becomes annoying or disrupting.
A cell phone jammer is a device that blocks transmission or reception of signals, usually by creating some form of interference at the same frequency ranges that cell phones use.
As a result, a cell phone user will either lose the signal or experience a significant loss of signal quality.
This document presents a project report on the design of a signal jammer. It was submitted by four students - Aryan Kumar, Karthikeyan R, M Aditya, and Nikhil Kumar - to Visvesvaraya Technological University in partial fulfillment of their Bachelor of Engineering degree in Electronics and Communication Engineering. The report provides background on signal jammers, their working mechanism, a literature survey on relevant technologies like GSM, and a detailed design of the jammer system implemented by the students including the power supply, IF section, RF section, and results of testing the jammer on different mobile networks in India.
This document discusses a student project to design a cell phone jammer with prescheduled time duration. It includes a block diagram of the jammer controller and describes how mobile jammers work by transmitting radio signals on the same frequencies used by mobile phones to disrupt communication between phones and cell towers. The goal of the project is to allow the jammer to be activated only during preset time periods to block phone signals in certain locations like exam halls.
Mobile phone jammers are devices that prevent cellular phones from receiving or sending signals to cell towers by transmitting radio waves on the same frequencies. They can block cell signals within a range of a few feet to several kilometers depending on the model. While they have legitimate uses like in prisons and military zones, mobile jammers are illegal to operate in many places due to safety and privacy concerns.
This document summarizes a seminar presentation on mobile phone jammers. It discusses the history of jammers originally being developed for law enforcement, and how jammers work by transmitting radio frequencies to disrupt communication between phones and towers. The document outlines different jamming techniques including intelligent disablers and passive shielding. It also discusses applications of jammers in limiting distractions and providing security, while noting disadvantages in blocking emergency communications. The conclusion examines both beneficial and problematic aspects of the technology.
Mobile phone intelligent jamming systemPatel Ibrahim
This document presents a project proposal for an intelligent mobile phone jamming system. The system is designed to prevent cell phones from operating in restricted areas in Jordan in a targeted manner. It aims to solve issues with non-intelligent jammers that block all mobile phones or the entire frequency band continuously. The intelligent jammer proposed works by detecting when a mobile phone is active in the restricted area and only then transmitting jamming signals to block that specific phone, avoiding disruption in other areas. The document outlines the system design and electronic circuits that will be implemented, including a mobile detector, frequency synthesizer, and power amplifier stages. It also discusses the software and microcontroller that will control the system.
A mobile phone jammer is a device that transmits signals on the same frequencies used by cell phones to disrupt communication between phones and cell towers. It works by causing interference that renders phones unusable within its range. The document discusses the history of jammers originally being developed for law enforcement, describes how jammers work by transmitting stronger signals to disrupt phone-tower frequencies, and lists some applications such as maintaining silence in libraries, exam halls, and providing security in meetings.
This handy, it can be used to prevent use of mobile phones in examination halls, confidential rooms and, etc. It is also useful for detecting the use of mobile phone for Spying and unauthorized video transmission. The circuit can detect the incoming calls pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. So and also outgoing calls, SMS and video transmissions even if the mobile phone is kept in the silent mode. The moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. The capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. we have to carefully solder the capacitor in standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. We are using a short telescopic type antenna. The unit will give the warning indication if someone uses Mobile phone within a radius of 1.5 meters.
This document describes a student project to build a cell phone jammer with a prescheduled time duration. It discusses using a PIC16F877A microcontroller to control a jammer circuit that can block GSM, DCS, and CDMA signals for a set period of time using real-time clock functionality. The project aims to allow users to select the cellular network and set the start and stop times for jamming through switches connected to the microcontroller.
This project report describes the development of a cellphone RF signal detector and jammer. The system uses a microcontroller to control a jammer and detector circuit. The jammer blocks cellphone signals within a defined range when activated, and the detector can sense activated cellphones from 1.5 meters away. The report includes the block diagram of the system, descriptions of the components, literature on jamming techniques and design parameters, schematics of the jammer and detector circuits, software used in development, and applications of the technology.
Project report of Cell phone detector circuitMoin Aman
This project report describes a cell phone detector circuit that can sense the presence of an activated mobile phone from 1.5 meters away. The circuit detects incoming/outgoing calls, SMS, and video transmission even if the phone is on silent. When it detects a signal, the circuit sounds an alarm and an LED blinks until the signal stops. The report provides the circuit diagram, component list, descriptions of key components like the CA3130 operational amplifier and NE555 timer, and discusses the basic concept and working of the detector by explaining how mobile phone signals are transmitted and can be picked up.
This document summarizes a seminar presentation on wirelessly charging mobile phones using microwaves. It discusses using a magnetron in the transmitter section to generate microwaves at 2.45 GHz, which are transmitted via a slotted waveguide antenna. In the receiver section, a sensor detects when a call is placed and a rectenna converts the microwave energy to DC power to charge the phone battery. Some advantages are wireless charging and potential to charge as long as a call is placed, while disadvantages include potential radiation issues and limited charging rates. The overall goal is to allow mobile phones to charge without wired connections.
There is great need to limit the use of cell phone at particular places
and at particular times. Hence, the use of intelligent cell phone detector is
guaranteed. This work concentrates in designing a system that will dictate the
presence of GSM signals from an unauthorized user in restricted areas which
will in turn trigger another device to restrict the user from service
This document describes the design and implementation of a GSM mobile phone jammer. It begins with an introduction to mobile jamming techniques and an overview of the requirements for a GSM jammer. It then details the design of the jammer, including the RF section with a voltage controlled oscillator, power amplifier, and antenna. It also describes the IF section and power supply. The document concludes that a jamming power of 34dBm is required to jam mobile phones within a 20m range and disrupt calls in the target area.
The document discusses different types of cell phone jammers, including their principles of operation, design parameters, functional units, and jamming techniques. It describes how jammers work by transmitting radio frequencies to interfere with cell phone signals and disrupt communication between phones and towers. The document outlines the advantages of jammers for situations like exams or sensitive meetings, but also notes the disadvantages like inconvenience and inability to make emergency calls. It concludes by discussing potential future improvements and both useful and problematic aspects of cell phone jamming technology.
This document provides an overview of mobile phone jammers, including: how they work by transmitting signals on the same frequencies used by cell phones to disrupt communication; the history of their development for law enforcement and military use; and the different types of jammer devices (types A through E). It also discusses applications of jammers like maintaining silence in libraries, preventing cell phone use in exams, and providing security in certain settings.
This document discusses mobile phone jammers, including their components, techniques, applications, and future. It describes how jammers work to block mobile signals using a voltage controlled oscillator, tuning circuit, noise generator, RF amplification and transmitting antenna. It outlines different jamming techniques like intelligent cellular disablers and beacon disablers. Potential applications of jammers include maintaining silence in libraries, exams, and religious establishments. The future of jamming technology may involve passive blocking without actively disrupting signals.
The document discusses cell phone jammers and detectors. It describes different types of jammers including those that disrupt phone-to-tower frequencies and tower-to-phone frequencies. It explains how jammers work by transmitting radio frequencies to disrupt communication between phones and cell towers. Applications mentioned include using jammers to maintain silence in libraries, avoid distractions in classrooms, and provide security in meetings. The document also covers the components of a jammer including the power supply, IF section, RF section, and antenna. Finally, it introduces cell phone detectors and their uses in hospitals and airports to detect signal presence.
A Cell phone jammer is a device used to prevent cellular phones from receiving signals from base stations.
It is a device that transmit signal on the same frequency at which the GSM system operates, the jamming is success when the mobile phones are disabled in the area where the jammer is located.
This document discusses cell phone jammers. It begins with an introduction that explains cell phone jammers create temporary dead zones for cell phone signals. It then describes how jammers work by transmitting frequencies that disrupt communication between phones and towers. The document outlines different types of jamming techniques and provides block diagrams of jammer components. It discusses applications of jammers and the future scope of jamming technology. In conclusion, it states that while jammers can be useful, how the technology is used is important.
Mobile jammers are devices that transmit signals to prevent cellular phones from receiving signals from base stations. They work by transmitting powerful radio frequencies that disrupt communication between phones and cell towers. There are different types of jamming techniques, including devices that transmit interfering signals (Type A), detect signals in quiet areas (Type B), function as beacons to disable phones (Type C), directly interact with phones (Type D), and use electromagnetic shielding (Type E). Mobile jammers have applications in maintaining silence in places like libraries, avoiding distractions in classrooms, and providing security in conferences. While jamming devices are illegal, companies are working on passive blocking technologies.
Cell phones are everywhere these days. According to the Cellular Telecommunications and Internet Association, approx. 1000 million people in India had cell-phone service.
Due to wide use of mobile phones it creates some problems as the sound of ringing becomes annoying or disrupting.
A cell phone jammer is a device that blocks transmission or reception of signals, usually by creating some form of interference at the same frequency ranges that cell phones use.
As a result, a cell phone user will either lose the signal or experience a significant loss of signal quality.
This document presents a project report on the design of a signal jammer. It was submitted by four students - Aryan Kumar, Karthikeyan R, M Aditya, and Nikhil Kumar - to Visvesvaraya Technological University in partial fulfillment of their Bachelor of Engineering degree in Electronics and Communication Engineering. The report provides background on signal jammers, their working mechanism, a literature survey on relevant technologies like GSM, and a detailed design of the jammer system implemented by the students including the power supply, IF section, RF section, and results of testing the jammer on different mobile networks in India.
This document discusses a student project to design a cell phone jammer with prescheduled time duration. It includes a block diagram of the jammer controller and describes how mobile jammers work by transmitting radio signals on the same frequencies used by mobile phones to disrupt communication between phones and cell towers. The goal of the project is to allow the jammer to be activated only during preset time periods to block phone signals in certain locations like exam halls.
Mobile phone jammers are devices that prevent cellular phones from receiving or sending signals to cell towers by transmitting radio waves on the same frequencies. They can block cell signals within a range of a few feet to several kilometers depending on the model. While they have legitimate uses like in prisons and military zones, mobile jammers are illegal to operate in many places due to safety and privacy concerns.
This document summarizes a seminar presentation on mobile phone jammers. It discusses the history of jammers originally being developed for law enforcement, and how jammers work by transmitting radio frequencies to disrupt communication between phones and towers. The document outlines different jamming techniques including intelligent disablers and passive shielding. It also discusses applications of jammers in limiting distractions and providing security, while noting disadvantages in blocking emergency communications. The conclusion examines both beneficial and problematic aspects of the technology.
Mobile phone intelligent jamming systemPatel Ibrahim
This document presents a project proposal for an intelligent mobile phone jamming system. The system is designed to prevent cell phones from operating in restricted areas in Jordan in a targeted manner. It aims to solve issues with non-intelligent jammers that block all mobile phones or the entire frequency band continuously. The intelligent jammer proposed works by detecting when a mobile phone is active in the restricted area and only then transmitting jamming signals to block that specific phone, avoiding disruption in other areas. The document outlines the system design and electronic circuits that will be implemented, including a mobile detector, frequency synthesizer, and power amplifier stages. It also discusses the software and microcontroller that will control the system.
A mobile phone jammer is a device that transmits signals on the same frequencies used by cell phones to disrupt communication between phones and cell towers. It works by causing interference that renders phones unusable within its range. The document discusses the history of jammers originally being developed for law enforcement, describes how jammers work by transmitting stronger signals to disrupt phone-tower frequencies, and lists some applications such as maintaining silence in libraries, exam halls, and providing security in meetings.
This handy, it can be used to prevent use of mobile phones in examination halls, confidential rooms and, etc. It is also useful for detecting the use of mobile phone for Spying and unauthorized video transmission. The circuit can detect the incoming calls pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. So and also outgoing calls, SMS and video transmissions even if the mobile phone is kept in the silent mode. The moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. The capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. we have to carefully solder the capacitor in standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. We are using a short telescopic type antenna. The unit will give the warning indication if someone uses Mobile phone within a radius of 1.5 meters.
This document describes a student project to build a cell phone jammer with a prescheduled time duration. It discusses using a PIC16F877A microcontroller to control a jammer circuit that can block GSM, DCS, and CDMA signals for a set period of time using real-time clock functionality. The project aims to allow users to select the cellular network and set the start and stop times for jamming through switches connected to the microcontroller.
This project report describes the development of a cellphone RF signal detector and jammer. The system uses a microcontroller to control a jammer and detector circuit. The jammer blocks cellphone signals within a defined range when activated, and the detector can sense activated cellphones from 1.5 meters away. The report includes the block diagram of the system, descriptions of the components, literature on jamming techniques and design parameters, schematics of the jammer and detector circuits, software used in development, and applications of the technology.
Project report of Cell phone detector circuitMoin Aman
This project report describes a cell phone detector circuit that can sense the presence of an activated mobile phone from 1.5 meters away. The circuit detects incoming/outgoing calls, SMS, and video transmission even if the phone is on silent. When it detects a signal, the circuit sounds an alarm and an LED blinks until the signal stops. The report provides the circuit diagram, component list, descriptions of key components like the CA3130 operational amplifier and NE555 timer, and discusses the basic concept and working of the detector by explaining how mobile phone signals are transmitted and can be picked up.
This document summarizes a seminar presentation on wirelessly charging mobile phones using microwaves. It discusses using a magnetron in the transmitter section to generate microwaves at 2.45 GHz, which are transmitted via a slotted waveguide antenna. In the receiver section, a sensor detects when a call is placed and a rectenna converts the microwave energy to DC power to charge the phone battery. Some advantages are wireless charging and potential to charge as long as a call is placed, while disadvantages include potential radiation issues and limited charging rates. The overall goal is to allow mobile phones to charge without wired connections.
There is great need to limit the use of cell phone at particular places
and at particular times. Hence, the use of intelligent cell phone detector is
guaranteed. This work concentrates in designing a system that will dictate the
presence of GSM signals from an unauthorized user in restricted areas which
will in turn trigger another device to restrict the user from service
This document describes the design and implementation of a GSM mobile phone jammer. It begins with an introduction to mobile jamming techniques and an overview of the requirements for a GSM jammer. It then details the design of the jammer, including the RF section with a voltage controlled oscillator, power amplifier, and antenna. It also describes the IF section and power supply. The document concludes that a jamming power of 34dBm is required to jam mobile phones within a 20m range and disrupt calls in the target area.
The mobile sniffer has three main stages:
1. A power supply stage that provides 12V and 5V power.
2. A detector stage that uses an antenna and op-amp circuit to detect signals from nearby mobile phones.
3. A controller stage that includes a microcontroller to process the detected signals and trigger an alarm.
This document proposes a system to automatically recharge mobile phones through microwave transmission as the phone is being used. The system would transmit microwave signals from an antenna along with voice signals. Mobile phones would require minor additions like a sensor, rectenna, and filter to receive the microwave energy and use it to charge the phone battery. This would eliminate the need for separate chargers and allow the phone to charge as it is being used through voice calls. Manufacturers could remove talk time and battery life from phone specifications as a result.
IRJET- Signal Jammer in Military OperationsIRJET Journal
The document discusses signal jammers used in military operations. It describes how signal jammers work by broadcasting radio frequencies to interfere with cell phone signals, preventing communication. The document outlines the components of a signal jammer, including a microcontroller, LCD display, transistors, and GSM modem. It provides circuit diagrams and discusses programming the microcontroller to control activation of the jammer. In testing, the jammer was able to block cell phone signals within a range of 3-4 meters. The document concludes the jammer could help isolate enemy posts and stop reinforcement communications, aiding military operations, while also mentioning future non-military uses of jammers.
This document is a project report submitted by students of the Electrical and Electronics Engineering department at SVS Group of Institutions. The project is about developing a mobile phone detector circuit. The circuit uses components like resistors, capacitors, transistors, LEDs, piezo buzzers, and ICs to detect incoming/outgoing calls, SMS, and video transmissions from an activated mobile phone within 1.5 meters. When a signal is detected, the circuit produces an alarm beep and LED blink until the signal stops. The report describes the circuit diagram and components used. It discusses how the circuit works and potential applications of the mobile phone detector.
This document discusses mobile phone jammers. It begins by explaining why mobile jammers are needed in certain settings like theaters and churches where calls can be disruptive. It then describes how jammers work by transmitting signals on the same frequencies as cell phones to disrupt communication between phones and towers. The main components of jammers are described as the voltage controlled oscillator, tuning circuit, noise generator, RF amplifier, and transmitting antenna. Different types of jamming techniques are outlined. Applications of jammers include maintaining silence in places like libraries, and avoiding disturbances in classrooms. However, the document notes that mobile jamming is illegal in many countries due to laws preventing interference with communications.
This document is a mini project report submitted by three students (Rahul Vaity, Sumedh Vartak, and Rohit Vasta) for their course on mini projects. It outlines their project to build a mobile phone detector circuit. The circuit uses an antenna to detect radio frequency signals from nearby mobile phones and triggers an alarm with a blinking LED. The report includes the circuit diagram, descriptions of the components used, and the basic working principle of how it detects mobile phones. It was submitted under the guidance of their professor Shripad Kulkarni.
Iaetsd advanced mobile signal jammer for gsm, cdma and 3 gIaetsd Iaetsd
This document describes the design and implementation of a mobile signal jammer that can block GSM, CDMA, and 3G networks for a prescheduled time duration using an ARM7 microcontroller. The jammer works by transmitting radio signals on the same frequencies used by mobile networks, interfering with communication between phones and towers. An RTC chip is used to program activation and deactivation times. When activated, phones will show "no network available". The jammer is controlled by an ARM7 microcontroller connected to an RTC, GSM modem, and jamming circuitry. The GSM modem notifies users before jamming begins. Mobile jammers are illegal in most countries due to security and privacy concerns.
This project report describes the design and development of a cell phone RF signal detector and jammer. It was created by four students under the guidance of an assistant professor. The report includes sections on the jamming technique, design parameters, hardware and software descriptions, and applications. The device uses a detector circuit to sense RF signals from mobile phones, which triggers a relay connected to a jammer circuit. The jammer circuit generates radio signals to interfere with communications between phones and cell towers within a 2m range.
The document discusses the history and design of cell phone jammers. It describes how cell phone jammers work by transmitting signals on the same frequencies used by cell phones, interfering with communication between phones and cell towers. The key components of jammers are described as the power supply, circuitry including an oscillator and amplifier to generate and boost the jamming signal, and an antenna to transmit it. More powerful jammers can disrupt cell signals within a radius of 30 feet up to 1 mile, depending on their output power level and the local environment.
The document describes the design and development of a mobile phone detector circuit. It begins with background information on the need for detecting mobile phones in restricted areas. It then discusses the history of mobile phone detection and technologies like GSM, 3G and 4G. The document provides an overview of the mobile phone detector project and explains the motivation was to prevent phone use in exams and confidential areas. It describes different detector designs and the basic components and workings of a detector circuit to identify activated phones from 1.5 meters away based on radio frequency signals.
Motorola solutions ap7131 access point installation guide wi ng 5.5 version...Advantec Distribution
This document provides installation instructions for the Motorola Solutions AP7131 and AP7131N Access Points. It describes unpacking the access point components, selecting an installation location considering antenna coverage, mounting options including wall, ceiling and above-ceiling mounting, connecting power and network cables, and configuring the access point LED indicators. The document also provides specifications for the access point models and regulatory compliance information.
This user guide provides instructions for connecting and using an Internet Phone Adapter with 2 ports for Voice over IP (VoIP). The guide includes:
1) An overview of the phone adapter's features and how to connect it to a network and phones/fax machines.
2) Details on the phone adapter's front and back panels and LED indicators.
3) Step-by-step instructions for physically connecting the phone adapter to a network and phone lines.
4) An explanation of how to access and use the phone adapter's interactive voice response menu to configure network settings using a phone's keypad.
The guide provides all the information needed to set up and operate the basic functions of the
This document proposes a method for wirelessly charging mobile phones using microwaves. It describes transmitting a microwave signal from an antenna at 2.45 GHz, the frequency detected by a sensor in the phone which activates a rectenna to convert the microwave energy into DC power to charge the phone battery. The transmitter uses a magnetron to generate high-power microwaves broadcast via a slotted waveguide antenna. Receivers would incorporate a simple sensor and rectenna array made of diodes to safely convert the wireless power for charging without cables. While promising convenience, concerns include potential health effects of radiation exposure and limited charging speeds.
This document is the user guide for the MSI-6260 Trans-Weigh crane scale system. It contains information on installation, operation, calibration, troubleshooting and specifications for the crane unit and indicator unit. The table of contents outlines the various sections and topics covered in the user guide.
Wireless Mobile Charging Using MicrowavesJishid Km
It is a hectic task to carry everywhere the charger of mobile phones or any electronic gadget while travelling, or it is very cruel when your mobile phone getting off by the time you urgently need it. It is the major problem in today’s electronic gadgets. Though the world is leading with the developments in technology, but this technology is still incomplete because of these limitations. Today’s world requires the complete technology and for this purpose here we are proposing the wireless charging of batteries using Microwaves.
Now in the recent days we come across some solutions for this problem by using the Witricity (Wireless Transmission of Electricity). Recently Nokia has launched Nokia Lumia 920 smart phones whose special feature is its wireless charging. But this is possible only when the device is placed on to the plate given for the wireless charging. So it is also somewhat difficult to travel with those charging plates. There may chance has forgetting the charging plates, and then we require something which can charge our electronic gadgets whenever they get used
The proposed method gives the solution for this problem. Once think that how it will be when your electronic gadget gets charged on using it? Then the label will come as “CHARGE ON USE”. This wireless charging method works on the principle of MICROWAVE OVEN. As the things when placed in microwave oven gets heated, in the same way these batteries should work using microwaves which are the medium of communication from long back. We are getting our network in terms of microwaves and it is proved that the total radiation coming from the cellular mobile communication is not been using and the remaining radiation is creating hazardous problem for human beings. So here we are working on the concept that why can’t we use those remaining radiations in order to charge our batteries? This will be the best solution to reduce the effect of radiation.
The document summarizes the design and implementation of a GSM mobile phone jammer. It was done by Ahmad Jisrawi and supervised by Dr. Nihad Dib at the Electrical Engineering Department of Jordan University of Science and Technology. The document discusses different mobile jamming techniques, the requirements for a GSM mobile jammer, and details the design including the RF section, IF section, and power supply. The overall purpose is to transmit signals on the same frequencies used by GSM systems to disable mobile phones in specific locations where ringing phones are disruptive, such as places of worship.
This document is the user guide for the TL-WA601G 108Mbps Wireless Access Point. It includes instructions for hardware installation, software configuration, and specifications for the device. The guide covers connecting the access point, configuring network settings, wireless settings like security and MAC filtering, and system tools for firmware, password changes, and more. It aims to easily guide users through setup and management of the wireless access point, whether familiar with networking devices or not.
In the rapidly evolving landscape of technologies, XML continues to play a vital role in structuring, storing, and transporting data across diverse systems. The recent advancements in artificial intelligence (AI) present new methodologies for enhancing XML development workflows, introducing efficiency, automation, and intelligent capabilities. This presentation will outline the scope and perspective of utilizing AI in XML development. The potential benefits and the possible pitfalls will be highlighted, providing a balanced view of the subject.
We will explore the capabilities of AI in understanding XML markup languages and autonomously creating structured XML content. Additionally, we will examine the capacity of AI to enrich plain text with appropriate XML markup. Practical examples and methodological guidelines will be provided to elucidate how AI can be effectively prompted to interpret and generate accurate XML markup.
Further emphasis will be placed on the role of AI in developing XSLT, or schemas such as XSD and Schematron. We will address the techniques and strategies adopted to create prompts for generating code, explaining code, or refactoring the code, and the results achieved.
The discussion will extend to how AI can be used to transform XML content. In particular, the focus will be on the use of AI XPath extension functions in XSLT, Schematron, Schematron Quick Fixes, or for XML content refactoring.
The presentation aims to deliver a comprehensive overview of AI usage in XML development, providing attendees with the necessary knowledge to make informed decisions. Whether you’re at the early stages of adopting AI or considering integrating it in advanced XML development, this presentation will cover all levels of expertise.
By highlighting the potential advantages and challenges of integrating AI with XML development tools and languages, the presentation seeks to inspire thoughtful conversation around the future of XML development. We’ll not only delve into the technical aspects of AI-powered XML development but also discuss practical implications and possible future directions.
AI 101: An Introduction to the Basics and Impact of Artificial IntelligenceIndexBug
Imagine a world where machines not only perform tasks but also learn, adapt, and make decisions. This is the promise of Artificial Intelligence (AI), a technology that's not just enhancing our lives but revolutionizing entire industries.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Full-RAG: A modern architecture for hyper-personalizationZilliz
Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Threats to mobile devices are more prevalent and increasing in scope and complexity. Users of mobile devices desire to take full advantage of the features
available on those devices, but many of the features provide convenience and capability but sacrifice security. This best practices guide outlines steps the users can take to better protect personal devices and information.
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
Join HCL Ambassador Marc Thomas in this webinar with a special guest appearance from Franz Walder. It will give you the tools and know-how to stay on top of what is going on with Domino licensing. You will be able lower your cost through an optimized configuration and keep it low going forward.
These topics will be covered
- Reducing license cost by finding and fixing misconfigurations and superfluous accounts
- How do CCB and CCX licenses really work?
- Understanding the DLAU tool and how to best utilize it
- Tips for common problem areas, like team mailboxes, functional/test users, etc
- Practical examples and best practices to implement right away
How to Get CNIC Information System with Paksim Ga.pptxdanishmna97
Pakdata Cf is a groundbreaking system designed to streamline and facilitate access to CNIC information. This innovative platform leverages advanced technology to provide users with efficient and secure access to their CNIC details.
Why You Should Replace Windows 11 with Nitrux Linux 3.5.0 for enhanced perfor...SOFTTECHHUB
The choice of an operating system plays a pivotal role in shaping our computing experience. For decades, Microsoft's Windows has dominated the market, offering a familiar and widely adopted platform for personal and professional use. However, as technological advancements continue to push the boundaries of innovation, alternative operating systems have emerged, challenging the status quo and offering users a fresh perspective on computing.
One such alternative that has garnered significant attention and acclaim is Nitrux Linux 3.5.0, a sleek, powerful, and user-friendly Linux distribution that promises to redefine the way we interact with our devices. With its focus on performance, security, and customization, Nitrux Linux presents a compelling case for those seeking to break free from the constraints of proprietary software and embrace the freedom and flexibility of open-source computing.
GraphSummit Singapore | The Future of Agility: Supercharging Digital Transfor...Neo4j
Leonard Jayamohan, Partner & Generative AI Lead, Deloitte
This keynote will reveal how Deloitte leverages Neo4j’s graph power for groundbreaking digital twin solutions, achieving a staggering 100x performance boost. Discover the essential role knowledge graphs play in successful generative AI implementations. Plus, get an exclusive look at an innovative Neo4j + Generative AI solution Deloitte is developing in-house.
Removing Uninteresting Bytes in Software FuzzingAftab Hussain
Imagine a world where software fuzzing, the process of mutating bytes in test seeds to uncover hidden and erroneous program behaviors, becomes faster and more effective. A lot depends on the initial seeds, which can significantly dictate the trajectory of a fuzzing campaign, particularly in terms of how long it takes to uncover interesting behaviour in your code. We introduce DIAR, a technique designed to speedup fuzzing campaigns by pinpointing and eliminating those uninteresting bytes in the seeds. Picture this: instead of wasting valuable resources on meaningless mutations in large, bloated seeds, DIAR removes the unnecessary bytes, streamlining the entire process.
In this work, we equipped AFL, a popular fuzzer, with DIAR and examined two critical Linux libraries -- Libxml's xmllint, a tool for parsing xml documents, and Binutil's readelf, an essential debugging and security analysis command-line tool used to display detailed information about ELF (Executable and Linkable Format). Our preliminary results show that AFL+DIAR does not only discover new paths more quickly but also achieves higher coverage overall. This work thus showcases how starting with lean and optimized seeds can lead to faster, more comprehensive fuzzing campaigns -- and DIAR helps you find such seeds.
- These are slides of the talk given at IEEE International Conference on Software Testing Verification and Validation Workshop, ICSTW 2022.
Goodbye Windows 11: Make Way for Nitrux Linux 3.5.0!SOFTTECHHUB
As the digital landscape continually evolves, operating systems play a critical role in shaping user experiences and productivity. The launch of Nitrux Linux 3.5.0 marks a significant milestone, offering a robust alternative to traditional systems such as Windows 11. This article delves into the essence of Nitrux Linux 3.5.0, exploring its unique features, advantages, and how it stands as a compelling choice for both casual users and tech enthusiasts.
Unlock the Future of Search with MongoDB Atlas_ Vector Search Unleashed.pdfMalak Abu Hammad
Discover how MongoDB Atlas and vector search technology can revolutionize your application's search capabilities. This comprehensive presentation covers:
* What is Vector Search?
* Importance and benefits of vector search
* Practical use cases across various industries
* Step-by-step implementation guide
* Live demos with code snippets
* Enhancing LLM capabilities with vector search
* Best practices and optimization strategies
Perfect for developers, AI enthusiasts, and tech leaders. Learn how to leverage MongoDB Atlas to deliver highly relevant, context-aware search results, transforming your data retrieval process. Stay ahead in tech innovation and maximize the potential of your applications.
#MongoDB #VectorSearch #AI #SemanticSearch #TechInnovation #DataScience #LLM #MachineLearning #SearchTechnology
Infrastructure Challenges in Scaling RAG with Custom AI modelsZilliz
Building Retrieval-Augmented Generation (RAG) systems with open-source and custom AI models is a complex task. This talk explores the challenges in productionizing RAG systems, including retrieval performance, response synthesis, and evaluation. We’ll discuss how to leverage open-source models like text embeddings, language models, and custom fine-tuned models to enhance RAG performance. Additionally, we’ll cover how BentoML can help orchestrate and scale these AI components efficiently, ensuring seamless deployment and management of RAG systems in the cloud.
2. Mobile Jammer
Seminar
Submitted in partial fulfillment of the requirements
For the degree of
Bachelor of Technology in Information Technology
By
Ranavasiya Mehul
10BIT047
Department Of Computer Science and Engineering
Institute Of Technology
Nirma University
Ahmedabad-382481
April 2013
3. iii
Certificate
This is to certify that the Seminar entitled ”Mobile Jammer” submitted by Ranavasiya
Mehul(10BIT047), towards the partial fulfillment of the requirements for the degree of
Bachelor of Technology in Information Technology of Nirma University, Ahmedabad
is the record of work carried out by him under my supervision and guidance. In
my opinion, the submitted work has reached a level required for being accepted for
examination. The results embodied in this Seminar, to the best of my knowledge,
haven’t been submitted to any other university or institution for award of any degree
or diploma.
Prof. Jitali Patel Prof. Pimal Khanpara
Assistant Professor, Assistant Professor,
CSE Department , CSE Department,
Institute of Technology, Institute of Technology,
Nirma University, Ahmedabad Nirma University, Ahmedabad
Dr. Sanjay Garg
Head Of Department,
CSE Department,
Institute of Technology,
Nirma University, Ahmedabad
4. iv
Abstract
The last few years have witnessed a dramatic boom in the wireless communications
industry, hence increasing the number of users of mobile communication devices. This
magnified the need for a more efficient and reliable signal scrambler. This paper deals
with the Mobile Jamming Technology. A mobile Jammer is an instrument which is
used to prevent mobile phones from receiving signals from the base stations.Which
can be used in practically at any location, but are mostly found in places where a
phone call would be particularly disruptive because silence is expected.The concept of
jamming technology is studied in a step-by-step approach. Those steps include Intro-
duction to mobile jammer, Componets of mobile jammer, Mobile jamming techniques,
Design parameters for mobile jammer, Block diagram of mobile jammer and Legal
issues related with mobile jammer along with the Alternatives of mobile jammer.
5. v
Acknowledgements
I would like to express my special thanks of gratitude to my guide Prof. Pimal
Khanpara who gave me the golden opportunity to give her profound guidance in
this wonderful project on the Mobile jammer , which also helped me in doing a lot
of Research and i came to know about so many new things.I am really thankful to
them.
- Ranavasiya Mehul
10BIT047
8. Chapter 1
Introduction
1.1 Why mobile jammer is needed?
It’s great to be able to call anyone at anytime. Unfortunately, restaurants, movie
theaters, concerts, shopping malls and churches all suffer from the spread of cell
phones because not all cell-phone users know when to stop talking. Who hasn’t
seethed through one side of a conversation about an incredibly personal situation
as the talker shares intimate details with his friend as well as everyone else in the
area?? While most of us just grumble and move on, some people are actually going
to extremes to retaliate. Cell phones are basically handheld two-way radios. And like
any radio, the signal can be disrupted, or jammed.
A mobile Jammer is an instrument which is used to prevent mobile phones from
receiving signals from the base stations.Which can be used in practically at any
location, but are mostly found in places where a phone call would be particularly
disruptive because silence is expected.
1.2 Cell Phone Jamming Basics
Disrupting a cell phone is the same as jamming any other type of radio commu-
2
9. CHAPTER 1. INTRODUCTION 3
nication. A cell phoneworks by communicating with its service network through a
cell tower or base station. Cell towers divide a city into small areas, or cells. As
a cell-phone user drives down the street, the signal is handed from tower to tower.
A jamming device transmits on the same radio frequencies as the cell phone, dis-
rupting the communication between the phone and the cell-phone base station in the
tower. It’s a called a denial-of-service attack. The jammer denies service of the radio
spectrumto the cell-phone users within range of the jamming device.
10. Chapter 2
Components of Mobile Jammer
Components of a mobile jammer include:
• Voltage Controlled Oscillator(VCO)
• Tuning Circuit
• Noise Source
• RF Amplification Unit
• Transmitting Antenna
2.1 Voltage Controlled Oscillator(VCO)
VCO is the most important among other parts. It is like a heart of our jammer. VCO’s
can be built using op-amps, resistors and capacitors, but the low cost, availability
and reliability of prefabricated VCO’s make it optimum to just purchase it. VCO
produces RF signal which will interact with the blocked device. Firstly we must select
frequencies which will be used in our signal blocking device. It is also important to
think about its size because we might wish to create a desktop mobile phone jammer
or a portable handheld jamming device.
4
11. CHAPTER 2. COMPONENTS OF MOBILE JAMMER 5
Figure 2.1: Voltage Controlled Oscillator
2.2 Tuning Circuit
Tuning Circuit can be of two types:
• open-loop
• feedback
Open-loop is quite simple and requires just a few op-amps with additional passive
components.It is a sawtooth-wave generator which makes VCO to go from lowest
to highest frequency. The feedback is using PLL to adjust the VCOs frequency
constantly. For this purpose we need to use microcontroller. It is programmed once
and then connected to the VCO, thus it is not adjustable.
2.3 Noise generator
Produces random electronic output in a specified frequency range to jam the cell-
phone network signal (part of the tuning circuit).
2.4 RF Amplification Unit
RF Amplification Unit is what we need when we wish to increase the area covered
by our jammer along with its signal blocking power. The more power has our signal
blocker, the bigger radius it jams. The cost is, as we may guess, battery working
time. More power equals less time for battery to live.
12. CHAPTER 2. COMPONENTS OF MOBILE JAMMER 6
Figure 2.2: Transmitting Antenna
2.5 Transmitting Antenna
Transmitting Antenna is a tool which transmits signals produced by your jammer.
The main characteristic of antenna is VSWR (Voltage Standing Wave Ratio). If your
antenna has VSWR of 3 or lower, then this is what you need, because the return loss
of this antenna is minimal.
VSWR: For example, the VSWR value 2:1 denotes a maximum standing wave
amplitude that is 2 times greater than the minimum standing wave value.
Generally we use SMA antennas due to their ability of being removed or replaced
easily. It is worth to mention that omnidirectional antennas are preferable, unless..
we like to use our cell phone jammer in a TV remote style!!
SMA (SubMiniature version A) connectors are coaxial RF connectors developed in
the 1960s as a minimal connector interface for coaxial cable with a screw type cou-
pling mechanism.
2.6 Power Source
Power Source makes our creation to become alive. Generally mobile phone jammers
use 5VDC to operate. Thus you may use Lithium-ion battery to supply our creation.
In the case of using common power source we will need power adapter. The power
13. CHAPTER 2. COMPONENTS OF MOBILE JAMMER 7
adapter may be of one of two types: switched-capacitor voltage doubler or inductor-
based boost regulator. The first one is simple and efficient yet not regulated solution,
so we will need LDO regulator to fix the voltage. The second one is regulated but it
has bigger cost, more complex and requires precise specification of all components to
work properly
14. Chapter 3
Mobile Jamming Techniques
There are various types of jamming devices available which are using different jam-
ming techniques.
• Type ”A” Device
• Type ”B” Device
• Type ”C” Device
• Type ”D” Device
• Type ”E” Device
3.1 Type ”A” Device
Type ”A” Devices are simple Jammer.This type of device comes equipped with several
independent oscillators transmitting jamming signals capable of blocking frequencies
used by paging devices as well as those used by cellular systems control channels for
call establishment.
8
15. CHAPTER 3. MOBILE JAMMING TECHNIQUES 9
3.2 Type ”B” Device
Type ”B” Devices are also known as INTELLIGENT CELLULAR DISABLERS.
Unlike jammers, Type B devices do not transmit an interfering signal on the control
channels. The device, when located in a designated quite area, functions as a detector.
It has a unique identification number for communicating with the cellular base station
3.3 Type ”C” Device
Type ”C” Devices are also known as Intelligent Beacon Disablers. Unlike jammers,
Type C devices do not transmit an interfering signal on the control channels. The
device, when located in a designated quiet area, functions as a beacon and any com-
patible terminal is instructed to disable its ringer or disable its operation, while within
the coverage area of beacon.
3.4 Type ”D” Device
Type ”D” Devices are Direct Receive Transmit Jammers. This jammer behaves like
a small, independent and portable base station, which can directly interact intelli-
gently or unintelligently with the operation of the local mobile phone. The jammer
is predominantly in receive mode and will intelligently choose to interact and block
the cell Phone directly if it is within close proximity of the jammer.
3.5 Type ”E” Device
Type ”E” Devices are used for EMI Shield - Passive Jamming. This technique is
using EMI suppression techniques to make a room into what is called Faraday cage.
Although labor intensive to construct, the Faraday cage essentially Blocks or greatly
attenuates, virtually all electromagnetic radiation from entering or leaving the cage -
or in this case a target room.
16. Chapter 4
Design Parameters/ Specification
of mobile jammer
There are various types of jamming devices available which are using different jam-
ming techniques.
• The frequency bands
• Distance to be jammed (D)
• Jamming-to-signal ratio J/S
• Power calculations
• Free space loss
The Jamming Coverage Area for a particular model jammer should be consid-
ered a General or typical area of coverage. The situation may vary and is specific
to the site. Every JAMMING DEVICE outputs a JAMMING SIGNAL on one or
more frequencies at a particular OUTPUT POWER. The OUTPUT POWER of the
JAMMER will typically be stated in WATTS or in some Cases DBM, (decibels per
meter), or both. The OUTPUT POWER correlates generally to the COVERAGE
AREA that the JAMMER will provide an Effective blocking or JAMMING signal.
10
17. CHAPTER 4. DESIGN PARAMETERS/ SPECIFICATION OF MOBILE JAMMER11
However, because many factors affect both cellular phone Reception and jamming
efficiency the advertised or sated AREA of COVERAGE may be more or less than
What a manufacture states.
In most cases a JAMMER will be easier to implement and more effective indoors.
In urban settings and In high-rise buildings, a jammer will typically be more effective
on lower floors. This is because the Building and surrounding structures diminish
the cellular signal. In some cases a JAMMER will be more Effective when placed
on the side of a room or building which is closest to a cellular tower. And in other
Cases a JAMMER may be more effective when placed by a window or door. The
design of a jammer design begins with a desired area of coverage as it correlates to
a particular Frequency. Jammers like all radio devices operate according to certain
laws of physics and energy. The Jamming objective is to inject an interference signal
into the communications frequency so that the Actual signal is completely submerged
by the interference. It is important to notice that transmission can never be totally
jammed - jamming hinders the reception at the other end. The problem here for
the jammer is that only transmitters can be found using direction finding and the
Location of the target must be a specific location, usually where the jammer is located
and this is Because the jamming power is never infinite.
Jamming is successful when the jamming signal denies the usability of the commu-
nications transmission. In digital communications, the usability is denied when the
error rate of the transmission Cannot be compensated by error correction. Usually a
successful jamming attack requires that the jammer power is roughly equal to signal
power at the receiver. The effects of jamming depend on the, Jamming-to-signal ratio
(J/S) , Modulation scheme, Channel coding and Interleaving of the target system.
Generally Jamming-to-Signal ratio can be measured according to the following Equa-
tion.
Where:
Pj = jammer power
Pt = transmitter power
18. CHAPTER 4. DESIGN PARAMETERS/ SPECIFICATION OF MOBILE JAMMER12
Figure 4.1: J/S Ratio
Gjr = antenna gain from jammer to receiver
Grj = antenna gain from receiver to Jammer
Gtr = antenna gain from transmitter to receiver
Grt = antenna gain from receiver to transmitter
Br = communications receiver bandwidth
Bj = jamming transmitter bandwidth
Rtr = range between communications transmitter and receiver
Rjt = range between jammer and communications receiver
Lj = jammer signal loss (including polarization mismatch)
Lr = communication signal loss
The above Equation indicates that the jammer Effective Radiated Power, which is
the product of Antenna gain and output power, should be high if jamming efficiency is
required. On the other hand, in Order to prevent jamming, the antenna gain toward
the communication partner should be as high as Possible while the gain towards
the jammer should be as small as possible. As the equation shows, the Antenna
pattern, the relation between the azimuth and the gain, is a very important aspect in
jamming. Also as we know from Microwave and shown in the equation distance has
a strong influence on the Signal loss. If the distance between jammer and receiver
is doubled, the jammer has to quadruple its Output in order for the jamming to
have the same effect. It must also be noted here that jammer path Loss is often
different from the communications path loss; hence giving the jammer an advantage
over Communication transmitters.
19. Chapter 5
Block Diagram of Mobile Jammer
There are main 4 sections in the block diagram of mobile jammer.
5.1 Power Supply
The mobile jammer was designed for fixed use, and to take its power from the regular
220V AC wall outlets. The IF RF sections of the jammer require +5, +9, and -9 DC
Voltages. So a dc-dual polarity power supply should be designed. The basic parts for
a power supply are rectifier, filter, and regulator. The rectifier coverts the ac input
voltage to a pulsating dc voltage and can be either half wave rectifier and full wave
rectifier, the one we use is the full wave rectifier which has the advantage that it allows
unidirectional current to the load during the entire cycle of the input voltage and the
Figure 5.1: Block diagram
13
20. CHAPTER 5. BLOCK DIAGRAM OF MOBILE JAMMER 14
Figure 5.2: Power Suppy
Figure 5.3: IF Section
result of the full wave rectification is an output voltage with a frequency twice the
input frequency that pulsated every half-cycle of the input. The second part of the
power supply is the filter which eliminate the fluctuations in the output of the full
wave rectifier so as to produce a constant dc voltage, the filter is simply a capacitor
and its chosen to be as large as possible to minimize voltage ripple in the output. The
final part of the power supply is the regulator and it is used to provide the desired
constant dc output that is basically independent of the input voltage. Single chip
regulators were used to give +5, +9, and -9 dc voltages
21. CHAPTER 5. BLOCK DIAGRAM OF MOBILE JAMMER 15
Figure 5.4: RF Section
5.2 IF Section
The function of the IF-section of the Mobile jammer is to generate the tuning signal
for the VCO in The RF-Section, which will sweep the VCO through the desired range
of frequencies. This tuning signal is generated by a triangular wave generator along
with noise generator, and then offset by proper amount so as to sweep the VCO
output from the minimum desired frequency to a maximum. The triangle wave and
noise signals are mixed using Op-Amp configured as summer. Then a DC voltage is
added to the resulted signal to obtain the required tuning voltage.
5.3 RF Section
The RF-section is the most important part of the mobile jammer it consist of the
Voltage Controlled Oscillator (VCO), RF Power amplifiers, and the antenna. These
components were selected according to the desired specification of the jammer such
as the frequency range and the coverage range.
22. Chapter 6
Applications
There are various types of jamming devices available which are using different jam-
ming techniques.
• To maintain the complete silence in library and lecture hall.
• To avoid fraud in examination hall.
• To avoid disturbance in class room.
• For providing security in business conference, board of directors rooms, semi-
nars, etc.
• For providing calm and peaceful atmosphere in Hospitals.
• Church/Mosques/Cathedral/Temple/Religious establishment
Cell phone jamming devices were originally developed for law enforcement and the
military to interrupt communications by criminals and terrorists. The bombs that
blew up commuter trains in Spain in March 2004, as well as blasts in Bali in October
2002 and Jakarta in August 2003, all relied on cell phones to trigger explosives. It has
been widely reported that a cell-phone jammer thwarted an assassination attempt on
Pakistani President Musharraf in December 2003. When President Bush visited Lon-
don in November 2004, it was reported that British police considered using jammers
16
23. CHAPTER 6. APPLICATIONS 17
to protect the president’s motorcade through London. During a hostage situation,
police can control when and where a captor can make a phone call. Police can block
phone calls during a drug raid so suspects can’t communicate outside the area. Cell-
phone jammers can be used in areas where radio transmissions are dangerous, (areas
with a potentially explosive atmosphere), such as chemical storage facilities or grain
elevators. The TRJ-89 jammer from Antenna System Supplies Inc. carries its own
electrical generator and can block cellular communications in a 5-mile (8-km) radius.
Corporations use jammers to stop corporate espionage by blocking voice transmis-
sions and photo transmissions from camera phones. On the more questionable end of
the legitimacy spectrum, there are rumors that hotel chains install jammers to block
guests’ cell-phone usage and force them to use in-room phones at high rates.
24. Chapter 7
Legal Issues and Alternatives of
Cell Phone Jamming
7.1 Cell Phone Jamming Legal Issues
In the United States, United Kingdom, Australia and many other countries, blocking
cell-phone services (as well as any other electronic transmissions) is against the law.
In the United States, cell-phone jamming is covered under the Communications Act
of 1934, which prohibits people from ”willfully or maliciously interfering with the
radio communications of any station licensed or authorized” to operate. In fact, the
”manufacture, importation, sale or offer for sale, including advertising, of devices
designed to block or jam wireless transmissions is prohibited” as well. Jamming
is seen as property theft, because a private company has purchased the rights to
the radio spectrum, and jamming the spectrum is akin to stealing the property the
company has purchased. It also represents a safety hazard because jamming blocks
all calls in the area, not just the annoying ones. Jamming a signal could block the call
of a babysitter frantically trying to contact a parent or a someone trying to call for
an ambulance. The Federal Communications Commission is charged with enforcing
jamming laws. However, the agency has not yet prosecuted anyone for cell-phone
18
25. CHAPTER 7. LEGAL ISSUES AND ALTERNATIVES OF CELL PHONE JAMMING19
jamming.
7.2 Alternatives to Cell Phone Jamming
While the law clearly prohibits using a device to actively disrupt a cell-phone signal,
there are no rules against passive cell-phone blocking. That means using things
like wallpaper or building materials embedded with metal fragments to prevent cell-
phone signals from reaching inside or outside the room. Some buildings have designs
that block radio signals by accident due to thick concrete walls or a steel skeleton.
Companies are working on devices that control a cell phone but do not ”jam the
signal.” One device sends incoming calls to voicemail and blocks outgoing calls. The
argument is that the phone still works, so it is technically not being jammed. It is a
legal gray area that has not been ruled on by the FCC as of Apr-+il 2005. Cell-phone
alerters are available that indicate the presence of a cell-phone signal. These have
been used in hospitals where cell-phone signals could interfere with sensitive medical
equipment. When a signal is detected, users are asked to turn off their phones. For a
less technical solution, Coudal Partners, a design firm in Chicago, has launched the
SHHH, the Society for HandHeld Hushing. At its Web site, you can download a note
to hand to people conducting annoying cell-phone conversations, expressing your lack
of interest in what they’re talking about.
26. Chapter 8
Conclusion
8.1 Conclusion
At last we can say every device is acts as good aspects as well as bad aspects. In
many place cell phone jammer is useful but at many place it is a problem .for this we
can take a example that if at any place cell phone jammer is on than anybody wants
to use than there creates some problems. But its overall performance is very good
and helpful in our life.
8.2 References
• www.HowStuffWork.com
• wikipedia.org/wiki/Mobilephonejammer
• Mobile Personal Communications Committee of the Radio Advisory Board of
Canada, Use of jammer and disabler Devices for blocking PCS, Cellular Related
Services
• http://whatisacellphonejammer.com
• http://blog.jammer-store.com/2009/11/how-mobile-jammers-work
20