mutli jammer

Multi Jammer

Greater Noida institute of Technology, Greater Noida 1

CHAPTER 1

RADIO JAMMER

1.1 Introduction

A wireless signal jammer is a device which blocks transmission by

creating interference. This wireless signal jammer can be categorized into

the Radio Frequency (RF) jammer and GSM jammer. A Radio Frequency

jammer is a device used to disrupt or prevent communication via a

broadcasted RF signal. It is an RF and GSM frequency disrupter

commonly known as wideband radio frequency (RF) and GSM cell phone

jammer. Simultaneously, they can blocks all commercial FM broadcast

band (87.5 MHz to 108 MHz) and GSM signal transmissions within the

jammer's transmission range. The device can possibly block these

frequencies by transmitting a dirty signal (like noise) on the same

frequency at which the GSM and radio system operates. A Radio

Frequency jammer is a device that transmits a radio frequency signal on

the same frequency at which the radio system operates and the jamming

succeeds when the radio sets in the area where the jammer is located are

disabled. A GSM jammer is a device that transmits a signal on the same

frequency at which the GSM operates. The jamming succeeds when the

mobile phones in the area where the jammer is located are disabled. In

recent times, where bombs are being planted and detonated by GSM or

Radio Frequency signals, this device can be at an advantage by jamming

the signals required for the detonation of the bomb.

Presently, the mobile jammer devices are becoming civilian products

rather than electronic warfare devices, since with the increasing number

of the mobile phone users the need to disable mobile phones in specific

places where the ringing of cell phone would be disruptive has increased.

These places include worship places, university lecture rooms, libraries,

concert halls, meeting rooms, and other places where silence is

Multi Jammer


appreciated the solution to these annoying and disrupting noises is to

install a device which can block the signal transmission from mobile

phones and radio sets and thus, disrupt the triggering of bombs by these

wireless signals.

1.2 Background

The technology being used by this device is very simple. The mobile

phone transmission is being blocked and interfered by RF which creates

high noise. The frequency being generated by the jamming device jams

the signal being generated by the cell tower (as illustrated in figure 1.1

below). When the signal has been blocked, the mobile phone will show

“NO NETWORK” on the network bar, and radio devices will not be able

to tune into any signal. A GSM jammer transmits on the same airwaves

that cell phones do. When the jammer is activated, it is able to disrupt the

signal between the cell phone and the nearest tower. Because the GSM

jammer and the cell phone use the same frequency, they effectively

cancel the other signal. Thus, all phones and radio devices in the 200m

radius of the jammer will be having the same situation. Radio Frequency

(RF) and Mobile signal jammer is an illegal device in many countries. It

is because the device is blocking the signal which has been approved by

government agency as a legal communication transmission system. Cell

phones are everywhere these days. To the Cellular Telecommunications

and Internet Association, almost 195 million people in the United States

had cell-phone service in October 2005. And cell phones are even more

ubiquitous in Europe. According to the National Communications

Commission (NCC) in Nigeria, “The manufacture, importation, sale, or

offer for sale, of devices designed to block or jam wireless transmission is

prohibited”. The reason I am developing this device is for educational

purpose only. This device was developed and tested in this report just for

Final Year Project presentation. There is no intention of manufacturing or

selling such device in Nigeria or elsewhere.

Multi Jammer


Figure 1.1:Block diagram of RF signal jammer

The block diagram in Fig. 1.2 below gives a pictorial representation of

the working principle of a wireless signal jammer -

Figure 1.2 : Working principle of wireless signal jammer

Fig. 1.2, the jamming device jams cell phones and radio sets within the

range of cell towers 1 and 2. The cell tower 1, 2, 3 and 4 transmits signals

which can be received by GSM or radio sets. The jamming device is

placed in-between cell towers 1 and 2 and thus produces a signal which is

at the same frequency being operated /transmitted by the cell tower. It can

be said that the resultant of the signals is zero. From Fig. 1.2, the sending

RADIO

FREQUENCY

SIGNAL

JAMMER

GSM SIGNAL

JAMMER (935-

960MHz)

RADIO

FREQUENCY

RECEIVER

SIGNAL

JAMMER (87.5-

108 MHz)

AMPLITUDE

MODULATED

SIGNAL

Multi Jammer


object is the jamming device and the target object is the cell towers.

However, mobile phones placed within the range of cell towers 3 and 4

will not be jammed due to the fact that they are not within the range of

the jamming device.

1.3 Problem

Statement Due to the increasing sophistication and high technology, most

people are using mobile phones, and also due to the need for man to stay

updated with his environment, the use of radio is also in wide use. Mobile

phones have become a very important communication tool today. With

the use of the mobile phones everywhere, it becomes annoying device

while working, studying, praying and many more. Modern technology

has contributed to the sophistication of bombs which are being triggered

by GSM and Radio signals. Wireless mobile jammer can be placed in

schools, mosque, and conference hall, meeting rooms, library and many

more places which need quiet and peaceful environment. This device will

block the transmission of Radio and GSM signals.

In the construction of this wireless signal jammer, the device will be

able to jam GSM and Radio Frequency (RF) signals and this can be done

alternatively through a switch. The radio receiver jammer is also sub-

divided into the Amplitude Modulated (AM) signal jammer and the

Frequency Modulated (FM) Signal jammer.

1.4 Objectives

The Development of Wireless Signal Jammer for Security Application

objective is:

To design Radio Frequency (RF),

Intermediate Frequency (IF), and Power Supply circuit.

To construct the Development of Wireless Signal Jammer

for Security Application’s circuit.

To construct the development of wireless signal jammer for

security application’s circuit.

Multi Jammer


To simulate Intermediate Frequency (IF) section circuit. To

block mobile phones transmission by creating interference to

block amplitude modulated and frequency modulated signal

transmission by creating interference within its range.

Scope of Project /Limitation

This project only focuses on blocking the signal transmission of GSM900

which is the range between 935 to 960 MHz. This is because the

components are hard to find in Nigeria for the GSM1800 frequency range

between 1805 to 1880 MHz the components for GSM1800 are also very

expensive compared to GSM900.

The second limitations of the project are, the device only can block

three main operators which are ETISALAT, MTN and GLOBACOM.

This is because, the lines are only for Nigerian users and the frequency

band range is between 935 to 960 MHz. These requirements fulfil the

GSM900 specifications. The third limitation is that for reliability of the

jammer, a Radio Frequency amplifier should be incorporated but the

components required for this are difficult to find in Nigeria.

1.5 Summary

This project is mainly intended to prevent the usage of mobile phones in

places inside it coverage without interfering with communication

channels outside it range, thus providing a cheap and reliable method for

blocking mobile communication in the required restricted area only.

Although we must be aware of the fact that nowadays lot of mobile

phones can easily negotiate the jammer effect are available and therefore

advance measures should be taken to jam such type of devices.

Multi Jammer


CHAPTER 2

LITERATURE REVIEW

2.1 Introduction

This chapter will discuss more about all of the information related to the

project. It discusses about the previous history and the present work about

my project. The literature review in this paper is based on Internet,

journal, books, and articles.

2.2 History of RF/ GSM jammer

Communication jamming devices were first developed and used by

military. This interest comes from the fundamental area of denying the

successful transport of the information from the sender to the receiver.

Nowadays the mobile jammer devices are becoming civilian products

rather than electronic warfare devices, since with the increasing number

of the mobile phone users the need to disable mobile phones in specific

places where the ringing of cell phone would be disruptive has increased.

These places include worship places, university lecture rooms, libraries,

concert halls, meeting rooms, and other places where silence is

appreciated.

2.3 Operation

Jamming devices overpower the cell phone by transmitting a signal on

the same frequency as the cell phone and at a high enough power that the

two signals collide and cancel each other out. Cell phones are designed to

add power if they experience low-level interference, so the jammer must

recognise and match the power increase from the phone. Cell phones are

full-duplex devices which mean they use two separate frequencies, one

for talking and one for listening simultaneously. Some jammers block

only one of the frequencies used by cell phones, which has the effect of

blocking both. The phone is tricked into thinking there is no service

Multi Jammer


because it can receive only one of the frequencies. Less complex devices

block only one group of frequencies, while sophisticated jammers can

block several types of networks at once to head off dual- mode or trimode

phones that automatically switch among different network types to find

an open signal. Some of the high-end devices block all frequencies at

once and others can be tuned to specific frequencies.

To jam a cell phone, all you need is a device that broadcasts on the

correct frequencies. Although different cellular systems process signals

differently, all cell phone networks use radio signals that can be

interrupted. GSM, used in digital cellular operates in the 900-MHz and

1800-MHz bands in Europe and Asia and in the 1900-MHz (sometimes

referred to as 1.9-GHz) band in the United State. Old- fashioned analogue

cell phones and today’s digital devices are equally susceptible to

jamming. Disrupting a cell phone is the same as jamming any other type

of radio communication. A cell phone works 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 frequency as the cell

phone, which is 900MHz, thereby disrupting the communication between

the phone and the cell-phone base station in the town. This is called a

denial-of-service attack. The jammer denies service of the radio spectrum

to the cell phone users within range of the jamming device. Older

jammers sometimes were limited to working on phones using only

analogue or older digital mobile phone standards. Newer models such as

the double and triple band jammers can block all widely used systems and

are even very effective against newer phones which hop to different

frequencies and systems when interfered with. As the dominant network

technology and frequencies used mobile phones vary worldwide, some

work only in specific regions such as Europe or North America. The

power of the jammer’s effect can vary widely based on factors such as

proximity to towers, indoor and outdoor settings, presence of buildings

and landscape, eve temperature and humidity play a role. There are

concerns that crudely designed jammers may disrupt the functioning of

medical devices such as pacemakers. However, like cell phones, most of

Multi Jammer


the devices in common use operate at low enough power output (less than

one watt) to avoid causing any problems.

2.4 Previous Work

The rapid proliferation of mobile phones at the beginning of the 21st

century to near ubiquitous/ever present status eventually raised problems

such as their potential use to invade privacy or contribute to rampant and

egregious academic cheating. In addition public backlash was growing

against the intrusive disruption cell phones introduced in daily life. While

older analogue mobile phones often suffered from chronically poor

reception and could even be disconnected by simple interference such as

high frequency noise, increasingly sophisticated digital phones have led

to more elaborate counters. Mobile phone jamming devices are an

alternative to more expensive measures against mobile phones, such as

Faraday cages, which are mostly suitable as built in protection for

structures. They were originally developed for law enforcement and the

military to interrupt communications by criminals and terrorists. Some

were also designed to foil the use of certain remotely detonated

explosives. The civilian applications were apparent, so over time many

companies originally contracted to design jammers for government use

switched over to sell these devices to private entities. Since then, there

has been a slow but steady increase in their purchase and use, especially

in major metropolitan areas.

A rundown of the history of mobile phones is as below:

Mobile Telephone Service (1946- 1984): This system was

introduced on 17th of June, 1946. Also known as Mobile Radio

Telephone Service. This was the founding father of the mobile

phone. This system required operator assistance in order to

complete a call. These units do not have direct dial capabilities.

Improved Mobile Telephone System (1964-present): This

system was introduced in 1969 to replace MTS. IMTS is best

known for direct dial capabilities. A user was not required to

connect to an operator to complete a call. IMTS units will have a

keypad or dial similar to what you will find on a home phone.

Multi Jammer


Advanced Mobile Phone System (1983-2010): This system was

introduced in 1983 by Bell Systems; the phone was introduced by

Motorola in 1973 and released for public use in 1983 with the

Motorola 8000. Advanced Mobile Phone System (AMPS) also

known as 1G is an improvement of IMTS.

2.5 Present Work

The previous research that related to Mobile Phone Jammer is widely

used in United Kingdom. There is no company in Nigeria that provides

these mobile phone jammers. This project if implemented in the

mosque/church will help avoid any disruptive while in the mosques.

People who are bringing their mobile phones inside the mosque will have

the phone signal jammed, thus, detecting no signal. This Mobile Phone

Jammer is using GSM to jam the frequencies.

Global System for Mobile Communications (GSM) GSM is an acronym

for Global System for Mobile communications. It accounts for about 70%

of the global mobile market. GSM uses a variation of time division

multiple access (TDMA) and is the most widely used of the three digital

wireless telephone technologies (TDMA, GSM, and CDMA).

2.6 How a GSM Jammer works

Cell phones communicate with a service network through cell towers.

Cell towers are placed in specific places to provide service to small areas.

As a cell phone is moved between these areas, the towers pass the signals.

A GSM jammer transmits on the same airwaves that cell phones do.

When the jammer is activated, it is able to disrupt the signal between the

cell phone and the nearest tower. Because the GSM jammer and the cell

phone use the same frequency, they effectively cancel the other signal.

2.7 How GSM Jammers are made

GSM jammers are usually simple devices with typically only a switch to

turn it on and off, a light to show that it is working and an external

antenna to send the signal. If the jammer is more sophisticated, it might

include controls to set the jamming for varied frequencies or strengths.

Small GSM jammers are usually powered by batteries. Often, the

Multi Jammer


batteries are even the same as cell phone batteries. Larger GSM jammers

are electrically powered.

2.8 GSM Jammer Range

GSM jammers typically have a range of between 50 and 80 feet. This

means that they will only successfully jam cell phones that are within this

range. As soon as the cell phone travels out of range, the signal will

return and you can again use the phone. More sophisticated cell phone

jammers might have larger ranges, typically associated with higher power

(wattage) jammers.

2.9 Radio Frequency Jammer Uses

Some buildings, businesses, offices and churches are now beginning to

utilize strong Radio Frequency jammer equipment that are mounted on a

wall or a ceiling. These Radio Frequency jammers are generally housed

in small metal boxes and are quite inconspicuous. Radio Frequency

jammers like this can effectively make cell phone use impossible within

the building.

This is also of high importance in the provision of adequate security, by

disrupting network signals required to detonate bombs and other

explosives.

2.10 Radio Frequency Jammer Evolution

When cell phone Radio Frequency jammers first hit the market,

consumers didn’t have many options to choose from. The available units

were typically brief cased sized or larger, and could be difficult to carry

around. Today, however, you will find many more cell phone Radio

Frequency jammer options available, including some units that are small

enough to fit within the palm of your hand.

One of the great aspects of having a small cell phone Radio frequency

jammer is the fact that you can carry one with you wherever you go.

The questions below will justify the use of Radio Frequency jammers:

• Have you ever been caught in line at a fast food restaurant behind

someone that won’t turn off his cell phone and place his order?

Multi Jammer


• Have you ever been caught in your morning bus commute, being forced

to listen to every detail of last night’s escapades from one of the other

commuters?

• Have you ever gone to see a film, only to be distracted by the narration

into the cell phone by one of the other patrons?

Evidently, one will appreciate the thought of having a small cell phone

Radio Frequency jammer that you can activate whenever you like.

When you use your personal Radio Frequency jammer, you will enjoy…

• Instant peace and quiet.

• Faster processing in lines when you are behind a cell phone user.

• The film with its original dialogue.

• Perfect rest of mind and a reduction in risk of being exposed to bombs

and other Radio Frequency controlled explosives.

Although the range of a portable or pocket sized cellular phone Radio

Frequency jammer is not as broad as larger fixed models, they are large

enough to help you bring peace and quiet to your personal space.

2.11 Summary

This chapter is about the previous and present work on this project. This

chapter dwells on the difference in technology being used in the evolution

of this device. This chapter has been written as a result of research using

articles, books, magazines,websites and other methods.

Multi Jammer


CHAPTER 3

METHODOLOGY

3.1 Introduction

This chapter explains in detail the methodology and components of this

final year project report. Each part and component that has been selected

has as its own purpose mostly focused on functionality and low cost. In

this chapter also, the technical plan, analysis and also the specifications

are being explained.

3.2 Definition of Methodology

Methodology is defined as:

i. "The analysis of the principles of methods, rules, and postulates

employed by a discipline".

ii. "The systematic study of methods that are, can be, or have been

applied within a discipline".

iii. "a particular procedure or set of procedures" .

3.3 Project Overview

This section will briefly explain about the complete device, components

used, block diagram and flow chart, design and equipments being used.

This device will operate only using the hardware.

3.4 Frequency Band

It is very important to choose the frequency to block. Basically, the

mobile jammer will transmit at the same frequency as the mobile signal

frequency at the base station. This device was design to block the

downlink transmission because the frequency required to be blocked is a

Multi Jammer


Very High Frequency (VHF). In this case, the device uses GSM900 to

block in which the frequency is in range 935 to 960 MHz.

3.5 :System Block Diagram

Figure 3.1: System Block Diagram

Figure 3.1 shows the systems block diagram where the power supply

energizes the local oscillator for GSM and Radio receiver. The frequency

generated by the local oscillator (s) then mix with the frequency at the IF

section and this produces two RF, one for GSM and one for radio

receiver, and thus jams the GSM/ radio receiver signal to produce noise.

The system flow chart shows that when the power is ON, the supply will

go into triangular wave generator and noise generator. The two signals

will be mixed in the mixer so that the signal will be a noise. Then the

signal will be transferred to the clamper for achieving the desired voltage

to VCO. Then the signal will then go through the VCO at the RF section

after being amplified, and will then interfere with the mobile signal. This

system flow chart can be seen as being applied to both GSM and radio

frequency receiver, with considerable difference in operating frequency.

Multi Jammer


3.5.1 Power Supply

From figure 3.2, it shows that the device needs supply to operate the

system. Figure 3.3 shows the circuit diagram and shows the PCB design

for the power supply circuit. The operation of power supply is as shown:

Figure 3.2: Power Supply Circuit Diagram

Figure 3.3: Transformer 9 Volts

Multi Jammer


Figure 3.3 shows the transformer which transforms 220V AC to other

levels of voltage. Its functions are outlined below:

i. Rectification: Convert the AC voltage to DC voltage.

ii. Filtering: “Eliminate the noise” so that a constant DC voltage is

produced. This filter is just a large capacitor used to minimize the ripple

in the output.

iii. Voltage Regulation: It provides the desired DC voltage.

3.5.2 Intermediate Frequency Section (IF)

Intermediate Frequency section is the section where the signal is produce

to the Radio Frequency section (RF). IF section is the frequency tuning

section which processes the triangular wave mixed with noise signal to

sweep the Voltage Controlled Oscillator (VCO). The IF section consists

of four main parts which are:

a) Triangular Wave Generator: To tune the VCO in the RF section.

b) Noise Generator: To generate output noise.

c) Mixer: To mix the triangular signal with the noise signal.

d) Clamper: To reduce the desired voltage for VCO.

3.5.3 Triangular Wave Generator

Figure 3.4: Triangular Wave Generator Circuit Diagram

Multi Jammer


Triangular wave generator is used to sweep the tuning frequency to the

Voltage Controlled Oscillator (VCO). It will sweep the desired frequency

range to cover the downlink frequency which is 935 to 960 MHz where

this is the frequency range that needed to block the transmission for

GSM. 555 timer IC was used and operates in a stable mode to generate

the sweeping signal to the VCO. The output frequency for triangular

wave generator is 110 kHz.

3.5.4 Noise Generator

Figure 3.5 is the circuit diagram of the Noise Generator. Without noise,

the output of the VCO is just an un-modulated sweeping RF carrier. Due

to this, it is required to mix the triangular signal and noise (Frequency

Modulated (FM) modulating the RF carrier with noise). To generate the

noise signal, zener diode be used in reverse mode. This is because;

operating in the reverse mode will cause avalanche effect. Avalanche

effect in this stage means it will create a wide band noise. Then the noise

will be amplified. There are two stages where the noise will be amplified

which is NOISE GENERATR .

Figure 3.5: Noise generator

Multi Jammer


3.5.5 Clamper

Figure 3.6: Clamper Circuit Diagram

Clamper is a circuit where capacitor is connected in series with resistor

and diode. The circuit is been shown in Figure 3.6. The input of VCO

must be bounded from 0 to 3.5 V. This is the reason why clamper being

used. The clamper being used to achieve the desire voltage been needed

for VCO.

3.5.6 Radio Frequency Section (RF)

Radio Frequency section is the most important part in this device where

the output of this section will interface with the transmission of mobile

signal. This section contains three parts which is: Voltage Controlled

Oscillator, Power Amplifier and Antenna.

Multi Jammer


3.5.7 Voltage Controlled Oscillator (VCO) :

Figure:3.7 Voltage Controlled Oscillator

The most important part in this section is Voltage Controlled Oscillator.

The reason it is important because Voltage Controlled Oscillator will

generate the RF signal which will block the mobile signal transmission.

The output of the Voltage Controlled Oscillator has a frequency which is

proportionally with the input voltage. In this case, we can change the

output frequency by changing the input voltage. There are three criteria to

select a Voltage Controlled Oscillator:

a) Cover the bands that needed.

b) Low cost.

c) Run at low power consumption.

After some period of researching of the component, finally I found out

that CVCO55CL is the suitable component for blocking the frequency

range 935 to 960 MHz. Figure 3.7 shows the Voltage Controlled

Multi Jammer


Oscillator image. The output power is up to 8dBm. The reason this

component been selected because of these reasons:

a) Surface mount can reduce the size of product.

b) Large output power which can reduce the amplification stages.

c) Having the same value of power supply which is 5V.

d) Having same noise properties.

3.5.8 Power Amplifier

The power amplifier been used in this device is ADL5570. This power

amplifier specification is suitable to be used in telecommunications

devices. Therefore the specifications for the device are as follows:

a) Fixed gain of 29dBm.

b) Operate from 2.3GHz to 2.4GHz.

c) Power out 25dBm.

3.5.9 Antenna

Antenna is a device which transmits a signal around it. So, in this case the

antenna must be selected due to the project’s objectives. The criterion is

as follows:

a) Monopole antenna.

b) Input impedance 50Ω.

c) VSWR < 2 (Voltage Standing Wave Ratio).

d) Frequency 850 MHz to 1 GHz.

e) Range covered in 1meters.

This criterion is being chosen because the antenna must transmit the same

frequency as the mobile signal frequency. When the ratio between the

antenna frequency and the mobile signal frequency is 1:1, the mobile

signal frequency will be blocked.

Multi Jammer


3.6 Summary

This chapter explains the methods and the functionality of all the

components that are used in the construction of this project. Development

of Radio Frequency Jammer has three main parts which is Power Supply,

Intermediate Frequency section and Radio Frequency section. The device

operates when the power supply gives ± 12V to IF and RF section. The

triangular wave regulator will regulate the triangular waveform as an

input to RF section. The triangular wave and the noise signal will be

mixed in the mixer for the RF so that it will transmit the desired noise

frequency. The mixture of the signal then will be transferred to clamper

so that the clamper will give the desired voltage range between 0 to 3.5V

for Voltage Controlled Oscillator. Then the signal will be amplified at

power amplifier at RF section and then transmitted as a high noise

frequency range 935 to 960 MHz. This criterion is been chosen because

the antenna must transmit at the same frequency as the mobile signal

frequency. When the ratio between the antenna frequency and the mobile

signal frequency is 1:1, the mobile signal frequency will be blocked.

Multi Jammer


CHAPTER 4

PRESENTATION AND ANALYSIS OF RESULT

4.1 Introduction

This chapter explains the results of the project and the analysis

throughout this project. It gives a detailed insight on the analysis and

output of the project.

4.2 Result Presentation

The Radio Frequency jammer has been tested against three mobile phone

networks and against radio frequency receivers.

The circuit has been constructed on a Vero board. The jammer has been

designed into three sections which are; power supply, IF section and RF

section. The reason why the jammer was designed into three parts is

because it gets easy when doing troubleshooting.

Since 5dBm output powers from the VCO do not achieve the desired

output power of the GSM jammer, an amplifier with a suitable gain must

be added to increase the VCO output to 34dBm. The PF08109B has high

gain of 35 dB. As datasheets illustrated that this IC is designed to work

on dual band GSM & DCS, the first design of the circuit is using only one

power amplifier IC. Upon testing, the jammer didn’t work properly. It

was concluded that amplifier IC does not work at the two bands

simultaneously. Such a fact was not indicated in the datasheets. This

result was really a big shock, but easily solved by changing the whole RF

design.

4.3 Analysis

Mobile Detector for Smart Mobile Phone jammer was successfully used

to jam three mobile operators. Which are MTN, ETISALAT and

GLOBACOM. When the jammer is ON it will jam the mobile phones in

Multi Jammer


that range that are using 2G GSM networks. This jammer did not function

in 3G mobile phone because 3G use high frequency which is 2100MHz

frequency while 2G only cover 815MHz to 925MHz. [4] The results

show that this project functioned as intended. This testing is to see the

duration of time taken by the jammer to jam the GSM phone between the

operators. The testing has been done using three major mobile operators

in Nigeria which are MTN, ETISALAT and GLOBACOM. Based on the

result and testing of the Mobile Jammer, the objective of this project has

been achieved. The Mobile Detector Phone Jammer successfully jammed

all the three operators but the radius of the range did not get as expected

in the designed. Results been obtained when the Development of Radio

Frequency/GSM Signal Jammer was “ON”, the mobile phone

transmission signal will show “NO NETWORK” .

4.4 System Testing and Integration

4.4.1 System

Testing After the construction and implementation phase, the system built

has to be tested for Durability, Efficiency, and Effectiveness and also

ascertain if there is need to modify this construction. The system was first

assembled using a breadboard. All components were properly inserted

into the breadboard from whence some tests were carried out at various

stages. To ensure proper functioning of components’ expected data, the

components were tested using a digital multi meter (DMM). Resistors

were tested to ensure that they were within the tolerance value. Faulty

resistors were discarded .The 78LS05 voltage regulator was also tested,

the resulting output was 5.02v which is just a deviation of 0.02v from the

expected result of 5.00v.The LEDs were tested to ensure that they were

all working properly.

4.4.2 Test

Plan and Test Data This chapter entails an overall system testing of the

integrated design of the voltage measurement device. The testing and

integration is done to ensure that the design is functioning properly as

expected thereby enabling one or even intended users for which the

project was targeted for, appreciate its implementation and the

approaches used in the construction and integration of the various

Multi Jammer


modules of the project. However, this involves checks made to ensure

that all the various units and subsystems function adequately. Also there

has to be a good interface existing between the input/output unit

subsystems. When the totality of the modules was integrated together, the

system was created and all modules and sections responded to as

specified in the design through the power supply delivering into the

system designed. The circuit has been constructed on a Vero board. The

jammer has been designed into three sections which are; power supply, IF

section and RF section. The reason why the jammer was designed into

three parts is because it gets easy when doing troubleshooting.

4.4.3 Component Test

Similar components like resistors were packed together. Other

components includes capacitor, preset switches, transformer, diodes

(rectifier) LED, transistor, voltage regulator etc Reference was made to

resistor colour code data sheet to ascertain the expected values of

resistors used. Each resistor was tested and the value read and recorded.

The collector, base and emitter junctions were tested in the following

order. The collector, emitter and base pins were gotten from the data

analysis on power transistor.

4.4.4 System final Testing

After construction of the device, it was taken to the electronics laboratory

for testing, this was necessary because the device had to be tested with a

varying input supply voltage, this was to enable us to determine the

system’s ability to provide protection to the equipment connected to it.

The system was powered and operated upon using several possibilities.

They include plugging and unplugging the mains and noting the output

responses of the system hardware. The system delays and allows output

alongside the corresponding LED in the seven segments. The actual

testing is not just to block the transmission signal but to check the

duration of the time taken by the device to block the transmission

between these three operators MTN, ETISALAT and GLOBACOM.

From the testing, the time taken for the device to block the transmission

between these three operators was totally different.

Multi Jammer


4.5 Summary

Based on the result and analysis, the device can successfully block the

signal transmission of mobile phone and radio transmission. The device

can block three main operators in Nigeria which are MTN, ETISALAT

and GLOBACOM. Cell phones are everywhere these days. According to

the Cellular Telecommunications and Internet Association, almost 195

million people in the United States had cell-phone service in October

2005. And cell phones are even more ubiquitous in Europe. The duration

time has also been tested on this device. Although the device can operate

as expected, but the radius of the antenna did not meet the expectation.

The radius should be more than obtained result which is one meter.

Multi Jammer


CHAPTER 5

SUMMARY OF ACHIEVEMENT, PROJECT

LIMITATION, RECOMMENDATION AND

CONCLUSION

5.1 Summary

Achievement With a little more stress of soldering the components

together, I was able to assemble the components according the paper

design. At the end, I was able to produce a functional circuit that is well

fit in its place. I was able to make it work using my own specifications. It

was not so easy getting to identify the entire components after I took

them to my hostel, all mixed up in a container. Sorting them was a great

problem. This problem I had is common to majority of engineering

student. This is due to the fact that we do not engage in practical more

often. I thereby suggest that a good mix of academic activity will be made

up of theory and practice. This should be drafted by those that design the

school curriculum to assist the student in the technical aspect of their

academics.

5.2 Project Limitation

1) Wireless signal jammer is an illegal device to be used in Nigeria as the

frequency that is been used by the operators are legally given by the

National Communication Commission (NCC).

2) The components are hard to find and expensive.

3) The radius covered by the device is too small.

4) The frequency and the power used are only for GSM and Radio

transmission.

Multi Jammer


5.3 Recommendation

It is recommended that engineers should try and improve this work so

that it can perfectly block the network without having to bring the phone

too close to the jammer. There are a few improvements that should be

done for making the device more stable. First, the main subject is the

frequency range; the device cannot only block GSM (2G) transmission

but can also block 3G transmission. The frequency range can be

improved by using a high frequency VCO and power amplifier. For the

radius, it can be wider. So to improve this, a more stable power supply

should be designed for robust operation of the device. The antenna also

must be a bit bigger for the sake of power transfer. The power supply

could be improved, where a step-down would not be used, thereby

reducing the entire size of the project. Similarly, micro soldering could

also be used in order to further reduce the size of the equipment.

5.4 Conclusion

Development of Radio Frequency/GSM Signal Jammer for Security

Application successfully achieves the entire objectives targeted.

Development of Radio Frequency/GSM Signal Jammer for Security

Application has been designed to stop mobile phone communication

(GSM), Amplitude Modulated (AM) and Frequency Modulated (FM)

signals within its range. This device is mainly being designed for the use

of public. The means of this is to locate this device at mosque, schools,

convention hall, meeting rooms, library, and crowded places where the

risks of bombs being targeted are high. These places always need a silent

and peaceful environment. The device has been designed to work in

GSM900 band. The frequency for GSM900 is 935 to 960 MHz which is

GSM or 2G mobile phone transmission.

The device has been able to block the transmission for three main

operators in Nigeria which is MTN, ETISALAT and GLOBACOM. The

radius that covered by the device is too small due to power supply

variation with load current. Radio Frequency/GSM Jammer can be used

to ensure maximum Security and is highly beneficial in a country like

Nigeria where in recent times terrorism has become the order of the day

and thus, providing an interruption to signals required to detonate bombs

and other explosives which require to be detonated from a distance.

Multi Jammer


CHAPTER 6

CELL PHONE JAMMER

6.1. HISTORY

The rapid proliferation of cell phones at the beginning of 21st century to

near ubiquitous status eventually raised problems such as their potential

use of invade privacy or contribute to rampant and egregious academic

cheating. In addition public black lash privacy or contribute to rampant

The rapid proliferation of cell phones at the beginning of the 21st

century to near ubiquitous status eventually raised problems such as

their potential use to invade privacy or contribute to rampant and

egregious academic cheating. In addition public backlash was growing

against the intrusive disruption cell phones introduced in daily life. While

older analog cell phones often suffered from chronically poor reception

and could even be disconnected by simple interference such as high

frequency noise, increasingly sophisticated digital phones have led to

more elaborate counters. Cell phone jamming devices are an alternative

to more expensive measures against cell phones, such as Faraday cages,

which are mostly suitable as built in protection for structures. They were

originally developed for law enforcement and the military to interrupt

communications by criminals and terrorists. Some were also designed to

foil the use of certain remotely detonated explosives. The civilian

applications were apparent, so over time many companies originally

contracted to design jammers for government use switched over to sell

these devices to private entities. Since then, there has been a slow but

steady increase in their purchase and use, especially in major

metropolitan areas.

6.2. Introduction to cell phone jammer

Cell phones are everywhere these days. According to the Cellular

Telecommunications and Internet Association, almost 195 million people

Multi Jammer


in the United States had cell-phone service in October 2005. And cell

phones are even more ubiquitous in Europe.

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.

6.3.Cell Phone Jamming Basics

Disrupting a cell phone is the same as jamming any other type of radio

communication. A cell phone works by communicating with the service

network through a cell toweras 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.

Jammer disrupting the communication between the phone and the cell

phone base station in the tower. It’s called denial-of-service attack. The

jammer denies service of the radio spectrumThe rapid proliferation of cell

phones at the beginning of the 21st century to near ubiquitous status

eventually raised problems such as their potential use to invade privacy or

contribute to rampant and egregious academic cheating. In addition

public backlash was growing against the intrusive disruption cell phones

introduced in daily life. within range of the jamming device as While

older analog cell phones often suffered from chronically poor reception

and could even be disconnected by simple interference such as high

frequency noise, increasingly sophisticated digital phones have led to

more elaborate counters to the cell phone users within range of the

jamming device as cell phone users within range of the jamming device .

Multi Jammer


Figure:6.1. Cell phone jammer circuit

6.4. Cell Phone Jamming Device

Jamming devices overpower the cell phone by transmitting a signal on

the same frequency and at a high enough power that the two signals

collide and cancel each other out.

Cell phones are designed to add power if they experience low-level

interference, so the jammer must recognize and match the power increase

from the phone.

Cell phones are full-duplex devices, which means they use two

separate frequencies, one for talking and one for listening simultaneously.

Some jammers block only one of the frequencies used by cell phones,

which has the effect of blocking both. The phone is tricked into thinking

there is no service because it can receive only one of the frequencies.

Multi Jammer


Less complex devices block only one group of frequencies, while

sophisticated jammers can block several types of networks at once to

head off dual-mode or tri-mode phones that automatically switch among

different network types to find an open signal. Some of the high-end

devices block all frequencies at once, and others can be tuned to specific

frequencies.

To jam a cell phone, all you need is a device that broadcasts on the

correct frequencies. Although different cellular systems process signals

differently, all cell-phone networks use radio signals that can be

interrupted. GSM, used in digital cellular and PCS-based systems,

operates in the 900-MHz and 1800-MHz bands in Europe and Asia and in

the 1900-MHz (sometimes referred to as 1.9-GHz) band in the United

States. Jammers can broadcast on any frequency and are effective against

AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems.

Oldfashioned analog cell phones and today's digital devices are equally

susceptible to jamming.

The actual range of the jammer depends on its power and the local

environment, which may include hills or walls of a building that block the

jamming signal. Low-powered jammers block calls in a range of about 30

feet (9 m). Higher-powered units create a cell-free zone as large as a

football field. Units used by law enforcement can shut down service up to

1 mile (1.6 km) from the device. Cell phones are everywhere these days.

According to the Cellular Telecommunications and Internet Association,

almost 195 million people in the United States had cell-phone service in

October 2005. And cell phones are even more ubiquitous in Europe.

6.5. Design Parameters

Based on the above, our device which is related to the DOS technique is

transmitting noise on the same frequencies of the two bands GSM 900

MHz, and GSM 1.8 GHz (known also as DCS 1800 band). We focused

on some design parameters to establish the device specifications. These

parameters are as follows: The distance to be jammed (D) This parameter

is very important in our design, since the amount of the output power of

the jammer depends on the area that we need to jam. Later on we will see

the relationship between the output power and the distance D. Our design

Multi Jammer


is established upon D=10 meters for DCS 1800 band and D=20 meters

for GSM 900 band.

6.6 Jamming – to - signal ratio J/S

Jamming is successful when the jamming signal denies the usability of

the communication 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 (mobile

device). The general equation of the jamming-to-signal ratio is given as

follows: where: Pj = jammer power, Gjr = antenna gain from jammer to

receiver, Grj=antenna gain from receiver to jammer, Rtr=range between

communication transmitter and receiver, Br=communication receiver

bandwidth, Lr =communication signal loss, Pt=transmitter power, Gtr=

antenna gain from transmitter to receiver, Grt=antenna gain from receiver

to transmitter, Rjr=range between jammer and communication receiver,

Bj=jammer bandwidth, and Lj=jamming signal loss. For GSM, the

specified system SNRmin is 9 dB which will be used as the worst case

scenario for the jammer. The maximum power at the mobile device Pr is -

15 dBm.

6.7 Free space loss F

The free-space loss (or path loss) is given by: The maximum free space

loss (worst case F) happens when the maximum frequency is used in the

above equation. Using 1880 MHz gives: F (dB) =32.44+20 log 0.01 + 20

log 1880 which gives F =58 dB.

6.8 Component of Cell Phone Jammers

Electronically speaking, cell-phone jammers are very basic devices. Cell

phones are full-duplex devices, which means they use two separate

frequencies, one for talking and one for listening simultaneously The

simplest just have an on/off switch and a light that indicates it's on. More

complex devices have switches to activate jamming at different

frequencies. Components of a jammer include:

Multi Jammer


6.8.1 Power supply

Smaller jamming devices are battery operated. Some look like cell phone

and use cell-phone batteries. Stronger devices can be plugged into a

standard outlet or wired into a vehicle's electrical system.

6.8.2 Circuitry

The main electronic components of a jammer are:

Voltage-controlled oscillator : Generates the radio signal that

will interfere with the cell phone signal

Tuning circuit : Controls the frequency at which the jammer

broadcasts its signal by sending a particular voltage to the

oscillator Noise generator - Produces random electronic output in a

specified frequency range to jam the cell-phone network signal

(part of the tuning circuit) RF amplification (gain stage) - Boosts

the power of the radio frequency output to high enough levels to

jam a signal.

6.8.3 Antenna

Every jamming device has an antenna to send the signal. Some are

contained rical cabinet. On stronger devices, antennas are external to

provide longer range and may be tuned for individual frequencies.

How Cell Phone Jammers Work ?

Cell phone jammers work in a similar way to radio jammers by sending

out the same radio frequencies that cell phones operate on. Doing so

creates enough interference so that a call cannot connect with a cell

phone. There are two types of cell phone jammers currently available.

The first type are usually smaller devices that block the signals coming

from cell phone towers to individual cell phones. The frequency blocked

is somewhere between 800MHz and 1900MHz. Most devices that use

this type of technology can block signals within about a 30-foot radius.

Cell phones within this range simply show no signal.

The second type of cell phone jammer is usually much larger in size

and more powerful. They operate by blocking the transmission of a signal

Multi Jammer


from the satellite to the cell phone tower. Some powerful models can

block cell phone transmissions within a 5 mile radius. It should be noted

that these cell phone jammers were conceived for military use.

Once again, it should be noted that operating or even owning a cell phone

jammer is illegal in most municipalities and specifically so in the United

States. Many businesses such as theaters and restaurants are trying to

change the laws in order to give their patrons better experience instead of

being consistently interrupted by cell phone ring tones.

6.9 Jamming techniques

Type “A” Device (JAMMERS): 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.

Type “B” Device (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.

Type “C” Device (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 compatible terminal is

instructed to disable its ringer or disable its operation, while within

the coverage area of beacon.

Type “D” Device (Direct Receive & Transmit Jammers): This

jammer behaves like a small, independent and portable base

station, which can directly interact intelligently 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.

Multi Jammer


Type E Device (EMI Shield - Passive Jamming): This technique

is using EMI suppression techniques to make a room into what is

called Faraday cage. Cell phones are full-duplex devices,

which means they use two separate frequencies, one for talking and

one for listening simultaneously 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.

6.10. Types of cell phone jammer Device :

There are many types of cell phone jammer device which is used in our

daily life .as we take a example of class room ,where we does not want to

use of cell phone than there we can use cell phone jammer device by this

we can produce the interface between the cell phone station and jamming

device. Resulting it disconnect the cell from base station and we cannot

receive the any calls from base station. For this there are many types of

cell phone jammer devices which is given as below:

Portable cell phone jammer

Remote control cell phone jammer

Adjustable cell phone jammer

School &prison phone jammer

Explosion-proof cell phone jammer

Police &military phone jammer One of the cell phone jammer

device is “single knight brand ultra-thin cell phone jammer” .

An Overview to Cell Phone Jammer

A cell phone jammer is a device that emits signal in the same

frequency range that cell phones use, effectively blocking their

transmission by creating strong interferences. The power of the

Jammer’s effect can vary widely based on a factors such as

proximity to towers, indoor and outdoor settings, presence of

Multi Jammer


building and landscape, even temperature and humidity play a

role.

Jammer blocks cell phone use by sending radio waves along the

same frequencies that cellular phones use. This causes enough

interference with the communication of cell phones and the towers

to render the phones unusage. Thus jammer can work by either

disrupting phone to tower frequencies or tower to phone

frequencies.

Multi Jammer


CHAPTER 7

MODERN COMMUNICATION TECHNIQUES

7.1 Global System for Mobile Communication :

GSM is the most popular standard for mobile phones in the world. GSM

is an open standard which is currently developed by the 3GPP. GSM

networks operate at various frequencies most of them operate at 900MHz

or 1800MHz.There are four different cell sizes in a GSM network –

Macro, Micro, Pico and umbrella cells. The coverage area of each cell is

different in different environments. Cell radius varies depending on

antenna height, gain and propagation conditions from couple of 100Mtrs

to several tens of kilometers. The longest the GSM specifications

supports in practical use in 35 kilometers.

7.1.1 GSM Frequency Bands

There are five frequency bands used by GSM mobile phones.

GSM – 900

GSM – 1800

GSM – 850

GSM – 1900

GSM – 422

7.1.2 Subscribers Identity Module

One of the key features of GSM is the Subscriber Identity Module (SIM),

commonly known as SIM card. The SIM is a detachable smart card

containing the user’s subscriptions information and phone book.

The SIM card holds all of a subscriber’s personal information and

phone settings.

Multi Jammer


It also holds phone number, personal security key and other data

necessary for the handset to function.

The card can be switched from phone to phone, letting the new

phone receive all calls to the subscriber’s numbers.

7.2 Code Division Multiple Access

CDMA, a proprietary standard designed by Qualcomm in the United

States, has been the dominant network standard for North America and

parts of Asia. CDMA has been traditionally faster than GSM. CDMA lets

every one transmit at the same time. It works by assigning unique codes

to all speech bits and the encrypted signal are dispersed over a wide

frequencies spectrum of 1.25MHz. The signals are picked out by the

receiver’s equipment that is tuned / programmed to identify that code. In

contrast to GSM, same frequency channels are used in each cell.

CDMA splits the sound in to small bits that travels on a spread

spectrum of frequencies. CDMA technology allows a network to handle

more calls than competing digital technologies.

Advantage of CDMA

Voice quality

Call security

Network Capacity

Call Maintenance

CDMA digital technology offers clean, clear connection and

superb voice quality.

CDMA spread spectrum technology helps eliminate frustrating

bottle necks.

CDMA digital technology keeps the user connected by using a soft

hand off.

Multi Jammer


CHAPTER 8

BLOCK DIAGRAM AND ITS WORKING

8.1. INTRODUCTION

The Cell Phone Jammers works on the same frequency band of the cell

phones operate ‘Cell phone has a property of frequency shifting. When

there is any disturbance on operating frequency will shift into the next

channel. This continues operation keeps the cell phone link free from any

interference and co-channel interference. The GSM band frequency is

925MHz-960MHz. The CDMA band frequency is 825MHz-860MHz.

In Cellular Communication system there are 124 channels available

for any cell user. In this process the cell has to search for free channels.

During this process the cell phone takes 40 µsec for searching between

adjacent cells. The bandwidth between each channel is 200 kHz.

FIGURE 8.1. BLOCK DIGRAM OF CELL PHONE JAMMER

PULSE

GENERATOR

MIXER MODULATOR BPF PREAMPLIFIER

PINK NOISE

GENERATOR

HYBRID

OSCILLATOR OUTPUT MOS

AMP

WHIP ANTENNA

Multi Jammer


8.2. HYBRID OSCILLATOR

In order to block the cell phones, we have to generate Jamming

frequencies with 40 µsec scanning speed. The blocking range is 835 MHz

to 980 MHz. But to the presence of variations in temperature, fluctuations

in circuitry, we generate 800 MHz to 1000 MHz. Initially a spot

frequency is generated in the range between 800 MHz to 1000 MHz. In

order to spread the frequencies in the full range, scanning voltage is

applied. The scanning voltage is varied and depending on the variations

frequencies in the range 800 MHz to 1000 MHz is generated.

8.3. PULSE GENERATOR

The Pulse Generator is used to generate the pulses. These pulses are used

to convert the analog signals into digital signals, since we use digital

modulation in the cellular system. This can be done by a pulse generator

which produces pulses of 1 µsec. The pulse generator uses TL084 CN

QUAD op-amp consist of four op-amps.

8.4. PINK NOISE GENERATOR

Another input to the modulator is “Pink Noise”. The pink noise is

generated by using pink noise generator. This noise is used as a message

signal so that modulation stage results in producing noise in the cell

phone frequency range and to create confusion in the hand set.

Noise generator – Produces random electronic output in a specified

frequency range to jam the cell – phone network signal (part of the

tuning circuit)

The noise generator is just a standard 6.8 volt Zener diode with a small

reverse current and a transistor buffer. The (optional) National LM386-1

audio amplifier acts as a natural band-pass filter and small-signal

amplifier. The noise jamming signal is then mixed with the triangle wave

input. This will help in making the jamming transmission, making it look

random “noise” to and outside observer. Without the noise generator, the

jamming signal is just a sweeping, unmodulated Continuous Wave (CW)

RF carrier.

Multi Jammer


The LM386 based noise generator may break in to oscillation or

Output very low signal. If does this, adjust the Zener bias resistor (2 k) up

Down few hundred ohms while observing the signal (disconnected from

the LM386) on an oscilloscope for the maximum noise signal. The

grounding should be done properly. The LM386 will oscillate without a

good grounding system and poor power supply bypassing.

Any Zener diode above or equal to 6.2 volts will work in the noise

generator, as this Zener diode have an “avalanche” region which

generates a tremendous amount of noise when properly biased.

8.5. Modulator

The modulation of used is GSMK. GSMK means Gaussian Minimum

shift keying, which is a continuous phase, frequency shifting keying

process. That means only the phase is kept constant varying frequency of

the carrier in accordance with the message signal which is pink noise

here. For the modulation purpose an oscillator circuit with the variable

capacitance diode is used here.

The frequency ranges used in the cell phone band are in MHz ranges

so ordinary transistors are not enough for the modulation. So here high

frequency transistors are used. The high frequency transistors used here is

BFG 65. These transistors can be used for the MHz ranges.

8.6. Band pass Filter

Due to the modulation process some variations occurs which disturb other

applications. So to avoid this and for gaining accuracy this complex

signal waveform is passed through a 50 Ώ a strip line filter. This special

filter prevents GSM/CDMA pulsed signal from overshooting from

specified band spectrum. Here the lower band and upper band are also

limited by stripline filter.

8.7. Preamplifier

The output power obtained is very low. This is not enough to drive the

output MOSFET amplification section. In order to drive the MOSFET

power module the preamplifier stage is used which produces an output of

2.5mV. The bandwidth corrected signal is connected to 2 dB attenuator

Multi Jammer


before power module. The 2 dB attenuator is used to give correct

impendence matching to the MOSFET power module.Cell phones are

full-duplex devices, which means they use two separate frequencies, one

for talking and one for listening simultaneously This is necessary because

the output amplifier is build with MOSFET module which requires very

low signal level to drive with effective impendence matching. The output

module is mounted as far as from all other signal sources and power

supply section to avoid stray RF noise coupling.

8.8. Output MOSFET Amplifier

The output module works from 3.6 V DC at 3 – 5 current. This output

module is more critical to assemble as even a low stray coupling may

lead to strong oscillation and cause to overload the module, finally

damage.

The power supply line is adequately decoupled with good quality

low leakage capacitors and RF inductors. The heat produced by the

module also should be radiated properly to keep the surface temperature

within limit. Normally a good quality heavy duty heat sink with direct

mounted module is critically coupled through strip line and inductive.

The MOSFET power module used in the output stage has lot of

advantages

It doesn’t require heavy supply voltage.

The input impedance is low.

Gives full output with low input signal level.

Output power can be adjusted with small control DC voltage.

The output impedance is high.

Very small in size.

Low distortion at high level output.

This advantage makes the MOSFET power module as an ideal output

device for this project.

8.9. WHIP ANTENNA

Every jamming device has an antenna to send the signal. Some are

contained within an electrical cabinet. On stronger devices, antennas are

external to provide longer range and may be tuned for individual

frequencies.

Multi Jammer


The output of the module is terminated to a whip antenna with

correctly tuned matching network. This network helps to transfer the

generated energy to the area without much loss. Cell phones are

everywhere these days. According to the Cellular Telecommunications

and Internet Association, almost 195 million people in the United States

had cell-phone service in October 2005. And cell phones are even more

ubiquitous in Europe. Correct impedance matching is necessary to keep

the standing wave ratio as low as possible. Otherwise the return loss will

hit up the output module causing permanent damage. A copper wire is

used as whip antennas with 1/4th wave length. This antenna has a

radiation pattern of 360°.

The most important part of a radio system is the antenna. Directional

gain antennas can be used to increase the jammer’s performance, but only

in the direction the antenna is pointed. High-gain, omni-directional

antennas are the best.To cover an area bigger than 2800 square meters.

Multi Jammer


CHAPTER 9

Cell Phone Jammer Applications

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 London in November 2004, it was reported that

British police considered using jammers 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 transmissions 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.

9.1. Cell Phone Jamming Legal Issues

In the United States, United Kingdom, Australia and many other

countries, blocking cellphone services (as well as any other electronic

Multi Jammer


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.

Federal Communications Commission is charged with enforcing

jamming laws. However, the agency has not yet prosecuted anyone for

cell-phone jamming. Under the U.S. rules, fines for a first offense can

range as high as $11,000 for each violation or imprisonment for up to one

year, and the device used may also be seized and forfeited to the

government.

In most countries, it is illegal for private citizens to jam cell-phone

transmission, but some countries are allowing businesses and government

organizations to install jammers in areas where cell-phone use is seen as a

public nuisance. Cell phones are everywhere these days. According to the

Cellular Telecommunications and Internet Association, almost 195

million people in the United States had cell-phone service in October

2005. And cell phones are even more ubiquitous in Europe.

In December 2004, France legalized cellphone jammers in movie

theaters, concert halls and other places with performances. France is

finalizing technology that will let calls to emergency services go through.

India has installed jammers in parliament and some prisons. It has been

reported that universities in Italy have adopted the technology to prevent

cheating. Students were taking photos of tests with their camera phones

and sending them to classmates.

Multi Jammer


9.2 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.

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 Hand Held 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.

Conclusion :

On observing the output of the frequency spectrum the VCO output is

varies from 890MHz to 960MHz. This output is fed to MMG3001 and it

is found that the mobile jammer blocks the mobile signal in 8-meter

effective radius. All the circuit output are constructed and observed using

the Electronic work bench. The simulation result and practical result are

found to be approbatory equal. The gain of the project is that we are able

to block communication coming into and going out from a GSM phone

operating on the 890MHz to 960MHz frequency band. We are also able

to reach 8-meter effective blocking radius and keep the cost less. 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.

Multi Jammer


CHAPTER 10

TV REMOTE JAMMER

In consumer electronics, are mote control is a component of an

electronic device such as a television set, DVD player, or other home

appliance, used to operate the device wirelessly from a short distance.

Remote control is a convenience feature for the consumer, and can allow

operation of devices that are out of convenient reach for direct operation

of controls.TV remote jammer is basically a IR jammer. The fundamental

technology used in TV Remotes is Infrared light. By using this circuit

you can prevent anyone by changing the channel and can watch favorite

channels without any interruption The idea behind TV remote control

jammer is sending a constant IR pulse with the carrier frequency of

the transmitter. Hence the result will be non-accepted signal from the

receiver and therefore no action will be taken. Generally Philips TV

remotes follows RC5 (Remote Control) protocol. This protocol was

developed by Philips in the late 1980s. According to this protocol, for

each button, Remote transmits 14 bits .

Commonly, remote controls are Consumer IR devices which send

digitally-coded pulses of IR radiation to control functions such as

power, volume, tuning, temperature set point, fan speed, or other

features. Remote controls for these devices are usually small wireless

handheld objects with an array of buttons for adjusting various settings

such as television channel, track number, and volume. For many

devices, the remote control contains all the function controls while the

controlled device itself has only a handful of essential primary controls.

10.1.Basic Principle

Basically the TV remote emits a sequence of pulses when you press a

button. IR transmitter is fixed to the surface of the TV remote. This IR

transmitter emits the pulses in unique configuration for each button.IR

Multi Jammer


receiver which is arranged to TV will receive these sequence of pulses

that are transmitted by TV Remote and identifies which button is pressed

in TV remote.. Most of the TV remotes have 38KHz operating frequency.

A flood of IR beams in the same frequency can easily confuse the TV

receiver and this is the operating principle of our jammer. The circuit is

nothing but an astable multivibrator based on NE555 IC. The output of

NE55 is amplified using a PNP transistor SK100 to drive the IR LEDs.

Not only TV remotes, but any IR remotes operating in the 38 KHz

frequency region can be also jammed by using this circuit. Not only TV

remotes, but any IR remotes operating in the 38 KHz frequency region

can be also jammed by using this circuit.

10.2 Purpose

The main purpose of this circuit is to jam the sensor of the TV receiver at

a particular frequency on a desired channel. As it jams the TV receiver,

it prevents the IR receiver from sensing any other signal from the TV

remote. It will also allow the user to jam the volume at a fixed range, to

avoid irritation by loud noise and also prevents from turning TV, ON or

OFF by remote.

10.3 Scope

This project is about the design and application of TV remote jammer. The

main concept of this project is to develop a circuit to block the emerging

signals from the TV remote by producing pulses from the IR sensor

connected to this circuit. By using the same jamming concept other

electronics appliances such as A.C, automatic door, remote controlled

fan can also be jammed. The future scope of this project can be

implemented by using a powerful IR diode such that it can be operated

from a long distance.

Multi Jammer


CHAPTER 11

LITERATURE SURVEY

In 2014(Nov-Dec) Chirag Gupta, Nitin Gar

Analysis of Jammer Circuit :-

The idea behind TV remote control jammer is sending a constant IR pulse

with the carrier frequency of the transmitter. Hence the result will be non-

accepted signal from the receiver and therefore no action will be taken.



transmitter emits the pulses in unique configuration for each button.IR

receiver which is arranged to TV will receive these sequence of pulses

that are transmitted by TV Remote and identifies which button is pressed

in TV remote

In 2013A. R. Yrfanean

Modelling and Simulation of the Active Jammer:-

In this paper, it analyzes the jamming effect of the IR jammer signal to

oppose the crossed array detectors reticule seeker though the simulation.

The simulation results show that the jamming effect is greatly influenced

by frequency, phase and intensity of the jammer signal. Specially, the

jammer frequency has the largest influence on the jamming effect. The

jammer frequency has to be more than a certain value to be able to affect

the seeking process. In addition to that, the jammer intensity has to be

more than a certain value related to the pulse position technique to be

able to produce effective influence on the seeker signals.

As a result the jammer has to be with appropriate parameters for

influence the guidance signals in a manner that the target will be pushed

out of the field of view and be missed, or causes an unstable situation in

Multi Jammer


the seeking making the miss distance is so large.Cell phones are full-

duplex devices, which means they use two separate frequencies, one for

talking and one for listening simultaneously.

In 2010 Johan F. Blokker

Method and apparatus for jamming IR remote control :-

Infrared remote controls are commonly used in many electronic devices

such as televisions, video cassette recorders and audio stereo components

and compact disc players. At times two persons may have different

opinions about what television channel or entertainment unit is to be

received. An example of this situations when one person uses the remote

control to change the TV channel continuously making it uncomfortable

to watch TV with them. These peoples are commonly called “channel

checkers”.

“Infrared remote controls use pulses of infrared light to

transmit information between electronic devices. Most such remote

controls send the infrared pulse pattern that represents the

transmitted information twice. The receiving devices compare the

two pulse patterns to conform that the information was received

correctly. If a difference is detected, an error in the transmission is

assumed and the transmitted information is ignored.”

In 2009 Eric B. Randall

Basics of jamming technology:-

The disclosed device uses two timer circuits to create a train of digital

pulses similar to the pulses of a remote control. The first timer is

designed to produce a pulsed wave at the same frequency used in a

modulated infrared transmission method. The second timer reduces

power consumption, which is particularly important fore hand-held,

battery powered device. Since the information transmitted by the remote

control is a long train of pulses only periodic interference is needed to

cause sufficient errors to disable the device.

Multi Jammer


CHAPTER 12

SYSTEM DEVELOPMENT

12.1 Description of Block in Project:

12.1.1 Power Supply

Figure. 12.1 Power Supply

The first section is the TRANSFORMER. The transformer steps up

or steps down the input line voltage and isolates the power supply from

the power line.

The RECTIFIER section converts the alternating current input signal

to a pulsating direct current. However, as you proceed in this chapter you

will learn that pulsating dc is not desirable. For this reason a FILTER

section is used to convert pulsating dc to a purer, more desirable form of

dc voltage.

Multi Jammer


Block diagram of a basic power supply. The first section is

transformer steps up or steps down the input line voltage and isolates the

power supply from the power line. The RECTIFIER section converts the

alternating current input signal to a pulsating direct current. However, as

you proceed in this chapter you will learn that pulsating dc is not

desirable. For this reason a FILTER section is used to convert pulsating

dc to a purer, more desirable form of dc voltage. Block diagram of a basic

power supply. The final section, the REGULATOR, does just what the

name implies. It maintains the output of the power supply at a constant

level in spite of large changes in load current or input line voltages. Now

that you know what each section does, let's trace an AC signal through

the power supply. At this point you need to see how this signal is altered

within each section of the power supply. Later on in the chapter you will

see how these changes take place. In view B of, an input signal of 115

volts ac is applied to the primary of the transformer. The transformer is a

step-up transformer with a turn ratio of 1:3. You can calculate the output

for this transformer by multiplying the input voltage by the ratio of turns

in the primary to the ratio of turns in the secondary; therefore, 115 volts

ac 3 = 345 volts ac (peak-to- peak) at the output. Because each diode in

the rectifier section conducts for 180 degrees of the 360-degree input, the

output of the rectifier will be one-half, or approximately 173 volts of

pulsating dc. The filter section, a network of resistors, capacitors, or

inductors, controls the rise and fall time of the varying signal;

consequently, the signal remains at a more constant dc level. You will see

the filter process more clearly in the discussion of the actual filter

circuits. The output of the filter is a signal of 110 volts dc, with ac ripple

riding on the dc. The reason for the lower voltage (average voltage) will

be explained later in this chapter. The regulator maintains its output.

12.1.2Circuit Diagram of Astable Multivibrator

Above figure shows the circuit diagram of a 555 Timer wired in Astable

Mode. 8th pin and 1st pin of the IC are used to give power, Vcc and GND

respectively Cell phones are full-duplex devices, which means they use

two separate frequencies, one for talking and one for listening

simultaneously The 4th pin is RESET pin which is active low and is

connected to Vcc to avoid accidental resets. 5th pin is the Control

Voltage pin which is not used. So to avoid high frequency noises it is

Multi Jammer


connected to a capacitor C’ whose other end is connected to ground.

Usually C’ = 0.01μF.Cell phones are full-duplex devices, which means

they use two separate frequencies, one for talking and one for listening

simultaneously The Trigger (pin 2) and Threshold (pin 6) inputs are

connected to the capacitor which determines the output of the timer.

Discharge pin (pin 7) is connected to the resistor Rb such that the

capacitor can discharge through Rb. Diode D connected in parallel to Rb

is only used when an output of duty cycle less than or equal.

Figure. 12.2 Circuit of Astable Multivibrator

An Astable Multivibrator is an oscillator circuit that continuously

produces rectangular wave without the aid of external triggering. So

Astable Multivibrator is also known as Free Running Multivibrator. I

have already posted about Astable Multivibrator using Transistors.

Astable Multivibrator using 555 Timer is very simple, easy to design,

very stable and low cost. It can be used for timing from microseconds to

https://electrosome.com/astable-multivibrator-transistors/

https://electrosome.com/555-timer-ic/

Multi Jammer


hours.Cell phones are full-duplex devices, which means they use two

separate frequencies, one for talking and one for listening simultaneously

Due to these reasons 555 has a large number of applications and it is a

popular IC among electronics hobbyists. To 50% is required. For the sake

of explain the working –

Design of Astable Multivibrator

Capacitor charges up to 2/3Vcc (the upper comparator limit) which is

determined by the 0.693(R1+R2)C combination and discharges itself

down to 1/3Vcc (the lower comparator limit) determined by the

0.693(R2.C) combination. The individual times required to complete one

charge and discharge cycle of the output is therefore given as:

Astable 555 Oscillator Charge and Discharge Times

T1 = 0.693(R1+R2)

T2 = 0.693*R2*C

Figure.12.3 Output Waveform of Astable multivibrator

Multi Jammer


When connected as an astable multivibrator, the output from the 555

Oscillator will continue indefinitely charging and discharging between

2/3Vcc and 1/3Vcc until the power supply is removed. As with the

monostable multivibrator these charge and discharge times and therefore

the frequency are independent on the supply voltage. The duration of one

full timing cycle is therefore equal to the sum of the two individual times

that the capacitor charges and discharges added together and is given as:

1. 555 Oscillator Cycle Time

T = t 1+ t 2= 0.693(R1+2R2)*C

The output frequency of oscillations can be found by inverting the

equation above for the total cycle time giving a final equation for the

output frequency of an Astable 555 Oscillator as:

2. 555 Oscillator Frequency Equation

By altering the time constant of just one of the RC combinations, the

Duty Cycle better known as the “Mark-to-Space” ratio of the output

waveform can be accurately set and is given as the ratio of resistor R2 to

resistor R1.Cell phones are full-duplex devices, which means they use

two separate frequencies, one for talking and one for listening

simultaneously. The Duty Cycle for the 555 Oscillator, which is the ratio

of the “ON” time divided by the “OFF” time is given by:

Multi Jammer


3. 555 Oscillator Duty Cycle

The duty cycle has no units as it is a ratio but can be expressed as a

percentage ( % ). If both timing resistors, R1 and R2 are equal in value,

then the output duty cycle will be 2:1 that is, 66% ON time and 33% OFF

time with respect to the period.

Working Principle Diagram:

Figure.12.4 Principle Diagram of IC555

Figure above shows an astable multivibrator implemented using the 555

IC together with an external resistor RA, RB and an external capacitor C.

Multi Jammer


When the circuit is switched ON, the capacitor (C) voltage will be

less than 1/3 Vcc. So the output of the lower comparator will be

HIGH and of the higher comparator will be LOW. This SETs the

output of the SR Flip-flop.

Thus the discharging transistor will be OFF and the capacitor C

starts charging from Vcc through resistor RA & RB.

When the capacitor voltage will become greater than 1/3 Vcc ( less

than 2/3 Vcc ), the output of both comparators will be LOW and

the output of SR Flip-flop will be same as the previous condition.

Thus the capacitor continuous to charge.

When the capacitor voltage will becomes slightly greater than 2/3

Vcc the output of the higher comparator will be HIGH and of

lower comparator will be LOW. This resets the SR Flip-flop.

Thus the discharging transistor turns ON and the capacitor starts

discharging through resistor Rb.

Soon the capacitor voltage will be less than 2/3 Vcc and output of

both comparators will be LOW. So the output of the SR Flip-flop

will be the previous state

So the discharging of capacitor continuous.

When the capacitor voltage will become less than 1/3 Vcc, the

output SETs since the output of lower comparator is HIGH and of

higher comparator is LOW and the capacitor starts charging again

This process continuous and a rectangular wave will be obtained at

the output.

But we can also connect the 555 timer IC in an Astable mode to

produce a very stable 555 Oscillator circuit for generating highly

accurate free running waveforms whose output frequency can be

Multi Jammer


adjusted by means of an externally connected RC tank circuit

consisting of just two resistors and a capacitor.

The 555 Oscillator is another type of relaxation oscillator for

generating stabilized square wave output waveforms of either a

fixed frequency of up to 500 kHz or of varying duty cycles from 50

to 100%. In the previous 555 Timer tutorial we saw that the

monostable circuit produces a single output one-shot pulse when

triggeredon its pin 2 trigger input.

Whereas the 555 monostable circuit stopped after a preset time

waiting for the next trigger pulse to start over again, in order to get

the 555 Oscillator to operate as an astable multivibrator it is

necessary to continuously re-trigger the 555 IC after each and

every timing cycle.

This re-triggering is basically achieved by connecting the trigger

input (pin 2) and the threshold input (pin 6) together, thereby

allowing the device to act as an astable oscillator.. Also the single

timing resistor of the previous monostable multivibrator circuit has

been split into two separate resistors, R1 and R2 with their junction

connected to the discharge input (pin 7) as shown below.

Thus the discharging transistor will be OFF and the capacitor C

starts charging from Vcc through resistor RA & RB.

When the capacitor voltage will become greater than 1/3 Vcc ( less

than 2/3 Vcc ), the output of both comparators will be LOW and

the output of SR Flip-flop will be same as the previous condition.

Thus the capacitor continuous to charge.

When the capacitor voltage will becomes slightly greater than 2/3

Vcc the output of the higher comparator will be HIGH and of

lower comparator will be LOW. This resets the SR Flip-flop.

Multi Jammer


FIGURE 12.5 Circuit Diagram of TV Remote Jammer Using IC 555

The idea behind TV remote control jammer is sending a constant IR pulse

with the carrier frequency of the transmitter. Hence the result will be non-

accepted signal from the receiver and therefore no action will be taken.



transmitter emits the pulses in unique configuration for each button.

IR receiver which is arranged to TV will receive these sequences of

pulses that are transmitted by TV Remote and identify which button is

pressed in TV remote.

Generally Philips TV remotes follows RC5 (Remote Control) protocol.

This protocol was developed by Philips in the late 1980s. According to

this protocol, for each button, Remote transmits 14 bits. The below figure

shows the frame format of RC5 protocol.

Multi Jammer


Figure 12.6 RC frame format

12.2. RC-5 Frame Format

The first two pulses are start bits, and both are logic 1.

The 3rd bit is toggle bit. This bit toggled every time when a button is

pressed or released. Using this bit, we can identify weather the button is

pressed or not.

The next 5 bits represent the device address. Bit 4 is the MSB of the

device address and bit 8 is the LSB of the device.

Last six bits in the frame format are command bits. These command bits

varies for each button in the remote. Using these command bits, we can

identify which button is pressed in IR remote.

Multi Jammer


CHAPTER 13

HARDWARE DESCRIPTION

13.1 Power Supply Design

Power is the first and the most important part of our project.for our

project we require +9 V power supply with current rating 1mA.

Figure 13.1 Power Supply Design

This is a circuit of a 9V power supply using LM7809 IC. LM7809 is a

famous IC with many features like, output current 1mA, fixed output

voltage 5 volt to 9 volt, thermal shutdown, current limiting etc. Cell

phones are full-duplex devices, which means they use two separate

http://www.circuitstoday.com/wp-content/uploads/2008/04/9v-regulator-circuit.JPG

Multi Jammer


frequencies, one for talking and one for listening simultaneously The

circuit uses a 16V output transformer from 230V mains.

13.2 Component List

Part Value

Resistor’s 1/4 Watt 5%

R1 1K -Brown, Black, Red, Gold

R2 470 – yellow, violet, brown, gold

R3 1.5K – Brown, Green, Red, Gold

R4 220 – Red, Red, brown, gold

Capacitor’s

C1, C2 10nF – Polyester or Ceramic Capacitor

C3* Add a 100nF bypass capacitor in parallel with the 9-

volt battery

Semiconductors

IC1 555 – Integrated circuit timer, can be NE555,

LM555 or other prefix

2N3906 Q1

LED1,

LED2 Infrared LEDs used in remote controls

Several

P1 pot of 4.7K

Printed circuit board, 9v battery, battery clip, wires, soldering,

box, etc.

Multi Jammer


13.3 Photo of Project

Electrical News

Figure 13.2 Project photo

13.4 SYSTEM TESTING

Install the circuit:

I hot glued the circuit inside the remote control. I also had to remove 2

posts to make room for the 9 volt battery. Tape down the LED's near the

existing LED.I used the existing switch on the remote and wired my 9

volt battery to it.

1. I tapped into this switch for my power

2. The 2 new IR LED's taped down

3. Jammer circuit with 9 volt battery

Multi Jammer


Test it out:

You may have to tinker with the 10k pot to get the frequency right for the

device you are targeting. Adjust the pot while the remote is 'on' and test it

with the original remote until the jammer confuses the device. Now, just

pull out the remote whenever you need to take control of your device and

no one will have any idea what's going on. You can bring this to a friends

house and drive them nuts! Have fun, be safe!

1. 10k variable resistor needs to be adjusted to obtain the correct

frequency.

2. Power switch wiring that goes to the remote switch

How Does it Work?

This is a pretty simple concept. When you press a button on a remote

control for a TV, stereo or other IR device, it creates a series of pulses

which the receiver in the target device; in this example, a TV, decodes

into the corresponding function. This frequency is around 35-40 kHz. To

confuse the receiver, this jammer sends out a steady stream of binary

code (1's and 0's) at the same frequency, but contains no information to

decode. The receiver basically sits there and does not respond at all and

the real information cannot get through to it as long as the jammer is on.

Voila! You've 'jammed' your TV remote.

13.5 ADVANTAGES AND DISADVANTAGES

TV Remote Control Jammer Circuit Advantages:

We can use this circuit to jam the remote signals so that the

other people cannot change the channel while watching our

favorite program on TV.

It will not affect the signal receiving capacity of the TV.

The circuit should be tuned correctly to 38 KHz frequency

Multi Jammer


CONCLUSION

TV remote jammer circuits have both advantages and disadvantages,

these can be considered as good and bad both depending on the signal

intended to be jammed. Simple jammer circuits can be pretty easily

constructed; however subtle circuit can be made for higher requirements

Sling Media struck it big by simplifying a process that has been

around for a while, but mostly in high-tech circles. There are free

downloads available, like Video LAN, that let you stream any video

signal (as well as pictures and music) from your home PC over the

Internet, but these applications typically require a host PC along with a

deeper level of technological expertise than the general public is

comfortable with. The Sling box offers place shifting functionality in a

device that's about as complicated to set up as a cable box and doesn't

require a host computer. Sling box is flying off the shelves because it

makes remote viewing accessible to the masses.

Sony's Location Free TV is a comparable product it's $200 and it has

very similar functionality. In addition to computers, Location Free TV

also directs a video signal to a PSP. TiVo Desktop lets you watch your

pre-recorded TiVo programs on your PC, Internet-connected laptop or a

wide selection of handheld media players. If you have a TiVo Series 2

box or a TiVo HD DVR and you don't need to watch a show in real-time,

this could be a good way to go -- there's no additional hardware or service

fees involved. There are also some free downloads out there, such as Orb

and Video LAN, that let you watch your TV programming from a

computer. Video LAN is combination media player/server that supports

both Linux and Mac OS in addition to Windows machines, and Orb can

stream content to Web-enabled smart phones and PDAs in addition to

computers.

To stay ahead of the competition, Sling Media is in constant upgrade

mode. Sling Media offers an HD version of Sling box. The Solo and PRO

models can accept HD content, but they both down-convert the signal

into a standard definition format before streaming it to your device. Only

the Sling box PRO-HD can stream HD content to other devices.

http://electronics.howstuffworks.com/psp.htm

Multi Jammer


The big issue right now surrounding "place shifting" TV is about

copyright and digital rights issues. Like the music and motion-picture

industries, the TV industry is concerned that people are going to be able

to access their product for free. In the case of Sling box, it's not just a

concern about one person subscribing to HBO and giving their friends

their Sling box access codes so they can watch "Rome" without paying

for it. The spatial nature of TV licensing adds another dimension to the

risk. TV stations typically purchase program rights for a specific region,

so "place shifting" the TV signal infringes on regional access rights for

certain shows. Sling Media says it's observing copyright and digital

media laws because the Sling box is a one-to-one transmission device.

Sling box owners can't broadcast a show to everyone they know. Only

one person can access a Sling box at a time, and if the device is used

properly, only the person who pays for the programming can watch it.

Only time will tell whether the TV industry will accept place shifting

technology like it ultimately accepted the "time shifting" capabilities of

TiVo and other DVRs. For more information on Sling box and related

topics, check out the links on the next page. Sling Catching Sling boxes

aren't the only products in Sling Media's arsenal. They also offer the Sling

Catcher, a device that can send content from the Internet (or a Sling box) .

Multi Jammer


APPENDICES

List of Components

Vero Board

Connecting wire

Power Switch

30 Amps Fuse

Soldering Lead

Soldering Iron

LEDs

240V/ 60V Transformer

12 volts D.C battery

IN9004, IN4004.1 diode

750 Ω, 750.1Ω, 100Ω, 1KΩ, 2KΩ, 22KΩ, 100KΩ, 1KΩ, 2KΩ

555 timer

12µF, 103µF, 104.2µF, 104.4µF, 104.5µF, 134.2µF, 220µF

LM555, LM741 IC, LM386, LM7805, LM117, LM7812, LM7912,

Voltage Controlled Oscillator

Crystal Oscillator 850MHz -1 GHz

monopole antenna

Radio receiver antenna

ADL5570 OR PF08109B Power Amplifier Casing

Multi Jammer


Bill of Engineering Measurement and Evaluation

S/ N NAME OF ITEM

1 Vero Board

2 Connecting Wire (inches)

3 One way Power Switch

4 30 Amp Fuse

5 30 Amps wall Plug

6 Soldering Lead (inches)

7 Soldering Iron

8 LED

9 230V/ 60V Transformer

10 12V D.C battery

11 IN9004 diode

12 IN4004 diode

13 750Ω resistor

14 100Ω resistor

15 1KΩ resistor

16 2KΩ resistor

17 22KΩ resistor

18 100KΩ resistor

19 12µF Capacitor

20 103µF Capacitor

21 104µF Capacitor

Multi Jammer


REFERENCES

1. www.HowStuffWork.com

2. En.wikipedia.org/wiki/Mobile_phone _jammer

3. Multitopic conference,2008.INMIC 2008.IEEE International

4. "Zone of silence [cell phone jammer]," Spectrum, IEEE , vol.42,

no.5,

18, May 2005

5. Sami Azzam, Ahmad Hijazi, Ali Mahmoudy. ”Smart Jammer for

mobile phone systems”

6. Mobile & Personal Communications Committee of the Radio

Advisory Board of Canada, “Use of jammer and disabler

Devices for blocking PCS, Cellular & Related Services”

7. "Zone of silence [cell phone jammer]," Spectrum, IEEE , vol.42,

no.5, 18, May 2005

8. G. K. H. Lui and R. D. Murch, Compact dual frequency PIFA

designs using LC resonators, IEEE Trans Antennas Propagat., vol.

49, pp. 10161019, July 2001.

9. M. T. Huynh and W. L. Stutzman, Ground plane effects on PIFA

antennas, USNC/URSI Radio Science.Meeting Digest, p. 223,

2000.

10. IE3D, Zeland Software. IE3D Users Manual Release 8, Zeland

Software Incorporated.

11. M. Ali, S. S. Stuchly, and K. Caputa, A wide band dual

meandersleeve antenna, J. Electromagn. Waves

12. Ahlin, L. (2012). Principles of Wireless Communications, (4th

Ed.). Spain: McGraw-Hill Education.

Multi Jammer


13. Amos, S. W. (2003). Principles of Transistor Circuit: Introduction

to the Design of Amplifiers, Receivers and Digital Circuits, (9th

Ed.). England: Hartnolls Ltd.

14. Anderson, C. E. (August 2003). The performance of a Wireless

LAN Access Node Using Antenna Beam Forming for Dynamic

and Static Users. New Jersey: Radio and Wireless Conference.

15. Andren, C. B. (January 2000). Intersil prism II radio Jamming

margin test. New Jersey: Radio and Wireless Conference.

16. Datasheet Search System. [Internet] (©2003-2006). Retrieved on

2013-0727. From: http://www.alldatasheet.com/.

17. Forrest, M. V. (2000). Engineer’s Mini Notebook, Timer, Op Amp

& Optoelectronic Circuits & Projects, (1st Ed.). New Jersey:

Master Publishing.

18. Gligor, V. D. (2007). A Note on the Denial-Of-Service Problem,

(3rd Ed.). U.S.A.: Houghton Mifflin Company.

19. Horowitz, P. Etal (2005). The Art of Electronics, (4th Ed.).

U.S.A.: Cambridge University Press.

20. How Stuff Works [Internet] (©1998-2006). Retrieved on 2013-07-

27. From: http://www.howstuffworks.com/.

21. Nigerian Communication Commission. [Internet] © (2005-2013).

Retrieved on 2013-06-02. From: http://www.ncc.org.ng/.

22. Theraja, B. L. et al (1994). A textbook of electrical technology,

(21st Ed.). Ram Nager, India: Publication a division of Nirja

Construction and Development Co., Ltd.

23. Ahmad Hijazi, GSM-900 Mobile Jammer

24. Vijay S Kamble,Mrs, Archna Wasule,Dilip S Kale, Mrs.Neema

Shikha, Antenna for mobile phone jammer, First international on

Emerging Trends in Engineering & Technology, ICETET‟ 08, 16-

18 July 2008 Pp 856-859.

Multi Jammer


25. Daniel S. V. Araujo, Jose C.A. Santos, Mauricio H.C. Cias, A dual

band steerable Cell Phone jammer, Microwave and Optoelectronic

conference 2007 IMOC - 2007,SBMO/IEEE MTT-S, Oct29-Nov

2007 pp 611-615.

26. Mobile & Personal Communications Committee of the Radio

Advisor Board of Canada, Use of jammer and disabler Devices for

blocking PCS, www.rabc. Ottawa. on.ca

27. Braun,T.;carle,G.; Koucheryavy,Y.; Tsaoussids, V.;

Wired/Wireless Internet Communication, Third International

Conference, WWIC 2005,Xanthi, Greece

28. http://tcil-india.com/new/White%20 Papers.htm

29. Theodore S Rapport, Wireless Communication, Second edition,

Pearson Education

30. http://pt.com/page/tutorials/gsm-tutorial

31. http://datasheets.maxim-ic.com/en/ds/ MAX2361-2365.pdf

32. http://www.antennafactor.com/documents/ ANT-916-PW- t.pdf

33. K.D. Prasad, Antenna & Wave Propagation, Satya Prakashan,

34. http://www.electronicsmanufacturers.com/products/rfmicrowaveo

mponents/antenna

http://www.electronicsmanufacturers.com/products/rf

Multi Jammer


mutli jammer

Engineering

Transcript of mutli jammer