STATE BOARD OF TECHNICAL EDUCATION AND TRAINING

ANDHRA PRADESH

“CELL PHONE JAMMER”

Submitted to
State Board of Technical Education and Training, A.P.
In partial fulfillment for the award of the

POLYTECHNIC

In

ELECTRONICS AND COMMUNICATION ENGINEERING

Submitted by

A.BHAVYASRI(13351EC010) B.GANESH(13351EC012)
K.BHASKAR(13351EC009) T.GANESH(13351EC013)
A.GOPICHAND(13351EC014) K.CH.VENKATESH( 13351EC011)

Under the Esteemed Guidance of

Mr.Sk. Rahil Hussain, M.TECH,
Assistant Professor

DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING

Devineni Venkata Ramana & Dr. Hima Sekhar

MIC College of Technology
Kanchikacherla, Krishna Dist, PIN: 521180, A.P, India.

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 Devineni Venkata Ramana & Dr. Hima Sekhar

MIC College of Technology

Kanchikacherla, Krishna Dist, PIN: 521180, A.P, India.

CERTIFICATE

This is to certify that, this is bonafied record of project work titled “CELL PHONE

JAMMERR” bearing RegdNo.13351EC010(A.BHAVYASRI),13351EC012(B.GANESH),

13351EC009(K.BHASKAR),13351EC013(T.GANESH),13351EC014(A.GOPICHAND),

13351EC011(K.CH.VENKATESH) students of DECE III Year of DVR & DHS MIC

COLLEGE OF TECHNOLOGY during the academic year 2013-2016, in partial fulfillment of

the requirements for the award of POLYTECHNIC in ELECTRONICS AND

COMMUNICATION ENGINEERING of State Board of Technical Education and

Training during the year 2015-16.

(Mr. SK. RAHIL HUSSAIN) (Dr. A. GURUVAREDDY)

Project Guide Head of the Department

(Dr. K. B. K. RAO)
Principal

Examiner 1 Examiner 2

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 ACKNOWLEDGEMENT
We would like to take this opportunity to express our deep gratitude to the members who
assisted us directly and indirectly for the completion of this project work.

We would like to thank Mr. Sk. Rahil Hussain, Assistant Professor, the Project
guide for his esteemed guidance and support, especially the valuable ideas and thoughts
provided during Project. He is expertise in the area of Very Large Scale Integration, which
has helped us in solving the problems encountered during the Project.

We would like to express our immense pleasure in expressing immeasurable sense of

gratitude to, Dr. A. GURUVA REDDY, Professor & Head of the Department in
Electronics and Communication Engineering for his valuable suggestions in the
completion of the Project.

We whole heartedly acknowledge Dr. K. B. K. RAO, Principal, Prof. N.

KRISHNA, Director Academics and Prof. D. PANDURANGA RAO, CEO for giving
opportunity to make this Project a successful one.

We also extend our thanks to all the faculty members of Electronics and
Communication Engineering Department for their valuable contributions in this Project.

We would like to extend our warm appreciation to all my friends for sharing their
knowledge and valuable contributions in this Project.

Finally we express our deep sense of gratitude to our parents for their continuous
support throughout our academic carrier and their encouragement in completion of this
Project successfully.

Regards

A.BHAVYASRI(13351EC010),B.GANESH(13351EC012)
K.BHASKAR(13351EC009), T.GANESH(13351EC013)

A.GOPICHAND(13351EC014),K.CH.VENKATESH(13351EC011)

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 DECLARATION

We,
13351EC004(MD.AMEENSHARIFF),13351EC001(A.ABHILASH),13351EC005(SD.A
MEENUDDIN),13351EC006(M.ANIL KUMAR), 13351EC007(SK.ASIF)of Final Year
Polytechnic, hereby declare that the matter embodied in this Project report is genuine work
done by us and has not been submitted either to this board/university or to any other
university/institute for the fulfillment of the requirement of any course of study.

Regards
A.BHAVYASRI(13351EC010)

B.GANESH(13351EC012)

K.BHASKAR(13351EC009)

A.GOPICHAND(13351EC014)

K.CH.VENKATESH(13351EC011)

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 INDEX

CHAPTER NO CONTENTS PAGE NO

Chapter-1 Abstract 6

Chapter-2 History 7

Chapter-3 Introduction to cell phone jammer 8-9

Chapter-4 Cell phone jamming Basics 10

Chapter-5 Design parameters 11

Chapter-6 Components required 12-13

6.1 The distance to be jammed 12

6.2 The frequency bands 12

3.1 Free space loses 13

Chapter-7 Cell phone jammer applications 14

Chapter-8 How cell phone jammers work 15

Chapter-9 Jamming techniques 15-16

9.1 Type “A” Device (Jammers) 15

9.2 Type “B” Device (Intelligent cellular Disablers) 16

9.3 Type “C” Device (Intelligent Beacon Disablers) 16

9.4 Type “D” Device (Direct Receive &transmit Jammers) 16

5.6 Type “E” Device (EMI Shield-passive jamming) 16

Chapte-10 Types of cell phone Jammer device 17-22

10.1 SK-6 Ultra-thin cell phone jammer 17-22

Chapter-11 Conclusion 23

Chapter-12 Bibliography 24

CHAPTER-1

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 ABSTRACT

Jammers are the devices by which we can create a temporary “dead zone “in their immediate
proximity.
There are three type of jammer.
Radar jammer
Radio jammer
Cell phone jammer

A cell phone jammer is an instrument used to prevent cellular phones from receiving and
transmitting the mobile signals to a base station. When used, the jammer effectively
disables cellular phones in the area.

Jamming basics
A jamming device transmits on the same radio frequencies as the cell phone, disrupting the
communication between the phone and the cell-phone base station in the tower. It's a called a
denial-of-service attack. The jammer denies service of the radio spectrum to the cell-phone
users within range of the jamming device.

A mobile phone jammer is an instrument used to prevent cellular phones from receiving
signals from base stations. When used, the jammer effectively disables cellular phones. These
devices can be used in practically any location, but are found primarily in places where a
phone call would be particularly disruptive because silence is expected.

The mobile jammer is in the frequency range of 890MHz to 960MHz (GSM) is developed.

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 CHAPTER -2
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 privacy or contribute to
rampant.

The rapid proliferation of cell phones at the beginning of the 21st century to near ubiquities
status eventually raised problems such as their potential use to invade privacy or contribute to
rampant and academic cheating. In addition public black lash 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. Somewhere also designed to
foil the use of certain remotely denoted explosives .

CHAPTER -3

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 INTRODUCTION
Cell phones are everywhere these days. According to the Cellular Telecommunications and
Internet Association, almost 169 million people in the United States had cell-phone service in
January 2004. And cell phones are even more ubiquitous in Europe.

A mobile phone jammer is used to block the network signals of mobile phones within a
certain range. It can jam the signals from a few hundred meters to a few kilometers. The
jammer is often used in events or places where using mobile phones could be detrimental. For
example, it can be used in cricket stadiums where viewers could place their bets on mobile
phone which is completely illegal. In some high profile business meetings using mobile
phone is totally banned. But in some cases some people may forget to switch off their phones
in these meetings and a ring from a mobile phone catching single may prove to be costly. To
avoid such situations jammers are installed in these locations so that ringing of any mobiles
can be stopped and the meeting can continue peacefully.

Mobile jammers can be installed in places such as temples and churches, business
organizations where time is money and employees are prohibited to speak on phones while
they are at work. Jammers are also useful in movie theaters and concerts. Sometimes back the
mobile jammers were used only in the defense sectors. But in present days it is used in other
sectors as well. Therefore a phone jammer is a very useful gadget as it works well even
when people forget to switch off their mobiles

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CELL PHONE JAMMER

CHAPTER-4

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 PRINCIPLE OF WORKING

Mobile phone jammer works on the principle of radio wave frequency. All the mobile
phone has the specified radio frequency under which they are operating. Phone jammers
interfere with the working frequency of the mobile phone and results in noisy and
interference frequency. In this way cell phone jammers block cell phone use by sending out
radio waves along the same frequencies that cellular phones use (as described above). This
causes plenty of interference with the communication between cell phones and signal
generated from the mobile towers.
Most cell phones use different bands to send and receive communications from towers (called
full duplexing). Jammers can work by either disrupting phone to tower frequencies or tower
to phone frequencies. Smaller handheld models block all
bands from 800MHz to 1900MHz within a 30 foot range (9 meters). Small instruments tend
to use the former method, while larger more costly models may interfere directly with the
tower. The radius of cell phone jammers can range from a dozen feet for pocket models to
kilometers for more dedicated units. The TRJ-89 jammer can block cellular communications
for a 5-mile (8 km) radius.
Their are several types of duplexing like single duplexing, double duplexing mode and
multiple duplexing. Duplexing basically defines the transfer of signal (voice signal) in a
manner. These manner are defined from the way of duplexing. Hence duplexing can carry out
the jamming of voice signals.
You could replace the 555 chip with an electrets microphone and listen to yourself talk on a
scanner, so the unit could easily couple as a UHF Bug.

CHAPTER-5

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 DESIGN PARAMETERS

Our device 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 as DCS 1800 band). We focused
on some design parameters to establish the device specifications. These parameters are as
follows:

6.1 The distance to be jammed (D)

This parameter is very important in our design, since the amount of the input power of the jammer
depends on the area that we need to jam. Latter on we will see the relationship between the output
power and the distance D. our design is established up on D=10 meters for 1800 band and
D=20meters for GSM 900 band.

UPLINK DOWNLINK USED IN JORDAN

(Handset transmit) (Handset transmit) BY

GSM900 890-915MHz 935-960 MHZ Zane +Orange

DCS 1800 1710-1785MHz 1805-1880MHz Umniah

6.2 The frequency bands

6.3 Free space losses (F)

The free space losses or path losses is given by:

The maximum free space loss happens when the maximum frequency is used in the above
equation. Using 1880 MHz gives:

F (db) = 32.44+20log0.01+20log 1880which gives F=58db

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 CHAPTER -6
COMPONENTS REQUIRED

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

JAMMING
POWER SUPLY IF SECTION RF SECTION SIGNAL

6.1 Power supply

Smaller jamming devices are battery operated. Some look like cell phone and use cell-
phone batteries. Stronger devices can be plugged in to a standard out let or wired into a
vehicle’s electrical system

TRANSFORMER RECTIFIER FILTER RECTIFIER

6.2Circuitry
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)

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• RF amplification (gain stage) - Boosts the power of the radio frequency output to high
enough levels to jam a signal

6.3Antenna:
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.

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 CHAPTER -7
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 phone 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.

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THE END

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