Final Cellphone Jammer Complete Notes
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CHAPTER-1
INTRODUCTION
1.1 What is Mobile Jammer?
The main purpose of a cell phone jammer is to jam a cell phone signal in
a designated area. Cell phone jammer is radio frequency equipment which
produces a RF signal to beat the cell phone frequency and effectively jam the
signal which results no service to any type of cell phone such as CDM and
!"M in the range of #$$M%& to '$$M%&.
The jammer described here is for '$$M%& range s well as it can be operated
via infrared rays using any T.(. Remote) The main application of this circuit is that
we can control any appliance in a wor*shop or in an industry by just being in our
wor*ing place . This is very much helpful for elderly people as well as for those
who are unable to wal* either due to physical disabilities or due to accidents. This
circuit enables us to control appliances in the top floor also. nother major use of
our project is that we can turn off the operating devices all together at one shot by
just pressing the power button.
Time saving as it is operated by a remote. Controlling all devices from one place.
More secure as there is no direct contact with the appliance.by using a standard
Remote control. The system is used to switch on+off up to si, electrical devices. ll
the above processes are controlled by the -C CD$/0 . The Microcontroller
receives the -nfrared "ignal from the receiver and it decodes and switch on+off the
appropriate Device. The Range of the system is unto /$ meters. The project can
switch on+off electrical devices of ma,imum load current of 1mperes. %igh
power loads can also be connected by changing the Relay and the devices will
come to the original state after the power failure. The -C is used receive the
-nfrared signal from the Transmitter) the received signal is processed by the
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CD$/0 and according to the signal the corresponding device is switched 2n+off.
ny RC1 remote control can be used to control this circuit.
The remote we use sends a train of bits 3$4s and /4s5 of some fi,ed length
modulated with a 6# 7%& infrared signal. The sequence of bits which the remotesends is decided by a particular protocol *nown as RC81 protocol. 9ower "aving
:sing Time 2perated ;lectrical ppliance Controlling "ystem is a reliable circuit
that ta*es over the tas* of switch on+off the electrical devices with respect to time.
This project replaces the Manual "witching. -t has an -nbuilt Real Time Cloc*
which trac*s over the Real Time. ecause we can use a
cell phone from just about anywhere to tal* to anybody it is one of the greatest
inventions for social and business life today.
;ven though cell phones have many advantages it eventually arises problems
such as their potential use to invade privacy) contribute to academic cheating)
even aid in industrial espionage. -ts great to call anyone at anytime.
:nfortunately) restaurants) concerts and temples all suffer from the spread of
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cell phones because not all cell phone users *now when to stop tal*ing.
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1. PROJECT O!JECTI"E#
The project involves the design and development of cell phone jammers to bloc*
all the cell phones within the designated area. This device will disrupt cellular
communication with respect to the following@
• 2perate in the '$$M%& band.
• -t has a two meter effective bloc*ing radius
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CHAPTER-
$%$TEM CONCEPT
.1 A!OUT JAMMER
The heart of the system is the RF oscillator .The frequency of the oscillator is '$$
M%&. This is the carrier frequency of the jammer. This frequency is modulated by
the modulating signal given to the base of the transistor and the modulated output is
obtained across the collector terminal. This modulated output is connected to the
antenna) which converts the electric signal into electromagnetic signal and transmits
it into the space.
The receiver) which is the cell phone in our case) receives the transmitted signal and
tries to demodulate the signal. "ince this signal is not within the bandwidth of the
cell it displays A=etwor* >usyA on the BCD panel. "ince the power of the
transmitter is greater than the original signal transmitted from the cell phone tower
the cell phone will not respond to the original signal.
This project effectively jams the cell signals. The heart of the circuit is formed by
the MC:) which is used to generate a square wave. This signal is fed to the
integrator and it is mi,ed with noise which is generated by the noise generator in the
active mi,er. This low level signal is feed to (C2 circuit module) which generates
the equal frequency of RF spectrum to be jammed. The RF signal is then feed into a
critical tuned >9F and is feed to amplifier then the amplified signal is fed to high
power RF module for further amplification and terminated to antenna.
;lectronically spea*ing) cell8phone jammers are very basic devices. The simplest
just have an on+off switch and a light that indicates its on. More comple, devices
have switches to activate jamming at different frequencies.
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CHAPTER &
!'OC( DIA)RAM O* JAMMER
Figure ./ >loc* Diagram of Mobile ?ammer
Micro
Controller
BCD
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Figure . >B2C7 D-!RM 2F -=FRR;D TR-!!;R-=! C-RC:-T
&.1 !'OC( DIA)RAM DE$CRIPTION
&.1.1 MICROCONTRO''ER
The Microcontroller we used here is T#'C1/) manufactured by tmel Company. -t is
used to generate square wave. -t is a $8pin -C. -ts cloc* frequency is //.$1' M%&.
its output is given to integrator. Microcontroller has a dedicated input device and
often has a small B;D or BCD display for output. %ere the square wave is used as
a carrier wave.
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&.1. INTE)RATOR
-t ta*es input as the square wave generated from Microcontroller) and converts it into
a triangular wave. -deally) we want a ArampA or AtriangleA waveform which is fed to
mi,er and then this signal is applied to the voltage tune pin on an e,ternal
(oltage Controlled 2scillator 3(C25) the resulting RF output will be AsweptA across
the entire tuning band. This is what is needed for wideband jamming applications.
&.1.& NOI$E )ENERATOR
-t generates a noise signal and it is mi,ed with the triangle wave signal . This noise
will help in mas*ing the jamming transmission) ma*ing it loo* li*e random
Enoise to an outside observer.
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The output from (C2 is fed to RF amplifier for further amplification.
&.1. R* AMP'I*IER
-t is a device which may ta*e a small RF signal and amplify it. The cheap G easiest
source of these amplifiers is from old cellular phones themselves. "ome cellular
phones will use broadband RF power AhybridA modules which helps to ma*e
their construction easier and smaller. These RF module devices tend to be very
widebanded) and will easily amplify RF signals outside of their intended range.
-ncreasing the modules bias) power control) or (dd voltage can also mil* a little
more gain out of them. The modules will need to be connected to a large) smooth
heatsin* and may also require a cooling fan.
&.1./ 'I0UID CR%$TA' DI$P'A%
Biquid crystal display a type of display used in digital watches and many portable
computers. BCD displays utili&e two sheets of polari&ing material with a liquid
crystal solution between them. n electric current passed through the liquid causes
the crystals to align so that light cannot pass through them. ;ach crystal) therefore) is
li*e a shutter) either allowing light to pass through or bloc*ing the light.
Microcontroller directs BCD to display the character that is programmed in the
software.
1.1.1 &.1. ANTENNA
ntenna is used to radiate transmitting frequency and generates RF energy. ;very
jamming device has an antenna to send the signal. ntennas are e,ternal to
provide longer range and may be tuned for individual frequency. ntenna used
is a omnidirectional) which radiates signal uniformly in all direction and converts
electrical signal into electromagnetic waves.
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&.1. POWER $UPP'%
ll the electronic components starting from diode to -ntel -C4s only wor* with a DC
supply ranging from H1( to H/(.
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CHAPTER +
+.1 Mobile Jammi23 Te4h2i56es
There are various types of jamming devices available which are using different jammingtechniques.
• Type AA Device
• Type A>A Device
• Type ACA Device
• Type ADA Device
• Type A;A Device
+.1.1 T78e 9A9 De:i4e
Type AA Devices are simple ?ammer.This type of device comes equipped with several
independent oscillators transmitting jamming signals capable of bloc*ing frequencies
used by paging devices as well as those used by cellular systems control channels for call establishment.
+.1. T78e 9!9 De:i4eType A>A Devices are also *nown as -=T;BB-!;=T C;BB:BR D-">B;R".
:nli*e jammers) Type > devices do not transmit an interfering signal on the controlchannels. The device) when located in a designated quite area) functions as a detector. -t
has a unique identiIcation number for communicating with the cellular base station.
+.1.& T78e 9C9 De:i4e
Type ACA Devices are also *nown as -ntelligent >eacon Disablers. :nli*e 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 compatibleterminal is instructed to disable its ringer or disable its operation) while within thecoverage area of beacon.
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+.1.+ T78e 9D9 De:i4e
Type ADA Devices are Direct Receive Transmit ?ammers. This jammer behaves li*e asmall) independent and portable base station) which can directly interact intelligently
unintelligently with the operation of the local mobile phone. The jammer is
predominantly in receive mode and will intelligently choose to interact and bloc* thecell 9hone directly if it is within close pro,imity of the jammer.
+.1. T78e 9E9 De:i4e
Type A;A Devices are used for ;M- "hield 8 9assive ?amming. This technique is using
;M- suppression techniques to ma*e a room into what is called Faraday cage. lthough
labor intensive to construct) the Faraday cage essentially >loc*s or greatly attenuates)
virtually all electromagnetic radiation from entering or leaving the cage or in this case atarget.
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CHAPTER
COMPONENT$ o; MO!I'E JAMMERComponents of a mobile jammer include@
• (oltage Controlled 2scillator3(C25
• Tuning Circuit
• =oise "ource
• RF mplifcation :nit
• Transmitting ntenna
.1 "olta3e Co2trolle< Os4illator="CO>
(C2 is the most important among other parts. -t is li*e a heart of our jammer. (C2 can
be built using op8amps) resistors and capacitors) but the low cost) availability and
reliability of prefabricated (C2s ma*e it optimum to just purchase it. (C2 producesRF signal which will interact with the bloc*ed device. Firstly we must select frequencies
which will be used in our signal bloc*ing device. -t is also important to thin* about its
si&e because we might wish to create a des*top mobile phone jammer or a portable
handheld jamming device.
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Figure 1./ %ardware of (oltage Controlled 2scillator
. T62i23 Cir46it
Tuning Circuit can be of two types@
• open8loop
• feedbac*
2pen8loop is quite simple and requires just a few op8amps with additional passive
components.-t is a sawtooth8wave generator which ma*es (C2 to go from lowest to
highest frequency. The feedbac* is using 9BB to adjust the (C2s frequency constantly.For this purpose we need to use microcontroller. -t is programmed once and then
connected to the (C2) thus it is not adjustable.
.& Noise 3e2erator
9roduces random electronic output in a speciIed frequency range to jam the cell8phone
networ* signal 3part of the tuning circuit5.
.+ R* Am8li;4atio2 U2it
RF mplifcation :nit is what we need when we wish to increase the area covered byour jammer along with its signal bloc*ing power. The more power has our signal
bloc*er) the bigger radius it jams. The cost is) as we may guess) battery wor*ing time.
More power equals less time for battery to live.
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Figure 1. RF mplification :nit
. Tra2smitti23 A2te22a
Transmitting ntenna is a tool which transmits signals produced by your jammer. The
main characteristic of antenna is ("
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CHAPTER
DE$I)NIN)
.1 Desi32 Parameters@ $8e4i;4atio2 o; mobile ammer
There are various types of jamming devices available which are using different jamming
techniques.
• The frequency bands
• Distance to be jammed 3D5
• ?amming8to8signal ratio ?+"
• 9ower calculations
• Free space loss
The ?amming Coverage rea for a particular model jammer should be considered a!eneral or typical area of coverage. The situation may vary and is specification the site.
;very ?MM-=! D;(-C; outputs a ?MM-=! "-!=B on one or more frequencies
at a particular 2:T9:T 92
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roughly equal to signal power at the receiver. The effects of jamming depend on the)
?amming8to8signal ratio
3?+"5 ) Modulation scheme) Channel coding and -nterleaving of the target system.
!enerally ?amming8to8"ignal ratio can be measured according to the following
;quation.
r L communications receiver bandwidth
>j L jamming transmitter bandwidth
Rtr L range between communications transmitter and receiver
Rjt L range between jammer and communications receiver
Bj L jammer signal loss 3including polari&ation mismatch5
Br L communication signal loss
The above ;quation indicates that the jammer ;ffective Radiated 9ower) which is the
product of ntenna gain and output power) should be high if jamming efficiency isrequired. 2n the other hand) in 2rder to prevent jamming) the antenna gain toward thecommunication partner should be as high as 9ossible while the gain towards the jammer
should be as small as possible. s the equation shows) the ntenna pattern) the relation
between the a&imuth and the gain) is a very important aspect in jamming. lso as we*now from Microwave and shown in the equation distance has a strong influence on the
"ignal loss. -f the distance between jammer and receiver is doubled) the jammer has to
quadruple its 2utput in order for the jamming to have the same effect. -t must also be
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'(
noted here that jammer path Boss is often different from the communications path loss
CHAPTER /
POWER $UPP'%
X
Figure 0./ C-RC:-T D-!RM 2F H'( G H/( F:BB
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Figure 0. ?MM;R C-RC:-T
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Figure 0.6 C-RC:-T D-!RM 2F -=FRR;D TR-!!;R-=! C-RC:-T@
/.1 CIRCUIT DE$CRIPTION
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/.1.1 $te8-
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%ere Capacitor C/ is used for filtering purpose and connected across the rectifier
output. -t filters the a.c components present in the rectified d.c and gives steady
d.c voltage. s the rectifier voltage increases) it charges the capacitor and also
supplies current to the load.
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/.1. IC CD +B1/
The CD$/0>C is a 18stage divide8by8/$ ?ohnson counter with /$ decoded outputs and a
carry out bit.
The CD$>C is a 8stage divide8by8# ?ohnson counter with # decoded outputs and a
carry8out bit.
These counters are cleared to their &ero count by a logical E/ on their reset line. These
counters are advanced on the positive
edge of the cloc* signal when the cloc* enable signal is in the logical E$ state.
The configuration of the CD$/0>C and CD$>C permits medium speed operation
and assures a ha&ard free counting sequence. The /$+# decoded outputs are normally in
the logical E$ state and go to the logical E/ state only at their respective time slot. ;ach
decoded output remains high for / full cloc* cycle. The carry8out signal completes a full
cycle for every /$+# cloc* input cycles and is used as a ripple carry signal to any
succeeding stages.
*eat6res
O
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/. MICROCONTRO''ER
The T#'C1/ is a low8power) high8performance CM2" #8bit
microcomputer with 7 bytes of flash programmable and erasable read only
memory. The device is manufactured using tmel4s high8density nonvolatile
memory technology and is compatible with the industry8standard MC"81/
instruction set and pin out. The on8chip flash allows the program memory to be
reprogrammed in8system or by a conventional nonvolatile memory programmer. >y
combining a versatile #8bit C9: with provides a highly8fle,ible and cost8effective
solution to many embedded control applications.
The microcontroller uses the oscillator which gives the frequency of
//.$1'M%&. This is internally generated by the crystal oscillator. -t is used to generate
the square wave of frequency of $81M%&. The generated square wave is precise
enough and doesnot vary. The generated square wave from pin6 of
microcontroller is provided to non8 inverting pin the integrator.
*eat6res
O Compatible with MC"81/P 9roducts
O #7 >ytes of -n8"ystem Reprogrammable Flash Memory
O ;ndurance@ /)$$$
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/..1 Des4ri8tio2
The T#'C1/ is a low8power) high8 performance CM2" #8bit microcomputer with
#7 bytes of Flash programmable and erasable read only memory 39;R2M5. The
device is manufactured using tmel4s high8density nonvolatile memory technology
and is compatible with the industry8 standard #$C1/ and #$C1 instruction set and pin
out.
The on8chip Flash allows the program memory to be reprogrammed in8system or by
a conventional nonvolatile memory programmer. >y combining a versatile #8bit C9:
with Flash on a
monolithic chip) the tmel T#'C1/ is a powerful microcomputer which providesa highly8fle,ible and cost8effective solution to many embedded control applications.
The T#'C1/ provides the following standard features@ #7 bytes of Flash) 1K bytes
of RM) 6 -+2 lines) three /K8bit timer+counters) a si,8vector two8level interrupt
architecture) a full8duple, serial port) on8chip oscillator) and cloc* circuitry. -n
addition) the T#'C1/ is designed with static logic for operation down to &ero
frequency and supports two software selectable power saving modes. The -dle
Mode stops the C9: while allowing the RM) timer+counters) serial port) and
interrupt system to continue functioning. The 9ower8down mode saves the RM
contents but free&es the oscillator) disabling all other chip functions until the ne,t
hardware reset.
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Figure 0. >loc* Diagram 2f Microcontroller
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Figure 0.1 9in Diagram 2f Microcontroller
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/.. PIN DE$CRIPTION
• "CC8"upply voltage.
• )ND8!round.
•
Port 89ort is an #8bit bi8directional -+2 port with internal pull ups. The 9ort output buffers can sin*+source four TTB inputs.
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• A'E@PRO)8
ddress Batch ;nable is an output pulse for latching the low byte of the addressduring accesses to e,ternal memory. This pin is also the program pulse input
39R2!5 during Flash programming. -n normal operation) B; is emitted at a
constant rate of /+K the oscillator frequency and may be used for e,ternal timing
or cloc*ing purposes. =ote) however) that one B; pulse is s*ipped during eachaccess to e,ternal data memory.-f desired) B; operation can be disabled by
setting bit $ of "FR location #;%.
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/.& 'M&N
The BM61# series consists of two independent) high gain internally frequency
compensated operational amplifiers which were designed specifically to operate from
a single power supply over a wide range of voltages. 2peration from split power
supplies is also possible and the low power supply current drain is independent of the
magnitude of the power supply voltage.The obtained square wave is integrated to
obtain the ramp or triangular signal. n integrator circuit produces a steadily
changing output voltage for a constant input voltage.
pplication areas include transducer amplifiers) dc gain bloc*s and all the
conventional op amp circuits which now can be more easily implemented in single
power supply systems. For e,ample) the BM61# series can be directly operated
off of the standard H1( power supply voltage which is used in digital systems
and will easily provide the required interface electronics without requiring the
additional S/1( power supplies.
/.+ T'B/
The TB$0) are high speed ?F;T input dual operational amplifiers incorporating well
matched) high voltage ?F;T and bipolar transistors in a monolithic integrated circuit.
The devices feature high slew rates) low input bias and offset current) and low
offset voltage temperature coefficient. -t has a low harmonic distortion) high slew
rate) low input bias and a offset current and output short circuit protection.
/. 'M&
The BM6#K is a power amplifier designed for use in low voltage consumer
applications. The gain is internally set to $ to *eep e,ternal part count low) but
the addition of an e,ternal resistor and capacitor between pins / and # will increase
the gain to any value up to $$. The inputs are ground referenced while the output
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is automatically biased to one half the supply voltage. The quiescent power drain is
only milliwatts when operating from a K volt supply) ma*ing the BM6#K ideal
for battery operation.-t has a low quiescent current drain.
/. A)B&-
The !K$68#K is a general8purpose buffer amplifier that offers high dynamic
range in a low8cost surface8mount pac*age. The !K$68#K consists of Darlington
pair amplifiers using the high reliability -n!a9+!as %>T technology process
technology and only requires DC8bloc*ing capacitors) a bias resistor) and an inductive
RF cho*e for operation. The broadband MM-C amplifier can be directly applied to
various current and ne,t generation wireless technologies such as !9R") !"M)
CDM) and
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CHAPTER
PRO)RAMMIN)
.1 $OURCE CODE
includeUreg1/.hV
include lcd.h
sbit rs L 96WK
sbit en L 96W0
sbit intIin L
96W6
sbit 7%&$Iout L 9/W$
void lcdinit35
void lcdcomnd3unsigned int c5
void lcddat3unsigned char n5
void delay35
void main35
X
unsigned char code Ych/ L AYYYY MQ YYYYYYYY A
unsigned char code Ych L A C2MM:=-CT-2="A
unsigned char code Ych L A!"M+CDM ?MM;RA
unsigned char code Ych1 L A!"M+CDM "-!=BA
unsigned char code YchK L A?MM;DA
unsigned int a
lcdinit3
5 ;
L/
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;T$ L /
TM2D L
$,//
T%$ L
$,f TB$
L $,
TR$ L /
for3aL$aU/KaHH5
X
lcddat3Ych/5
ch/ L ch/H/
Z
for3aL$aU/KaHH5
X
lcddat3Ych5
ch L chH/
Zwhile3/5
X
if 3intIin LL $5
X
for3aL$aU/KaHH5
X
lcddat3Ych5
ch L chH/
Z
Z
else
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X
for3aL$aU/KaHH5
X
lcddat3Ych15
ch1 L ch1H/
Z
for3aL$aU/KaHH5
X
lcddat3YchK5
chK L c
Z
Z
Z
Z
void lcdinit35
X
unsigned int code v[1\ L X$,6#)$,$/)$,$K)$,$f)$,#$Z
unsigned int bfor 3bL$bU1bH
H5
lcdcomnd3v[b\5
Z
void lcdcomnd3unsigned int c5
X
9$ L c
rs L $
en L /
delay35
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en L $
Z
void lcddat3unsigned char n5
X
9$ L n
rs L /
en L /
delay35
en L $
Z
void delay35
X
unsigned int g)*
for 3gL$gUL1$gH
H5
for 3*L$*UL/$*HH5
Z
void timer$Iint3void 5 interrupt /
X
T%$ L $,ff
TB$ L $,f/
7%&$Iout L ]7%&$Iout
Z
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. *'OW CHART
Display
jammermode
Boad
timervalue to
T$
Boa
dtim
er$
"ta
rttim
er$
"tart
Initia
lize
lcd
Initiali
ze
timer
-f -nt
err
u
pt
;nd
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Cha8ter
OUTPUT
. .1 RE$U'T AND ANA'%$I$
Figure /./$ M2D:B; / -=9:T
Figure './ Module / 2utput
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Figure '. M2D:B; 2:T9:T
Figure '.6 M2D:B; 6 2:T9:T
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Figure '. M2D:B; 2:T9:T
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The module was implemented as per the design considerations. The testing of the
module was done sequentially beginning with cross8chec*ing of the source code. The
9C> was
launched only after careful e,amination of the source code and the 9C> design.
was obtained the connectivity test was performed on the 9C>. 2nce the
9C> was cleared for further wor*) all the components were tested individually for
their proper wor*ing and were placed onto the 9C>.
The source code 3Microcontroller5 was compiled and debugged using 7eil software
and the program was burned or fused onto the microcontroller using tmel
9rogrammer) the other code for programming the card was compiled and debugged
using Turbo C on the 9C.
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Cha8ter 1B
'e3al Iss6es a2< Alter2ati:es o; Cell Pho2e Jammi23
1B.1 Cell Pho2e Jammi23 'e3al Iss6es
-n the :nited "tates) :nited 7ingdom) ustralia and many other countries) bloc*ing
cell8phone services 3as well as any other electronic transmissions5 is against the law. -n
the :nited "tates) cell8phone jamming is covered under the Communications ct of /'6) which prohibits people from Awillfully or maliciously interfering with the radio
communications of any station licensed or authori&edA to operate. -n fact) the
Amanufacture) importation) sale or oIer for sale) including advertising) of devices
designed to bloc* or jam wireless transmissions is prohibitedA as well. ?amming is seenas property theft) because a private company has purchased the rights to the radio
spectrum) and jamming the spectrum is a*in to stealing the property the company has purchased. -t also represents a safety ha&ard because jamming bloc*s all calls in thearea) not just the annoying ones. ?amming a signal could bloc* the call of a babysitter
frantically trying to contact a parent or a someone trying to call for an ambulance. The
Federal Communications Commission is charged with enforcing jamming laws.%owever) the agency has not yet prosecuted anyone for cell8phone.
1B. Alter2ati:es to Cell Pho2e Jammi23
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CHAPTER 11
APP'ICATION AND *UTURE DE"E'OPMENT$
11.1 APP'ICATION$
This system can be used with individual homes or !overnment 2ffices or
>usiness establishments or in ;ducational -nstitutes any where were mobile users
mobility is there.
Main pplication reas@
2il and !as "tations) Theatres) Recording "tudios) >an*s) Religious 9laces) Court
Room) Conference Rooms) 9olice G Defence Departments) Classrooms) %ospitals)
Bibraries) Tendering Rooms) Museums) 9risons) Courts) Customhouses etc.
There are various types of jamming devices available which are using different jammingtechniques.
• To maintain the complete silence in library and lecture hall.
• To avoid fraud in e,amination hall.
• To avoid disturbance in class room.
• For providing security in business conference) board of directors rooms)
seminars) etc.
• For providing calm and peaceful atmosphere in %ospitals.
• Church+Mosques+Cathedral+Temple+Religious establishment
• Cell phone jamming devices were originally developed for law enforcement and
the military to interrupt communications by criminals and terrorists. The bombs
that blew up commuter trains in "pain in March $$) as well as blasts in >ali in
2ctober $$ and ?a*arta in ugust $$6) all relied on cell phones to trigger
e,plosives. -t has been widely reported that a cell8phone jammer thwarted an
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assassination attempt on 9a*istani 9resident Musharraf in December $$6. ush visited Bondon in =ovember $$) it was reported that >ritish
police considered using jammers to protect the presidents motorcade throughBondon. During a hostage situation) police can control when and where a captor
can ma*e a phone call. 9olice can bloc* phone calls during a drug raid so
suspects cant communicate outside the area. Cell phone jammers can be used inareas where radio transmissions are dangerous) 3areas with a potentially
e,plosive atmosphere5) such as chemical storage facilities or grain elevators. The
TR?8#' jammer from ntenna "ystem "upplies -nc. carries its own electricalgenerator and can bloc* cellular communications in a 18mile 3#8*m5 radius.
Corporations use jammers to stop corporate espionage by bloc*ing voice
transmissions and photo transmissions from camera phones. 2n the more
questionable end of the legitimacy spectrum) there are rumors that hotel chainsinstall jammers to bloc* guests cell8phone usage and force them to use in8room
phones at high rates.
11. MAIN *EATURE$ O* THE PROJECT
/. #$$ M%& and '$$ M%& operated hand sets can be paraly&ed
. :ses very low output power to transmit signal and does =2 harm to human
health
6. The coverage area is a sphere area with its effective distance measured in
the radius
. Compact si&e and light weight
1. Can be installed and operated easily.
11.& *UTURE DE"E'OPMENT$
The following modifications can be made to the present circuit) which leads to still
smarter project.2ne can add many regional frequency bands to the present systemwithout much change in the hardware. The Microcontroller chip4s software can be
upgraded to handle the entire added frequency channel with the help of suitable RF
Transmitter.This project is open for developments from all sides. -t is the users4imagination which limits the wor*ing of this project. 2ne can go on adding the e,tra)
rich feature to this project
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CONC'U$ION
Cell phone jammer effectively jams the operation of cell phone such that providing
high security to man*ind. -t is fle,ible for future e,pansion also. Cell phone jammer
can be effectively used in all area for maintaining security of data. Cell phone
?ammer is an instrument used to prevent cellular phones from receiving signals
from or transmitting signals to base stations. The jamming generator must have all
technical parameter equal to a cell phone and the out put power should be more
than the signal available in that area. The tas* of jamming a cell signal or
preventing cell phone from receiving or transmitting signals is somewhat difficulty.
To achieve this tas*) the jammer must high grade of hopping generator) with good bandwidth.
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!I!'IO)RAPH%
• ;lectronic Communication "ystems ^ !eorge 7ennedy
• ;lectronics in -ndustry 8 !eorge M.Chute
• 9rinciples of ;lectronics 8 (.7.Mehta
• www.electronicsforum.com
• www.howstuffwor*s.com
• Telecommunication "witching) Traffic and =etwor*s ^ ?.;.Flood
• The #$1/ Microcontroller G ;mbedded "ystems 8 Ma&idi
• The Microcontroller -dea >oo* 8 ,elson
http://www.electronicsforum.com/http://www.howstuffworks.com/http://www.howstuffworks.com/http://www.electronicsforum.com/