Detector Detects the signal then jammer turns on and jaams the signal within the radius.

1. A
Project Report
On
Cell Phone RF Signal Detector & Jammer
Presented By :
1. Amar Raj (3rb08ec007)
2. Rishu Raj (3rb09ec060)
3. Aman Kumar (3rb09ec100)
4. Ravi Kumar (3rb10ec071)
Under The Guidance Of :
Mr. Dhiraj Deshpande
(Asst. Professor)

2. Containing
 Introduction
 Jamming Technique
 Design Parameters
 How does It Works
 Hardware Design
 Software Description
 Application
 Advantages
 Disadvantages
 Conclusion
 Introduction
 Jamming Technique
 Design Parameters
 How does It Works
 Hardware Design
 Software Description
 Application
 Advantages
 Disadvantages
 Conclusion

3. Introduction
 Mobile jammer is used to prevent mobile phones from receiving or
transmitting signals with the base stations.
 Mobile jammers effectively disable mobile phones within the defined
regulated zones.
 As with other radio jamming, mobile jammers block mobile phone use
by sending out radio waves along the same frequencies that mobile
phones use.
 Upon activating mobile jammers, all mobile phones will indicate "NO
NETWORK". Incoming calls are blocked as if the mobile phone were
off.
 When the mobile jammers are turned off, all mobile phones will
automatically re-establish communications and provide full service.
 Mobile jammer is used to prevent mobile phones from receiving or
transmitting signals with the base stations.
 Mobile jammers effectively disable mobile phones within the defined
regulated zones.
 As with other radio jamming, mobile jammers block mobile phone use
by sending out radio waves along the same frequencies that mobile
phones use.
 Upon activating mobile jammers, all mobile phones will indicate "NO
NETWORK". Incoming calls are blocked as if the mobile phone were
off.
 When the mobile jammers are turned off, all mobile phones will
automatically re-establish communications and provide full service.

4. Jamming Technique
 Spoofing :
In this kind of jamming, the device forces the mobile to turn off
itself.
 Shielding Attacks
This is known as TEMPEST or EMF shielding. This kind requires
closing an area in a faraday cage so that any device inside this
cage can not transmit or receive RF signal from outside of the
cage.
 Denial of Service
A jamming device transmits on the same radiofrequencies as the
cell phone, disrupting the communication between the phone
and the cell-phone base station.
 Spoofing :
In this kind of jamming, the device forces the mobile to turn off
itself.
 Shielding Attacks
This is known as TEMPEST or EMF shielding. This kind requires
closing an area in a faraday cage so that any device inside this
cage can not transmit or receive RF signal from outside of the
cage.
 Denial of Service
A jamming device transmits on the same radiofrequencies as the
cell phone, disrupting the communication between the phone
and the cell-phone base station.

5. Design Parameters
 The frequency bands
GSM900:
Uplink: 890-915 MHz
Down link: 935-960 MHz
In our Design the frequency must be the same as the downlink because it
needs lower power to do jamming.
The Distance to be jammed(D)
This parameter is very useful in our design since the amount of the output
power of the jammer depends on the area we need to jam.
Our design is established upon D=2.0 m for GSM 900.
 The frequency bands
GSM900:
Uplink: 890-915 MHz
Down link: 935-960 MHz
In our Design the frequency must be the same as the downlink because it
needs lower power to do jamming.
The Distance to be jammed(D)
This parameter is very useful in our design since the amount of the output
power of the jammer depends on the area we need to jam.
Our design is established upon D=2.0 m for GSM 900.

6. Design Parameters contd.
• 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.
• Free space loss {F}
The free-space loss (or path loss) is given by:
Path loss(dB)= 32.44 + 20 log d km + 20 log f(MHz)
The maximum free space loss (worst case F) happens
when the maximum frequency is used in the above equation.
 Using 960 MHz gives:
 F (dB) =32.44+20 log 0.02 + 20 log 960 which gives F =58 dB.
• 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.
• Free space loss {F}
The free-space loss (or path loss) is given by:
Path loss(dB)= 32.44 + 20 log d km + 20 log f(MHz)
The maximum free space loss (worst case F) happens
when the maximum frequency is used in the above equation.
 Using 960 MHz gives:
 F (dB) =32.44+20 log 0.02 + 20 log 960 which gives F =58 dB.

7. Process of Jamming
• Mobile Phone uses RF with a wavelength of 30 cm at 872-2170 MHz.
•Detector convert this RF signal to little current to glow LED or trigger the
buzzer.
•The output of detector goes to microcontroller where analog signal is
converted to digital signal.
•This digital signal is applied to Relay & LCD.
•The relay behave as a switch.
•The output of the Relay behaves as the i/p of the jammer circuit.
•The jammer circuit is activated for 60 sec (user specified).
• Mobile Phone uses RF with a wavelength of 30 cm at 872-2170 MHz.
•Detector convert this RF signal to little current to glow LED or trigger the
buzzer.
•The output of detector goes to microcontroller where analog signal is
converted to digital signal.
•This digital signal is applied to Relay & LCD.
•The relay behave as a switch.
•The output of the Relay behaves as the i/p of the jammer circuit.
•The jammer circuit is activated for 60 sec (user specified).

8. Hardware Description
Our Project Contains The Following Main Parts :
 Detector
 Relay
 Microcontroller
 Crystal Oscillator
 LCD
 On Chip RTC
 Regulated Power Supply
 Jammer Circuit
Our Project Contains The Following Main Parts :
 Detector
 Relay
 Microcontroller
 Crystal Oscillator
 LCD
 On Chip RTC
 Regulated Power Supply
 Jammer Circuit

9. Detector
Circuit Diagram Of the Detector

10. Detector contd.
• Mobile phone uses RF with a wavelength of 30cm at 872 to 2170 MHz.
•Mobile phone transmits the signal in the form of sine wave.
•The signal contains electromagnetic radiation which is picked up by the
receiver in the base station.
•A capacitor is used to detect RF from mobile phone considering that, a
capacitor can store energy even from an outside source and oscillate like
LC circuit.
• Mobile phone uses RF with a wavelength of 30cm at 872 to 2170 MHz.
•Mobile phone transmits the signal in the form of sine wave.
•The signal contains electromagnetic radiation which is picked up by the
receiver in the base station.
•A capacitor is used to detect RF from mobile phone considering that, a
capacitor can store energy even from an outside source and oscillate like
LC circuit.

11. Relay
A relay is an electrically operated switch. Current
flowing through the coil of the relay creates a magnetic field which
attracts a lever and changes the switch contacts. The coil current
can be on or off so relays have two switch positions and they are
double throw (changeover) switches.
Relay Circuit

12. Microcontroller
Pin Diagram

13. Microcontroller contd.
Peripheral Interface Controllers (PIC) is one of the advanced
microcontrollers developed by microchip technologies.
• RISC CPU
• Instruction Set is 35
• Operating Speed : DC-20Mhz clock input
• 200 ns instruction cycle
• 2K*14 words program memory
• 128*8 bytes data memory
• 8 level deep hardware stack
• Voltage Range : 2.0v to 5.5v
• Source or sink current : 25mA
• 8-bit, 5 channel Analog to Digital Converter
Peripheral Interface Controllers (PIC) is one of the advanced
microcontrollers developed by microchip technologies.
• RISC CPU
• Instruction Set is 35
• Operating Speed : DC-20Mhz clock input
• 200 ns instruction cycle
• 2K*14 words program memory
• 128*8 bytes data memory
• 8 level deep hardware stack
• Voltage Range : 2.0v to 5.5v
• Source or sink current : 25mA
• 8-bit, 5 channel Analog to Digital Converter

14. Crystal Oscillator
Crystal oscillator is made up of quartz crystal
with the desired value of resonant frequency forms
part of the frequency-selective feedback network.
The crystal oscillator speed that can be
connected to the PIC microcontroller range from DC
to 20Mhz.
Crystal oscillator is made up of quartz crystal
with the desired value of resonant frequency forms
part of the frequency-selective feedback network.
The crystal oscillator speed that can be
connected to the PIC microcontroller range from DC
to 20Mhz.

15. LCD
LCD screen consists of two lines
with 16 characters each. Each
character consists of 5x7dot
matrix.
Pin Details of LCD
LCD screen consists of two lines
with 16 characters each. Each
character consists of 5x7dot
matrix.

16. On Chip RTC
The real time clock (RTC) is a widely used device that
provides accurate time and date for many applications. The
RTC chip present in the PC provides time components of
hour, minute and second.
The RTC chip uses an internal battery that keeps the
time and date even when the power is off. One of the most
widely used RTC chips is the DS1307 from Dallas
semiconductor.
The real time clock (RTC) is a widely used device that
provides accurate time and date for many applications. The
RTC chip present in the PC provides time components of
hour, minute and second.
The RTC chip uses an internal battery that keeps the
time and date even when the power is off. One of the most
widely used RTC chips is the DS1307 from Dallas
semiconductor.

17. Jammer
Power Supply IF Section RF Section Jamming
Signal
Circuit Diagram
Power Supply IF Section RF Section Jamming
Signal

18. Power Supply for Jammer
Transformer Rectification Filter Regulator
Circuit Diagram
Block Diagram
Circuit Diagram

19. Signal Mixer
Triangular
Wave
Generator
If - Section
To RF
Section
Signal Mixer
To RF
Section
Noise
Generator

20. Triangular Wave Generator
• The main use of the triangle wave is to sweep the VCO through the desired
frequency range.
• We want to cover the downlink through our VCO, i.e., 935-960 MHz .
• The main use of the triangle wave is to sweep the VCO through the desired
frequency range.
• We want to cover the downlink through our VCO, i.e., 935-960 MHz .

21. Noise Generator
To achieve jamming a noise signal is mixed with the triangle wave signal
to produce the tuning voltage for the VCO. The noise will help in masking the jamming
transmission, making it look like random "noise” to an outside observer .Without the
noise generator, the jamming signal is just a sweeping, un-modulated Continuous Wave
RF carrier.
To achieve jamming a noise signal is mixed with the triangle wave signal
to produce the tuning voltage for the VCO. The noise will help in masking the jamming
transmission, making it look like random "noise” to an outside observer .Without the
noise generator, the jamming signal is just a sweeping, un-modulated Continuous Wave
RF carrier.

22. Signal mixer
The mixer here is just an amplifier that operates as a summer. So, the
noise and triangular wave will add together before entering the VCO.

23. Rf - Section
Jamming
SignalVoltage
Control
Oscillator
RF Power
Amplifiers
Antenna
From IF
section
Jamming
SignalVoltage
Control
Oscillator
RF Power
Amplifiers
Antenna

24. VCO
The voltage controlled oscillator (VCO) is the heart of
the RF-section. It is the device that generates the RF
signal which will interfere with the cell phone.
The output of the VCO has a frequency which
is proportional to the input voltage, thus, we can
control the output frequency by changing the input
voltage.
The voltage controlled oscillator (VCO) is the heart of
the RF-section. It is the device that generates the RF
signal which will interfere with the cell phone.
The output of the VCO has a frequency which
is proportional to the input voltage, thus, we can
control the output frequency by changing the input
voltage.

25. Power Amplifier
Since 5 dBm output powers from the VCO do not achieve the desired
output power of the GSM jammer, we had to add an amplifier with a
suitable gain to increase the VCO output to 34 dBm.
Since 5 dBm output powers from the VCO do not achieve the desired
output power of the GSM jammer, we had to add an amplifier with a
suitable gain to increase the VCO output to 34 dBm.

26. Antenna
A proper antenna is necessary to transmit the
jamming signal. In this project, we used three 1/4
wavelength monopole antennas, with 50 Ω input
impedance so that the antennas are matched to the
system. We used monopole antenna since the
radiation pattern is omni-directional.
GSM 900 antenna Specifications:
1. Frequency: 850MHz-1GHz
2. Input impedance 50Ω
3. VSWR<2
A proper antenna is necessary to transmit the
jamming signal. In this project, we used three 1/4
wavelength monopole antennas, with 50 Ω input
impedance so that the antennas are matched to the
system. We used monopole antenna since the
radiation pattern is omni-directional.
GSM 900 antenna Specifications:
1. Frequency: 850MHz-1GHz
2. Input impedance 50Ω
3. VSWR<2

27. Software Description
Softwares used in
this project
Express PCB –
for designing
circuit
Express PCB –
for designing
circuit
PIC C compiler -
for compilation
part
PIC C compiler -
for compilation
part
Proteus 7
(Embedded C) –
for simulation
part
Proteus 7
(Embedded C) –
for simulation
part

28. •Express PCB
Express PCB is a software tool to design PCBs specifically for manufacture by the
company Express PCB (no other PCB maker accepts Express PCB files). It is very easy
to use.
•PIC C compiler
PIC compiler is software used where the machine language code is written and
compiled. After compilation, the machine source code is converted into hex code
which is to be dumped into the microcontroller for further processing.
•Proteus 7
Proteus is software which accepts only hex files. Once the machine code is converted
into hex code, that hex code has to be dumped into the microcontroller and this is
done by the Proteus.
Express PCB is a software tool to design PCBs specifically for manufacture by the
company Express PCB (no other PCB maker accepts Express PCB files). It is very easy
to use.
•PIC C compiler
PIC compiler is software used where the machine language code is written and
compiled. After compilation, the machine source code is converted into hex code
which is to be dumped into the microcontroller for further processing.
•Proteus 7
Proteus is software which accepts only hex files. Once the machine code is converted
into hex code, that hex code has to be dumped into the microcontroller and this is
done by the Proteus.

29. Applications
•Gas stations, the air entrainment station, the fuel
depot and the flammable explosive chemical
warehouse, the refinery, the petrified factory and so on
need safely to protect place
•Governments, enterprise's each kind of
conference room
•Armies, public security department's important
conference rooms
•Hospitals, Courts, Theatres etc.
•Gas stations, the air entrainment station, the fuel
depot and the flammable explosive chemical
warehouse, the refinery, the petrified factory and so on
need safely to protect place
•Governments, enterprise's each kind of
conference room
•Armies, public security department's important
conference rooms
•Hospitals, Courts, Theatres etc.

30. Advantages
•Easy to operate.
•Low power consumption.
•Efficient design.
•Eliminates button operations.
•No need for training.
•Fast response.
•Sophisticated security.
•Simple and Reliable Design
•Easy to operate.
•Low power consumption.
•Efficient design.
•Eliminates button operations.
•No need for training.
•Fast response.
•Sophisticated security.
•Simple and Reliable Design

31. Disadvantages
•Radiation harmful for humans
•We may lose some important calls.

32. Result, Conclusion & Future Scope
Result:
•The project “Cell Phone RF Signal detector and Jammer” was designed to help for security
purpose.
• The activation and deactivation time schedules can be programmed with microcontroller.
Conclusion:
Integrating features of all the hardware components used have been developed in it. Presence of
every module has been reasoned out and placed carefully, thus contributing to the best working
of the unit. Secondly, using highly advanced IC’s with the help of growing technology, the
project has been successfully implemented. Thus the project has been successfully designed and
tested.
Future Scope:
Our project “Cell Phone RF Signal detector and Jammer” is mainly intended to provide an
interaction with detector and Jammer.
This project can be extended to block the signal of 3G & 4G.
Due to lack of components we won’t be able to do this.
Result:
•The project “Cell Phone RF Signal detector and Jammer” was designed to help for security
purpose.
•The activation and deactivation time schedules can be programmed with microcontroller.
Conclusion:
Integrating features of all the hardware components used have been developed in it. Presence of
every module has been reasoned out and placed carefully, thus contributing to the best working
of the unit. Secondly, using highly advanced IC’s with the help of growing technology, the
project has been successfully implemented. Thus the project has been successfully designed and
tested.
Future Scope:
Our project “Cell Phone RF Signal detector and Jammer” is mainly intended to provide an
interaction with detector and Jammer.
This project can be extended to block the signal of 3G & 4G.
Due to lack of components we won’t be able to do this.

33. THAnk u alL.