1. MOBILE PHONE JAMMER
DEEPAK BHOJWANI
4TH YEAR
COMPUTER SCIENCE

2. WHAT IS A MOBILE PHONE?

A mobile phone (also known as a cellular phone, cell
phone, and a hand phone) is a device that can make and
receive telephone calls over a radio link while moving around
a wide geographic area.

It does so by connecting to a cellular network provided by
a mobile phone operator, allowing access to the public
telephone network.

support a wide variety of other services such as text
messaging, MMS, email, Internet access, short-range wireless
communications
(infrared,
Bluetooth),
business
applications, gaming and photography.

3. WHAT IS A MOBILE PHONE JAMMER?

A mobile phone jammer is an instrument used to
prevent cellular phones from receiving signals from base
stations

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.

4. OPERATION

As with other radio jamming, cell phone jammers block cell
phone use by sending out radio waves along the same
frequencies that cellular phones use.

This causes enough interference with the communication
between cell phones and towers to render the phones
unusable.

Jammers can work by either disrupting phone to tower
frequencies or tower to phone frequencies.

5. COMPONENT OF A JAMMER

Antenna

Circuitry

Power supply

6. ANTENNA

Every jamming device has an antenna to send the signal.

On stronger devices, antennas are external to provide longer
range and may be tuned for individual frequencies.

7. 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

8. POWER SUPPLY

Smaller jamming devices are battery operated. Some look like
cell phones and use cell phone batteries.

Stronger devices can be plugged into a standard outlet or
wired into a vehicle's electrical system.

10. DESIGN PARAMETERS

The distance to be jammed (D)

The frequency bands

Jamming– to-signal ratio {J/S}

Free space loss {F}

11. JAMMING TECHNIQUE

TYPE A

TYPE B

TYPE C

TYPE D

TYPE E

12. TYPE A

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.

13. TYPE B

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.

14. TYPE C

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.

15. TYPE D

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.

16. TYPE E

This technique is using EMI suppression techniques to make
a room into what is called Faraday cage

Although labor intensive to construct, the Faraday cage
essentially Blocks or greatly attenuates, virtually all
electromagnetic radiation from entering or leaving the cage or in this case a target room..

17. SK-6 ULTRA-THIN CELL PHONE JAMMER

SK-6 cell phone jammer is more and more popular used in
examination halls, examination rooms, test rooms, libraries
and so on. The cell phone jammer is the best instrument can
help examiners to prevent students cheating with cellular
phones in the examinations.

is the latest electronic product which transmits low power
radio signals to block the communication signal bandwidths in
GSM, CDMA, PHS, DCS, IDEN, UMTS, GPS, WiFi, Bluetooth
, etc.

18. FEATURES OF SK-6 CELL PHONE JAMMER








Show the working power on the shell with green lights
Prevent cheating by using cell phone in the examinations
Keeping you away from the noise or disturbance of
unexpected cell phone calls or SMS in the class time or
meeting time.
Mini-size medium power cell phone jammer
Low weight and Nice texture and color
To block wireless phone communication links within an
effective area.
No transmissions or receptions of cell phone call in coverage
area.
All specified frequency bands will be blocked simultaneously.

19. 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.
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.
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.
Corporations use jammers to stop corporate espionage by
blocking voice transmissions and photo transmissions from
camera phones.

20. CONCLUSION

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.

But it’s overall performance is very good and helpful in our life.

21. THANK YOU

23. QUERIES?????