MOBILE JAMMER is used to prevent mobile phones from receiving or transmitting signals with the base station

1. Presented by,
B. Rama
Software Engineer

2. CONTENTS
 What is MOBILE JAMMER?
 History
 Working of MOBILE JAMMER
 Techniques
 Applications
 Future scope
 Conclusion

3. What is MOBILE JAMMER?
• MOBILE JAMMER is used to prevent mobile phones from
receiving or transmitting signals with the base station .
• Mobile Jammer can be used in practically any location but are
used in places where a phone call would be particularly disruptive
like Temples,Hospitals,Libraries,Cinemahalls,Schools and
Colleges etc.

4. HISTORY:
MOBILE JAMMER were originally developed for law enforcement
and the military to interrupt communication by criminals and
terrorists.
Some were also designed to foil the use of certain remotely
detonated explosives .

5. Working of MOBILE JAMMER :
A Jamming device
transmits on the same radio
frequencies as the cellphone,
disrupting the communication
between the phone and
cellphone base station in the
tower.
It is called Denial of
Service Attack.

6. JAMMING TECHNIQUES:
1.Type “A” Device : JAMMERS
2.Type “B” Device : INTELLIGENT CELLULAR DISABLERS
3.Type “C” Device : INTELLIGENT BEACON DISABLERS
4.Type “D” Device : DIRECT RECEIVE AND TRANSMIT
JAMMERS
5.Type “E” Device : EMI SHIELD-PASSIVE JAMMING

7. Jamming Techniques
1. Type “A” Device: Jammers :-
This type of device comes equipped with several
independent oscilators transmitting ‘jamming signals’ capable of
blocking frequiencies used by paging devices as well as those used by
cellular systems control channels for call establishment.

8. Jamming Techniques
2. Type “B” Device: Intelligent Cellular Disablers :-
Unlike Jammers,type ‘B’ devices do not transmit and interfering
signal on the control channels.The device when located in a
designated ‘quiet’ area functions such as ‘detector’. It has a unique
identification number for communicating with the cellular base
station.

9. Jamming Techniques
3. 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 such as ‘Beacon’ and any
compatible terminal is instructed to disable its ringer or disable its
operation , while within the coverage area of beacon.

10. Jamming Techniques
4. Type “D” Device : Direct Receive And 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.

11. Jamming Techniques
5. Type “E” Device : EMI Shield-Passive Jamming :-
This technique is using EMI suppression technique 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 cage a target room.

12. APPLICATIONS
Jammers can be used in areas where transmissions are dangerous
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 .
For providing calm and peaceful atmosphere in hospitals.
To maintain the complete silence in library and lecture hall .
To avoid the fraud in examination hall .

13. Applications

14. FUTURE SCOPE
While the law clearly prohibits using a device to actively disrupt a
cell-phone signal , there are no rules against passive cell phone
blocking .
Companies are working on devices that control a cell phone but do
not “jam the signal” .

15. GOOD ASPECT

16. CONCLUSION
Every device is acts as good aspect as well as bad aspects .
Jamming is seen as property theft ,safety hazard .
But it’s overall performance is very good and helpful in our life .