Seminar.

2. CONTENTS
Introduction
Components of mobile jammers
Mobile Jamming Techniques
Design parameters/ specification of mobile jammer
Block diagram of mobile jammer
Applications
Future scope of Jamming Technology
Conclusion

3. INTRODUCTION
A
mobile jammer is an instrument which is used to prevent mobile
phones from receiving signals from the base stations.
Which can be used in practically at any location, but are mostly found
in places where a phone call would be particularly disruptive because
silence is expected.
Disrupting a cell phone is the same as jamming any other type of radio
communication.

4. COMPONENTS OF MOBILE JAMMER
COMPONENTS OF A MOBILE JAMMER
INCLUDE:
 Voltage Controlled Oscillator
 Tuning Circuit
 Noise Source
 RF Amplification Unit
 Transmitting Antenna
Voltage Controlled Oscillator
• VCO is like heart of our jammer.
• VCO produces RF signal which will interact
with the blocked device.
• We must select frequencies
which Will be used in our
Signal blocking device.

5. Tuning circuit
Noise generator
 Tuning circuit can be of two types:
o Open-loop
o Feedback
 Open-loop is a saw tooth-wave generator
 Noise
which makes VCO to go from lowest to
highest frequency.
 The feedback is using PLL to adjust the
VCOs frequency constantly.
generator produces random electronic
output in a specified frequency range to jam
the cell-phone network signal (part of the
tuning circuit).
Cell Phone
Jammer

6. RF amplification unit
Transmitting antenna
• RF amplification unit is to increase the area
• Transmitting Antenna is a tool which
covered by our jammer along with its signal
blocking power.
•
The more power has our signal blocker, the
bigger radius it jams.
transmits signals produced by your jammer.
• The main characteristic of antenna is VSWR
(voltage standing wave ratio).

7. MOBILE JAMMING TECHNIQUES
• There are various types of jamming devices
available which are using different jamming
techniques.
 Type "A" device
 Type "B" device
 Type "C" device
 Type "D" device
 Type "E" device
Type "A" device
• Type "A" devices are simple jammer.
• 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.

8. Type "B" device
Type "C" device
• Type
• Type
• Unlike
•
•
•
"B" devices are also known as
INTELLIGENT CELLULAR DISABLERS.
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.
"C" devices are also known as
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 as a beacon and any
compatible terminal is instructed to disable
its ringer or disable its operation, while with
in the coverage area of beacon.

9. Type "D" device
Type "E" device
• Type
• Type "E" devices are used for EMI Shield -
"D" devices are DIRECT RECEIVE
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.
Passive Jamming.
•
This technique is using EMI suppression
techniques to make a room into what is called
faraday cage.

10. DESIGN PARAMETERS/ SPECIFICATION
OF MOBILE JAMMER
• The frequency bands
• Distance to be jammed (D)
Free space loss {F}= path loss (db)= 32.44 + 20 log d(km) + 20log f(mhz)
• Power calculations

11. BLOCK DIAGRAM OF MOBILE JAMMER
BLOCK DIAGRAM OF MOBILE JAMMER
Power Supply

12. IF Section
RF Section

13. APPLICATIONS
• There are various types of jamming devices available which are using different jamming techniques.
• To maintain the complete silence in library and lecture hall.
• To avoid fraud in examination 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 hospitals.
• Church/mosques/cathedral/temple/religious establishment.

14. FUTURE SCOPE OF JAMMING TECHNOLOGY
• 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. CONCLUSION
• At last we can say 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 .
• For this we can take a example that if at any place cell phone jammer is on than anybody wants
to use than there creates some problems.
• But its overall performance is very good and helpful in our life.

16. REFERENCES
• "Zone
of silence [cell phone jammer]," spectrum, IEEE , vol.42, no.5,
18, may 2005
• www.Howstuffworks.com
• Wikipedia.Org/wiki/mobilephonejammer/
• Mobile personal communications committee
of the radio advisory board of
Canada, use of jammer and disabler devices for blocking PCS, cellular related
services
• Http://whatisacellphonejammer.com
• Http://blog.Jammer-store.Com/2009/11/how-mobile-jammers-work

17. THANK YOU