This document discusses the design and use of mobile phone jammers. It outlines key parameters for jammer design such as frequency bands, distance to be jammed, and jamming-to-signal ratio. It provides block diagrams of components including power supply, IF section, and RF section. Potential applications of jammers are also discussed, such as maintaining silence in libraries, lecture halls, and hospitals. Legal issues surrounding jammer use are addressed for different countries. Future technologies that could control phones without actively jamming signals are also mentioned.

1. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Mobile Jammer
By
Ranavasiya Mehul
10BIT047
Department of Computer Science
Ahmedabad
April 14, 2013

2. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Contents
1 Design Parameters/Specification of mobile jammer
2 Block Diagram of Mobile Jammer
3 Cell Phone Jammer Applications
4 Alternatives to Cell Phone Jamming
5 Ways to avoid a mobile phone jammer
6 Bibliography

3. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Design Parameters/ Specification of mobile jammer :
The frequency bands
Distance to be jammed (D)
Jammingto-signal ratio (J/S)
Power calculations
Free space loss

4. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Jamming-to-signal ratio (J/S)
Figure: J/S Ratio
Where:
Pj = jammer power
Pt = transmitter power
Gjr = antenna gain from jammer to receiver
Grj = antenna gain from receiver to Jammer
Gtr = antenna gain from transmitter to receiver
Grt = antenna gain from receiver to transmitter
Br = communications receiver bandwidth
Bj = jamming transmitter bandwidth
Rtr = range between communications transmitter and receiver
Rjt = range between jammer and communications receiver

5. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
FACTORS that affect both CELLULAR PHONE
RECEPTION and JAMMING:
Strength and location of the Cellular Base Station or Tower
Terrain and Topology
Weather and Climactic Conditions
Structures, Building Characteristic

6. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Block Diagram of Mobile Jammer:
Figure: Block Diagram

7. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Power Supply:
Figure: Power Supply

8. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
IF Section:
Figure: IF Section

9. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
RF Section:
Figure: RF Section

10. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Cell Phone Jammer Applications:
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.

11. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative

12. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Cell Phone Jamming Legal Issues:
Since these jammers actively broadcast radio signals, they may or
may not be legal to possess or operate based on the specific laws
of the area one is in.
United States: Cell phone blocking devices are used by federal
officials under certain circumstances.
Germany: illegal, but installation in jails has been proposed.
India: legal, Government, Religious Places, Prisons and
Educational Institutions use jammers.
Pakistan: It’s illegal to operate a jammer without the N.O.C.
from Ministry of Interior and Ministry of Telecom.

13. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
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.

14. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Ways to Avoid a Mobile Phone Jammer:
Try making calls through internet.
Download Skype on your mobile phone to make calls.
Walk away.

15. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative
Bibliography:
http://electronics.howstuffworks.com/cell-phone-jammer.htm
http://blog.jammer-store.com/2009/11/how-mobile-jammers-
work/
http://whatisacellphonejammer.com
http://en.wikipedia.org/wiki
http://www.phantom.co.il

16. Design Parameters/Specification of mobile jammer Block Diagram of Mobile Jammer Cell Phone Jammer Applications Alternative