ABOUT WIRELESS TECH

1. Topic: Wireless communication
technology.

2. . Wireless communication involves the transmission
of information over a distance without help of
wires, cables or any other forms of electrical
conductors. The transmitted distance can be
anywhere between a few meters.

3.  Infrared (IR) wireless communication.
satellite communication.
broadcast radio communication system.
Microwave wireless communication.
Wi-Fi & Bluetooth.

4. Infrared band of the electromagnet corresponds to 430THz
to 300GHz and a wavelength of 980nm. The propagation of
light waves in this band can be used for a communication
system (for transmission and reception) of data. This
communication can be between two portable devices or
between a portable device and a fixed device.

5. A communication satellite is an artificial satellite used
specifically as a communication transmitter/receiver in orbit.
It behaves like a radio relay station above the earth to
receive, amplify, and redirect analog and digital signals
carried on a specific radio frequency.
US launched the first GEO satellite, Relay-1 in 1962.

7. Satellite communication

8. Basically an audio broadcasting service, radio broadcasts sound
through the air as radio waves. It uses a transmitter to transmit radio
waves to a receiving antenna. Radio broadcasting can also be done
via cable FM, the internet and satellites. A radio broadcast sends
data over long distances (across countries) at up to 2 megabits per
second (AM/FM Radio).

9. Microwave transmission involves the transfer of voice
and data through the atmosphere as super high-
frequency radio waves called microwaves. Microwave
transmission is mainly used to transmit messages
between ground-based stations and satellite
communications systems.

11. Wi-Fi: Wi-Fi is a popular
wireless networking
technology. Wi-Fi stands for
“wireless fidelity”. The Wi-
Fi was invented NCR
corporation/AT&T in
Netherlands in 1991. By
using this technology we
can exchange the
information between two or
more devices.

12. Bluetooth is a wireless technology
standard for exchanging data over
short distances (using short-
wavelength UHF radio waves)
between two device for personal
area network. Invented by telecom
vendor Ericsson in 1994.
For example mobile Bluetooth
headphone.

13. Television Remote Control – Modern televisions use wireless
remote control. Currently radio waves are also used.
Wi-Fi – This is a wireless local area network that establishes
internet connection with the portable computers.
Security systems – For homes and office buildings, hard wired
implementation security systems are replaced by the Wireless
technology.
Wireless energy transfer – A process where a power source
transmits electrical energy to electrical load which does not have
built-in power source wirelessly

16. When the wireless signals are transferred sometime signal
are blocked by the certain obstacles as walls, gates and
other material.
wireless technology does not provide the same bandwidth
guarantees as a wired connection

17. Flexibility: The internet can be accessed from anywhere
without any wire connection.
Easy to use: we can setup and connected device easily also
transfer data & information.
Any data or information can be transmitted faster and
with a high speed
Maintenance and installation is less cost for these
networks.
More user supported - cable device have limited slots
whereas wireless does not.

18. An unauthorized person can easily capture the wireless signals
which spread through the air.
Wi-Fi generates radiations which can harm the human health.
There are some limits to transfer the data, we cant able to
transfer the data for long distance.
Wi-Fi implementation is very expensive when compared to the
wired connection.

19. Contents
 Introduction
 Types of Jammer
 How Jammer Works
 What inside Jammer
 Applications of Jammer
 Future scope of Jamming Technology
 Cell Phone Detector Introduction
 Block Diagram
 Application
 Conclusion
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20. Introduction
 Cell phone jammers are devices that create a
temporary "dead zone" to all cell
phone traffic in their immediate proximity.
 A jamming device transmits - same radio frequencies
of greater power as the
cell phone, disrupting the communication between
the phone and the cell-
phone base station in the tower.
 It's a called a denial-of-service attack.
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21. Introduction ( Continued . . )
 Disrupting a cell phone is the same as jamming any
other type of radio
communication.
 A cell phone works by communicating with the
service network through a cell
tower as base station.
 Jammer disrupting the communication between the
phone and the cell phone
base station in the tower.8/12/2016 21

22. Jamming Device
 Jamming devices overpower the cell phone by
transmitting a signal on the
same frequency.
 Power of the signal should be high enough so that the
two signals collide and
cancel each other out.
 The phone is tricked into thinking there is no service
because it can receive
only one of the frequencies.8/12/2016 22

23. Jamming Device ( Continued . . )
 Less complex devices block only one group of
frequencies, Some of the high-
end devices block all frequencies at once.
 Low-powered jammers block calls in a range of about
30 feet (9 m).
 Higher - powered units - as large as a football field.
 Law enforcement jammer units - up to 1 mile
(1.6 km) from the device.
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24. Components of Jamming Device
 The simplest just have an on/off switch and a light
that indicates it's on.
 Complex devices have switches to activate jamming at
different frequencies.
 Main Components :
 Power Supply
 Circuitry
 Antenna
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25. Components ( Continued . . )
 Circuitry
 The main electronic components of a jammer are:
 Voltage-controlled oscillator
 Tuning circuit
 Noise generator
 RF amplification
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26. Block Diagram
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If section Rf section
Jamming
signals
Power supply

27. How Jammers Work ?
 Jammers work in a similar way to radio jammers by sending
out the
same radio frequencies that cell phones operate on.
 This creates enough interference so that a call cannot connect
with a device.
 2 types of jammers. The first type are usually smaller devices
that block the
signals coming from towers to individual.
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28. How Jammers Work ? ( Continued
. . )
 Can block signals within about a 30-foot radius. Cell
phones within this range
simply show no signal.
 The second type of cell phone jammer is usually
much larger in size and more
powerful.
 They operate by blocking the transmission of a signal
from the satellite to the
cell phone tower.
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29. How Jammers Work ? ( Continued
. . )
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30. Types of jammer device
 Cell Phone Jammer
 Portable Jammer
 Remote Control Jammer
 Adjustable Cell Phone Jammer
 School & Prison Phone Jammer
 Explosion - Proof Jammer
 Police & Military Jammer for victim’s security
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31. Application
of Jammers in Edu systems
 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
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32. Applications
 Cell-phone alerter (detector) is useful that
indicate the presence of a cell-phone signal. These
can be used in hospitals where cell-phone signals
could interfere with sensitive medical equipment.
When a signal is detected, users are asked to turn
off their phones or Jamming can be used.
 It is useful airport.
 It is useful wherever cell phone can disturb.
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33. 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.
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34. Conclusion
 We can say every device is acts as good aspects as well
as bad aspects.
 Operating or even owning a cell phone jammer is
illegal in most municipalities
and specifically so in the United States.
 Jamming is seen as Property Theft, Safety Hazard.
 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
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35. The Presentations are best to our
efforts

36. 8/12/2016 36