Transcript CDMA Cellular Phone Jammer (TA: Saurav K. Bandyopadhyay)

CDMA Cellular
Phone Jammer
Michael D. Kaprow
Justin R. Antes
Adam J. Pace
EE413 – Communication Electronics
Instructor: Pao-Lo Liu
TA: Saurav K. Bandyopadhyay
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Presentation Outline
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Goals of Project
Description and Analysis of Circuit
Demonstration of Circuit
Accomplishments
Questions
EE 413 Communication Electronics
Spring 05’
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Project Goals
• To create a device that will disrupt cellular
communication with respect to the following:
- Operate in the 1900 MHz band.
- Disallow any communication of phones
that use that band. (Denial of Service)
- Have a two meter effective blocking
radius.
EE 413 Communication Electronics
Spring 05’
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Circuit Description
EE 413 Communication Electronics
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TL074 Quad Op Amp
EE 413 Communication Electronics
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Square Wave Generator
Generates the signal that will be manipulated
to control the VCO.
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Spring 05’
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Integrator
-The Integrator takes the square wave and
transforms it into triangular wave.
- This triangular wave is what allows the VCO to
sweep the band of CDMA frequencies.
EE 413 Communication Electronics
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Buffer
Buffer prevents the noise from interfering
with the Square wave generator and
Integrator.
EE 413 Communication Electronics
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Noise Generator
-Operate a Zener diode in reverse
bias to create noise.
-Amplified with 2N3904 transistor
and the LM386 audio amplifier
-Noisy signal is what
overloads the
frequencies.
EE 413 Communication Electronics
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Mixer
-The mixer is where the triangular wave and the nose
get mixed.
-The tuning circuit adjusts amplitude of wave and
amount of noise being coupled to signal.
EE 413 Communication Electronics
Spring 05’
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Voltage Controlled Oscillator
(VCO)
- An oscillator designed so the output frequency can
be changed by applying a voltage to its control port
or tuning port
- Crystek CVCO55BE- 1650-2050
Actual Circuit
VCO
LM386
Quad
OpAmp
Potentiometer
EE 413 Communication Electronics
Spring 05’
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Demonstration
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Weeks
1
2
1.0 Research and Development
1.1 research technology
1.2 Develop circuit diagram
1.3 Select and order Componets
2.0 Construct Project
2.1 Build Circuit
2.2 Evaluate Circuit
2.3 Debug Circuit
3.0 Prototype Design + Evaluate
3.1Test Final Build
3.2 Demo
EE
Communication Electronics
3.3413
Documentation
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3
4
5
6
7
8
9
Possible Improvements
• We can add another VCO to block
the 800MHz digital roam feature
on some phones. (Verizon comes
standard)
• We can also add amplifiers that can
boost the area that is affected.
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Accomplishments
• We were able to block communication
coming into and going out from a CDMA
phone operating on the 1900MHz
frequency band.
• We were able to reach the 2 meter
blocking radius.
• We were able to keep the cost under 50
dollars.
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Questions
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