CDMA Cellular Phone Jammer EE413 – Communication Electronics Instructor: Pao-Lo Liu TA: Saurav K. Bandyopadhyay Michael D. Kaprow Justin R. Antes Adam.

CDMA Cellular Phone Jammer

EE413 – Communication Electronics Instructor: Pao-Lo Liu TA: Saurav K. Bandyopadhyay

Michael D. KaprowJustin R. AntesAdam J. Pace

JAM TECH ® • Version 2005 • All Rights Reserved

Presentation Outline

• Goals of Project • Description and Analysis of Circuit• Demonstration of Circuit• Accomplishments• Questions

EE 413 Communication Electronics

Spring 05’

JAM TECH ® • Version 2005 • All Rights Reserve

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.



Spring 05’

Circuit Description



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TL074 Quad Op Amp


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Square Wave GeneratorGenerates the signal that will be manipulated to control the VCO.


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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.


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BufferBuffer prevents the noise from interfering with the Square wave generator and Integrator.


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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


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-Noisy signal is what overloads the frequencies.

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.


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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


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VCO

Quad OpAmp

LM386

Potentiometer

Demonstration



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Weeks 1 2 3 4 5 6 7 8 9

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

3.3 Documentation

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.


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.


Questions


CDMA Cellular Phone Jammer EE413 – Communication Electronics Instructor: Pao-Lo Liu TA: Saurav K. Bandyopadhyay Michael D. Kaprow Justin R. Antes Adam.

Documents

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rights reserve ee

demonstration jam tech

pace jam tech version

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documentation slide