group 10 final

8/9/2019 Group 10 Final

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CDMA CellularPhone Jammer

EE413 Communication Electronics

Instructor: Pao-Lo Liu

TA: Saurav K. Bandyopadhyay

Michael D. Kaprow

Justin R. Antes

Adam J. Pace

JAM TECH Version 2005 All Rights Reserved


2/17

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


3/17

Project Goals

To create a device that will disrupt cellularcommunication 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


4/17

Circuit Description



Spring 05


5/17

TL074 Quad Op Amp


Spring 05



6/17

Square Wave Generator

Generates the signal that will be manipulatedto control the VCO.


Spring 05



7/17

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.


Spring 05



8/17

BufferBuffer prevents the noise from interfering

with the Square wave generator andIntegrator.


Spring 05



9/17

Noise Generator-Operate a Zener diode in reverse

bias to create noise.

-Amplified with 2N3904 transistor

and the LM386 audio amplifier


Spring 05


-Noisy signal is what

overloads the

frequencies.


10/17

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.


Spring 05



11/17

Voltage Controlled Oscillator

(VCO)

- An oscillator designed so the output frequency can

be changed by applying a voltage to its control portor tuning port

- Crystek CVCO55BE- 1650-2050


12/17

Actual Circuit


Spring 05


VCO

Quad

OpAmp

LM386

Potentiometer


13/17

Demonstration



14/17


Spring 05


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


15/17

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 communicationcoming 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.



17/17

Questions


group 10 final

Documents