Group 10 presentation - case study 6.1 final-copy_ Justin Estrada&Claire Gillespie
Group 10 Final
Transcript of 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
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Presentation Outline
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 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.
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EE 413 Communication Electronics
Spring 05
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Circuit Description
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EE 413 Communication Electronics
Spring 05
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TL074 Quad Op Amp
EE 413 Communication Electronics
Spring 05
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Square Wave Generator
Generates the signal that will be manipulatedto control the VCO.
EE 413 Communication Electronics
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
Spring 05
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BufferBuffer prevents the noise from interfering
with the Square wave generator andIntegrator.
EE 413 Communication Electronics
Spring 05
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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.
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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 portor tuning port
- Crystek CVCO55BE- 1650-2050
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Actual Circuit
EE 413 Communication Electronics
Spring 05
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VCO
Quad
OpAmp
LM386
Potentiometer
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Demonstration
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EE 413 Communication Electronics
Spring 05
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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
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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.
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Questions
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