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CDMA Cellular Phone Jammer Michael D. Kaprow Justin R. Antes Adam J. Pace EE413 – Communication Electronics Instructor: Pao-Lo Liu TA: Saurav K. Bandyopadhyay 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. EE 413 Communication Electronics Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserved Circuit Description EE 413 Communication Electronics Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve TL074 Quad Op Amp EE 413 Communication Electronics Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve Square Wave Generator Generates the signal that will be manipulated to control the VCO. EE 413 Communication Electronics Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve 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’ JAM TECH ® • Version 2005 • All Rights Reserve Buffer Buffer prevents the noise from interfering with the Square wave generator and Integrator. EE 413 Communication Electronics Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve 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 Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve 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’ JAM TECH ® • Version 2005 • All Rights Reserve 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’ JAM TECH ® • Version 2005 • All Rights Reserve Demonstration JAM TECH ® • Version 2005 • All Rights Reserve 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 Spring 05’ JAM TECH ® • Version 2005 • All Rights Reserve 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. JAM TECH ® • Version 2005 • All Rights Reserve 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. JAM TECH ® • Version 2005 • All Rights Reserve Questions JAM TECH ® • Version 2005 • All Rights Reserved