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The intentional disabling of these chips can cause supply chain
The best method is to HERF (high energy radio frequency, usually
microwaves) the chips using a small transmitter (read about high
power home made microwave weapons for herfing). The German branch
(privacy activists) of the global guerrilla innovation network has
developed a simple solution that converts a standard film camera
into a short range RFID zapper. This system:
"...copies the microwave-oven-method, but in a much smaller scale.
It generates a strong electromagnetic field with a coil, which
should be placed as near to the target-RFID-Tag as possible. The
RFID-Tag then will recive a strong shock of energy comparable with
an EMP and some part of it will blow, most likely the capacitator,
thus deactivating the chip forever.
To keep the costs of the RFID-Zapper as low as possible, we decided
to modify the electric component of a singe-use-camera with flashlight,
as can be found almost everywhere. The coil is made from varnished
wire and placed inside the camera exactly where the film has been.
Then the coil is soldered between the cameras electronic and its
Last but not least most single-use-cameras will require some kind
of switch to be build into them, since their activating-mechanism
usually is to small and primitive. Once the switch is connected and
tested, the camera can be closed again and henceforth will serve
as a RFID-Zapper, destroying RFID-Tags with the power of ordinary
The RFID Zapper is a device for destroying rfid tags without having to touch them and without leaving any obvious marks on the tag itself, it works by generating a large EM Burst which the RFID tags antenna picks up and funnels into the tag which destroys it. its the same as if you were to plug an led into a wall socket.
(clicking on any of the images below will take you to a directory with larger images of the same object)
The RFID Zapper is very easy to build, all you need is a disposable camera a soldering iron and some magnet wire. The final apparatus is simply a coil of magnet wire soldered into the camera flash circuit where the flash bulb used to be
Finishing and testing
To finish it off I enclosed the entire thing in a basic project box from radio shack with a nice big red button to activate it. So far it has been successful at wiping out credit cards as well as RFID devices, below are pictures of the final device in its project box and pictures of the final device with an audio pickup attached, below the pictures is an embedded sound file which plays the audio version of the EM Pulse the device gives off (cool).
What's Inside a Cell Phone Jammer
RF jammers are fairly simplistic devices. The most simple jammers have only an on/off switch and an LED signifying power to the unit. The more complex devices contain switches or dials that allow the user to select the frequencies desired for jamming. The components which can be located in every jammer include:
Antenna -- The antenna transmits the jammers interrupting signal. Certain jammers contain an internal antenna while others have external antennas which give the user a longer range to broadcast the signal and more control over frequency tuning.
Voltage-controlled oscillator -- The oscillator is responsible for generating the competing radio signal.
Tuning circuit -- In those units the enable user-specified frequency tuning, the tuning circuit controls the broadcast frequency of the circuit by sending a specific voltage to the oscillator.
Noise generator -- The noise generator, which is part of the tuning circuit, actually creates radomized electric output within a specific frequency range which is used to disrupt a cellular network signal.
RF amplification (gain stage) -- This amplifier controls the level of power to the tuning circuit. It is responsible for boosting the power as necessary to jam signals.
Power Supply -- Smaller jamming devices may use batteries while larger and more power-intensive devices can be plugged into a standard outlet or connected through the electrical system of a vehicle.
The JAMPACK is a lightweight, battery-powered, portable, high-power multi-band jammer, built into a sturdy back-pack. The JAMPACK was designed for the protection of ground troops and bomb disposal squads against the threat of remotely controlled improvised explosive devices (RCIEDs).
Despite its small form factor, The JAMPACK jams the most used cellular, satellite and VHF/UHF frequencies, almost entirely eliminating the possibility of an enemy detonating an RCIED in proximity to the protected troops.
Designed from the ground up for protecting troops on the move, the JAMPACK was engineered to operate reliably in any climate and terrain. Its high-capacity Mil Spec rechargeable batteries provide extended periods of field operation.
From Wikipedia, the free encyclopedia
A voltage-controlled oscillator or VCO is an electronic oscillator designed to be controlled in oscillation frequency by a voltage input. The frequency of oscillation is varied by the applied DC voltage, while modulating signals may also be fed into the VCO to cause frequency modulation (FM) or phase modulation (PM); a VCO with digital pulse output may similarly have its repetition rate (FSK, PSK) or pulse width modulated (PWM).
Dynamic antenna tuning circuit for a radio frequency identification reader
USPTO Application #: 20090206999
Title: Dynamic antenna tuning circuit for a radio frequency identification reader
Abstract: A resonant antenna circuit for a radio frequency identification (RFID) reader generates an electrical signal for activating a passive identification tag. The identification tag in turn generates a coded electrical signal that is detected by the reader. The electrical characteristics of the resonant circuit are actively and dynamically altered so that the antenna performs more optimally during the transmit and receive intervals. (end of abstract)
Radio antenna tuning circuit United States Patent 5263183
The present invention provides an antenna or preselector tuning method and circuit that tunes an antenna or preselector in a very short period of time. The circuit of the present invention does not rely on measuring the magnitude of the signal strength at the output of the receiver as do many prior art antenna tuning techniques. With the present invention a radio frequency (RF) oscillator set to the desired receiver frequency generates an excitation signal which is lightly coupled to the antenna tuned circuit through a network. A phase detector then compares the phase of signal established in the antenna tuned circuit with the phase of the excitation signal to produce an "error" signal indicative of the phase shift of the excitation signal as it passes through the network. Using this "error" signal and locked loop (PLL) techniques, an antenna tuning voltage is created that results in a zero phase shift through the network.