You know, this thing can defeat EAS systems in stores. Build one, jam the right frequency, and you'll get all the stuff you can conceal. Plenty of stores rely on the EAS system.
I'm not advocating or condoning such actions (as it makes it more expensive for me, as a consumer), but knowledge is power.
Taken from a Wikipedia page:
"Like most systems that rely on transmission of electromagnetic signals through a hostile medium, EAS sensors can be rendered inoperative by jamming. As the signals from tags are very low-power (their cross-section is small, and the exits are wide), jamming requires little power. Evidently, shoplifters will not feel the need to follow radio transmission regulations, hence crude, easy-to-build transmitters will be adequate for them. An amateur can therefore design and build a jammer for magnetic, magneto-acoustic or radio-frequency systems without special equipment. For instance, a square wave near 58 kHz driving a coil with less than a watt of power will jam magneto-acoustic systems. As for 8.2 MHz radio-frequency systems, since they are sweeping their frequency, building a jammer for them does not require a precise transmission frequency and therefore neither does it require expensive frequency counting equipment, However, due to their high frequency of operation, building a jammer can be difficult for microwave circuits; these systems are therefore less likely to be jammed. Although jamming is easy to perform, it is also easy to detect. A simple firmware upgrade should be adequate for modern DSP-based EAS systems to detect jamming. However, these systems can usually be circumvented by simpler means (shielding, detaching or deactivation). Hence, the incentive for building jammers is low. It is not publicly known whether any jamming counter-measures have been implemented."
But hey, don't shoplift. Theft is one of the main reasons corporations are moving towards RFID tags. RFID inventory tracking is bad for all of us. Don't help it expand.
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You know, this thing can defeat EAS systems in stores. Build one, jam the right frequency, and you'll get all the stuff you can conceal. Plenty of stores rely on the EAS system.
I'm not advocating or condoning such actions (as it makes it more expensive for me, as a consumer), but knowledge is power.
Taken from a Wikipedia page:
"Like most systems that rely on transmission of electromagnetic signals through a hostile medium, EAS sensors can be rendered inoperative by jamming. As the signals from tags are very low-power (their cross-section is small, and the exits are wide), jamming requires little power. Evidently, shoplifters will not feel the need to follow radio transmission regulations, hence crude, easy-to-build transmitters will be adequate for them. An amateur can therefore design and build a jammer for magnetic, magneto-acoustic or radio-frequency systems without special equipment. For instance, a square wave near 58 kHz driving a coil with less than a watt of power will jam magneto-acoustic systems. As for 8.2 MHz radio-frequency systems, since they are sweeping their frequency, building a jammer for them does not require a precise transmission frequency and therefore neither does it require expensive frequency counting equipment, However, due to their high frequency of operation, building a jammer can be difficult for microwave circuits; these systems are therefore less likely to be jammed. Although jamming is easy to perform, it is also easy to detect. A simple firmware upgrade should be adequate for modern DSP-based EAS systems to detect jamming. However, these systems can usually be circumvented by simpler means (shielding, detaching or deactivation). Hence, the incentive for building jammers is low. It is not publicly known whether any jamming counter-measures have been implemented."
But hey, don't shoplift. Theft is one of the main reasons corporations are moving towards RFID tags. RFID inventory tracking is bad for all of us. Don't help it expand.