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4 February 2007
http://augustans.blogspot.com/2007/02/dont-look-here.html
Atkinson used to work for the NSA and, he says, “other organizations I don’t talk about.” Now, as the president and senior engineer of Granite Island Group, a Massachusetts-based security consulting firm, he’s still immersed in the world of intelligence, counterintelligence and, one can presume, counter-anti-counterintelligence.
James Atkinson (http://www.tscm.com/) writes:
Amazingly easy to fake out these little devices and make the monitor think someone is 75 feet away from the monitor when they are actually 200 miles away. By the same token a person who is under house arrest and who has always kept within 75 feet of the device can be made to appear to be out of range (which could create havoc) or that they have not tampered/removed the device when in fact they have.
The operational frequency is 314.2 MHz, data is burst for 7 mSec once every 15-30 seconds which makes it extremely easy to detect one of these on somebody from quite a distance away.
Neighbors of the person on house arrest or victims or the person wearing one of these can even program their scanners to listen for the data burst of someone who ought not be where they are, or so that members of the public can ensure that the person under house arrest is actually where he is supposed to be.
Persons interested in scanning the local folks under house arrest need only set there scanners to 314.2 MHz, and program the mode or modulation to AM or wide AM (wide AM, 150-300 kHz bandwidth is best). Then listen for something to buzz at least once every 30 seconds, and, viola, you are listening in to one of these tags. It is then a simple matter of adjusting the radio as the tag may be off frequency slightly, but you're not going to have to search more then a few dozen kilo-hertz either side of the given frequency.
If you pick up one of these signals and want to know where the tag is you can use a small hand-held antenna to direction find the person wearing the tag.
https://svartifoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=298915native_or_pdf=pdf
https://svartifoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=298913native_or_pdf=pdf
Amusingly enough, you can fake the signal from one of these with the remote to an off-the-shelf car alarm (with a few minor modifications). Since the frequency being used is smack in the middle of the UHF military aero band the signal can also be monitored with the such equipment, but take care not to transmit a signal on the 314.2 MHz frequency as someone may be led to believe the detainee is tampering with the device, or that they have wandered out of range >:-}
-jma
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