yeah. The 900 MHz 3W can pick you up (credit card size RFID passive tag) at
over 10 ft.
Most of the anti theft devices are either magnetostrictive (called acoustic)
or magnetically switched on/off. They are inexpensive and do not carry any
identification.
On Saturday 27 March 2004 06:06, you wrote:
> LinuxLingam wrote:
> > RFID tags can be used to track anything and everything, for "your
> > care,
> > comfort, and safety".
>
> Rght.
>
> > yeah, right.
>
> Ooops, you were being sarcastic ;-)
>
> > people are setting of RFID sensors ('you stole something') at shopping
> > malls and elsewhere, because even their US$20 currency notes and Euro
> > currency notes contain RFID tags for 'tracking.'
>
> I work with RFID, my employer uses this (we are a distribution company).
> Being in Singapore, my car is "RFID-tagged" for toll charge purposes.
>
> What the writer of the article below describes would require me to stretch
> my knowledge of the technology too far. Why would the tag in the bill
> respond to the probe for Gilette razors?
>
> == QUOTE ==
>
> > http://www.prisonplanet.com/022904rfidtagsexplode.html
>
> Want to share an event with you, that we experienced this evening.. Dave
> had over $1000 dollars in his back pocket (in his wallet). New twenties
> were the lion share of the bills in his wallet. We walked into a truck
> stop/travel plaza and they have those new electronic monitors that are
> supposed to say if you are stealing something. But through every monitor,
> Dave set it off. He did not have anything to purchase in his hands or
> pockets. After numerous times of setting off these monitors, a person
> approached Dave with a 'wand' to swipe why he was setting off the monitors.
>
> Believe it or not, it was his 'wallet'. That is according to the minimum
> wage employees working at the truck stop! We then walked across the street
> to a store and purchased aluminum foil. We then wrapped our cash in foil
> and went thru the same monitors. No monitor went off.
>
> == END QUOTE ==
>
> This does not sound like RFID at all. This sounds like the RF sensors,
> normally placed to prevent pilferage (or mistaken under-payment, politely).
> That system uses sensors which detect presence of transponder, not ID of
> transponder. That is why the door through which you leave can be 3 feet
> wide. For RFID, (the "ID" is important), to set of on a transponder the
> size of Mr Jackson's eye, I would need under 4cm distance, at current power
> levels. That means you would have to roll over the sensor to ensure that
> you were not stealing anything; you figure out the rest.
>
> LL, you know I mistrust Govt much more than you do, but I trust technology.
> The report you quote has factual errors, which is OK, but even worse, its
> language is designed to inflame, not discuss.
>
> Could RFID be used to identify notes? Yes. Track? Yes, but difficult (you
> would need to be handling the note, or pass it through a scanner). Wands
> would not do.
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