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Old 29-10-2009, 02:20 PM   #24
oneup
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Quote:
Originally Posted by snapdragon View Post
c) They can be remotely read only when energised (powered up) by a changing magnetic field in a suitable frequency range.
That's passive RFID, which is quite old. The new RFID technology, where everyone is talking about, is active RFID. It contains it's own battery and constantly transmits it's signal every 1.5 seconds.
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