RFID chips...........

[ainitfunny]

For all of you that want to know the latest poop on RFID tags just google "RFID SUPPLIERS" , click on some of the links and read what they are advertising for sale, how big it is and how far away it can be read.

Nothing like going to the horse's mouth for your information rather than ignorant speculation.

ALSO HERE IS A LINK TO DOD RFID REQUIREMENTS for people who sell stuff to DOD , which WILL greatly enlarge your knowledge about the subject. (I learned that RFID tags on ammo, fuel or explosived have to be SPECIALLY CERTIFIED TO NOT BE HAZARDOUS)
http://www.acq.osd.mil/log/rfid/Eve...mation Guide-v6.0.pdf#search='rfid suppliers'

 

[Big Whip]

http://www.epcglobalinc.org/consumer/

 

[Guardian Angel]

Look, the effective range of these tags is about 5 feet. If you have a POWERED tag with a built-in transmitter, then you can have a longer range, but I doubt that in any case it would be greater than about 200'. The powered units would be much larger (since they need a battery), and you'd be able to easily identify them.

Unless Guardian Angel can cite a reliable source for his/her information, I have to discount it. As an Electronic Engineer myself, I have some slight idea as to how these things work.

Sorry for taking so long to reply.

It is easy to generate a large enough electro pulse to charge the power source in an RFID chip from a long distance. It only takes microwatts of power sent at the right resonant frequency.

Any signal can be detected from a long distance even at nanowatts of RF emmision. The trouble with most electronic receivers is the signal to noise ratio. By using super cooled RF filters amazing descrimination can be achieved.

Consider a small handheld walkie talkie that can be used up to 2miles line of sight. Now reduce the transmitter power and increase the receiver and shorten the needed distance, there you have it.

GA