Contactless bank cards

Roland Perry lists at
Thu Nov 18 08:18:37 GMT 2010

In article 
<AANLkTinN1_26-O+ATrbwoKkS1jfZbfAqockcD8gGoAWX at>, 
Cybergibbons <cybergibbons at> writes
>It's perfectly possible to relay RFID communications over a distance.
>It's easy to demonstrate this using two RFID readers with PN53x chips
>in them - one reads the card, the other emulates it.
>If you use USB, the latency and unpredictability causes issues with
>some card readers - this doesn't work to relay to TFL readers for
>example. However, you can use any microprocessor to perform the relay

I don't really understand what you mean by "any microprocessor"

>to avoid this, and use an RF link instead of wires.

An RF link with more bandwidth than USB, presumably? Or is it just "less 
latency per packet"?
Roland Perry

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