wrote in message
...
On Thu, 10 Mar 2011 19:36:46 -0000
"tim...." wrote:
wrote in message
...
On Thu, 10 Mar 2011 17:00:36 -0000
"tim...." wrote:
Given a powerful enough directed RF signal you could certainly power
up
and
send signals to an Oyster card from a distance.

Only of you wanted to fry the human holding it, at the same time

Why? It shouldn't need much more power than you'd get from those shop
security gates.

The security tags have an internal power source.

You sure about that?

No. I just did a google and that is what I discovered

(OTOH I do know how RFID works without googling!)

tim