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Hello.
I have strange cards I found in France. I tried to put them in the field of my LF and HF antennas but the voltage drop (HF) is very low (-0.5V).
I suspect these cards to be in the 3.25 Mhz frequency, and I would test it by building a new antenna for my Proxmark.
Is it possible ? I guess I have to rewrite some parts of the firmware if I want to do that, or is it just impossible ?
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How do you know it's working frequency? Did you perform frequency measurement with oscilloscope? Maybe it would be easier to buy reader that supports your tag?
Also look at this:
http://www.proxmark.org/forum/viewtopic.php?id=123
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