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[Discuss-gnuradio] ISO14443 rfid receiver

From: Sebastian Herzberg
Subject: [Discuss-gnuradio] ISO14443 rfid receiver
Date: Sat, 30 Mar 2013 17:58:38 +0100


I'm trying to receive a signal from a ISO14443 compliant rfid tag. I have a USRP N210 + gnuradio running and I issue
commands (just the anticollision loop) via a ACS ACR122U reader to a faked german ID card (fake like "offical fake by Bundesdruckerei").

As I'm a computer scientist and not that much into signal processing I googled around and found: http://web.mit.edu/zacka/www/mbta.html
About half way down the page I saw their toolchain and tried to implement a receiver at 12.71 MHz for one of the subcarriers.

Within the spectrum I can see that there is a signal but after demodulation I can not see a thing in the scope plot.

Would someone be able to share a simple receiver with me so that I can learn from that? I would really appreciate that.

Best regards

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