So at the moment this flowgraph is all I got: http://dl.dropbox.com/u/826839/ask_demod.py If I tune to 13.56 MHz I can see the carrier but how can I manage to see the ASK signal in the scope?
2013/3/30 Sebastian Herzberg <sebastian.herzberg+gnura...@gmail.com> > Hi, > > 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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