Re: RFID using LFTX/LFRX (Was [Discuss-gnuradio] GNU Radio mention inDEFCON subway presentation)

[ChoJin]

On Sep 7, 2008, at 6:40 PM, Eric Blossom wrote:

> On Sun, Sep 07, 2008 at 10:16:04AM -0400, Philip M. Lanese wrote:
> > ChoJin,
> >
> > Commercial 13.56 MHz RFID systems don't normally use a receiver in  
> > the
> > traditional sense to recover the tag data.

[...]

> Here's a link to the "Open RFID reader":
>
>  http://www.openpcd.org/
>
> See also
>
>  http://www.openpcd.org/rfiddump.0.html
>
>
> It's been used with GNU Radio...

Thank you to both of you for the extra information.

I was aware of the openpcd project, but as an exercise I was trying to  
code a
reader using the usrp and the LF daughterboards alone without any extra
electronic parts.

That's why, although it is not done like that in the real world, I'm  
using the
LFTX to emit the signal and using the LFRX to try to read it back  
after being
modulated slightly by the tag.

Do you think it won't be possible to do so (i.e. just plugging a loop  
of copper
wire into the antenna slots of the daughterboards) without using an op- 
amp
stage first?

--
Best Regards,
ChoJin