Selon Eric Blossom :
> On Wed, Mar 18, 2009 at 10:04:27AM -0400, Marco Bottino wrote:
> > Hello,
> >
> > I was doing some test with a 6Volts battery with the USRP in order to be
> > able to use my USRP outdoors.
> > (Sonnenschein A506/4.2 s http://www.sonnenschein
Hello,
I was doing some test with a 6Volts battery with the USRP in order to be
able to use my USRP outdoors.
(Sonnenschein A506/4.2 s http://www.sonnenschein.org/A500.htm)
Everything was fine when I unintentionally inverted the polarity of the
battery.
At the moment, connecting the power converte
Hello All,
I'm trying to do more or less the same thing as Kevin but with two other
readers (a RFIdeas Playback and an OpenPCD) and other kind of cards (HID
IClass 2K and Mifare Classic 1K: both working at 13.56MHz).
I got an interesting signal just putting my loop antenna attached both
to the card
Hello all!
I wrote a script in python that takes a binary file (output of the
usrp_rx_cfile.py), convert it in a sequence of complex values and applies a
variable threshold in order to convert that complex sequence in a square wave.
The complex sequence already represent a square wave, but with
Hello everybody,
I'm sorry to post once again a question about the dimension and the format of
the samples output by the USRP, but it is actually hard for me to understand.
I'm using the USRP Motherboard with a LFRX daughterboard.
Question: if the ADC has 12 bits, each sample that arrives from
Hello,
Selon Paul Mathews <[EMAIL PROTECTED]>:
> You have to choose reasonable values for the decimations and filter
> parameters. The attached file runs without generating compiler errors, but
> it's up to you to take it from here.
> Paul
>
If, as you say, it runs, what does "RuntimeError: comp
Hello,
thank you very much for answering me.
Selon Paul Mathews <[EMAIL PROTECTED]>:
> > I know very little about RFID, but I can make these observations on
>
> > how I would probably perform a naive demodulation of this signal.
>
> > 1. Tune the USRP to your carrier frequency and bring your s
gt; carried by the phase. I still trying.
I'm sorry for my ignorance but which is the information carried by the phase?
With "demodulation" what do you exactly mean? USRP isn't able to sample
directly at the RFID's frequency?
Finally, reading the ISO standards it seems that
hello everybody,
I am using the USRP with LFRX daughterboard to catch an RFID signal ASK
modulated (frequency 13.56MHz, decimation factor 16).
I really need an help because I don't understand very well the meaning of the
outputs of my USRP: if the information related to the ASK is only the
ampli
Hello,
I am a student and I am doing my thesis project on the RFID protocols.
At the present time, with the USRP, I am trying to catch the signal between a
reader and a tag RFID.
As reader I am using an OpendPCD (using the firmware for the Mifare Classic
protocol) and as card a Mifare Classic Card.
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