Re: [Discuss-gnuradio] USRP2 + WBX

[Jason Abele]

On Thu, May 06, 2010 at 06:12:33PM -0500, Evan Chen wrote:
> Hello everyone,
> 
> I just got the USRP2+WBX recently. And I used the famous "usrp2_fft.py" as a
> starting point.
> 
> The problem I met is that the curve plotted by the usrp2_fft.py seemed to be
> abnormal. Sometimes, the amplitude of the curve was around -150 dB, and
> sometimes it went below -400 dB.
> 
> An antenna was attached to the "TX/RX" port of the WBX.
> 
> I tried "usrp2_probe" and got the following information.
> 
> 
> >>> USRP2 Probe
> 
> MAC Addr:
>     00:50:c2:85
> 
> Name (ID):
>     1
> 
> Converter Rate:
>     100000000 Hz
> 
> Gain Range (min, max, step size):
>     0.0
>     0.0
>     0.0
> 
> Freq Range (min, max):
>     -90000000000.0 Hz
>     90000000000.0 Hz
> 
> 
> It looks like to me the RF daughterboard was not properly configured.
> 
> Did anyone meet such a problem?
> 
> Also, I have another two questions:
> 
> For full-duplex communications, does it mean both "TX/RX" and "RX2" need to
> be attached to antennae? How to configure the WBX?
> 
> On "usrp2_fft.py", if the center frequency was set beyond 206 MHz, it would
> prompt "Failed". Why this happened? There was no such prompt using the FFT
> Sink on GRC.


Looks like maybe you are still using the default image on your SD card.

To use WBX with USRP2, you need to put the txrx_wbx.bin on the SD card,
which you can obtain by building the firmware from a recent git master
or by downloading from here:

http://gnuradio.org/releases/usrp2-bin/trunk/txrx_wbx.bin

Directions for updating your SD card can be found here:
http://gnuradio.org/redmine/wiki/gnuradio/USRP2UserFAQ#How-do-I-change-the-firmware-and-FPGA-code-on-the-SD-Card

Jason