GRC problem :no GUI during use USRP n210 and WBX daughtherBoard

hello ,
i am new in usrp and GNU radio ,…
i have usrp n210 and wbx (50-2200 Mhz) daughter board ,
i have installed GRC on Ubuntu 12.04 LTS ,
i wrote the .GRC file and generate the python code …
when i use my hardware to transmit a signals using ( usrp sink ) …
there
are interface and a signal will appears and no problems…

but when i 'm trying to receive signals (FM signals for example ) ,… ,
in
the usrp n210 motherboard … the led C ( receiving) is on , but in the
graphical interface … no signal appear …
also i used the command ( " iptraf " ) to view if there are a traffic on
the interface eth0 ,
there are traffic but the software dosen’t comprehend the receiving Data
,

// UDP (52 bytes) from 192.168.10.20:49157 to 192.168.10.1:47842 on
eth0
// UDP (52 bytes) from 192.168.10.20:49157 to 192.168.10.1:47842 on
eth0

please help me … i don’t know why no signal appears in GUI …

how may i receive signal ? and is there another method to receive
signal?

thanks you lot .

On Wed, May 15, 2013 at 2:53 AM, Firas S. [email protected]
wrote:

graphical interface … no signal appear …

thanks you lot .

Are you sure there should be a signal where you are looking? Have to
tried to adjust the gain of the USRP receiver?

Tom