[Discuss-gnuradio] USRP2 XCVR2450 receive problem

[XIAN PAN]

Hi,
 
I met a problem for receiving signal by the USRP2-XCVR2450.
 
Already installed GNU Radio 3.3.0 and The latest firmware and Raw Ethernet FPGA images have been written
onto the SDRAM: u2_rev3-20100603.bin, u2_rev3-20100603.bin.

I used usrp2_fft.py and the centre freq is 2.421G (I typed my bluetooth keyboard quickly that would send many packets on frequence 2.421G). But the usrp2_fft.py script shown only noise, none of the useful signal could be received on my USRP2 (see the picture in the attachment). Is there a USRP2-XCVR2450 receive problem while using the latest firmware and raw ethernet FPGA code?
 
Thanks
Lion

test2421.png
Description: PNG image