[USRP-users] N210 with XCVR2450 Receives only Noise

Marcus D. Leech mleech at ripnet.com
Tue Feb 12 17:15:17 EST 2013

> Hello All:
> I'm just getting my feet wet with N210 via gnuradio-companion.  I've 
> been unsuccessfully trying to confirm my setup by receiving nearby 
> 2.4GHz 802.11g signals, and displaying them in an FFT.  I've tried 
> various BWs, center frequencies, and connecting to both antenna ports 
> but, thusfar, I'm only observing noise in the FFT.  A typical GRC 
> diagram I've been using is attached.
> Feels like I'm making a stupid/n00b mistake here, but i'm a little at 
> a loss...  perhaps incorrect FW?
> I'm running ubuntu 12.04LTS with GRC 3.6.3.  I upgraded the firmware, 
> having been prompted to do so, using the usrp_n2xx_net_burner.py 
> script to FW: usrp_n210_fw.bin and FPGA: usrp_n210_r4_fpga.bin .  The 
> images I used were bundled in the uhd-images_003.005.001-release tarball.
The main spectral lobe of an 802.11g signal is about 10Mhz wide, and 
very noise-like.

Make sure you're on the correct frequency, and see if unplugging your 
access point causes teh noise floor to come up and down.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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