[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
http://www.sbrac.org






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