[USRP-users] N210 with XCVR2450 Receives only Noise

Mike Lucas michael.ethan.lucas at gmail.com
Tue Feb 12 17:00:39 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.

Running uhd_usrp_probe gives:

linux; GNU C++ version 4.6.3; Boost_104601; UHD_003.005.001-release
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
  _____________________________________________________
 /
|       Device: USRP2 / N-Series Device
|     _____________________________________________________
|    /
|   |       Mboard: N210r4
|   |   hardware: 2577
|   |   mac-addr: a0:36:fa:38:33:59
|   |   ip-addr: 192.168.10.2
|   |   subnet: 255.255.255.255
|   |   gateway: 255.255.255.255
|   |   gpsdo: none
|   |   serial: E5R23NAUP
|   |   FW Version: 12.3
|   |   FPGA Version: 10.0
|   |
|   |   Time sources: none, external, _external_, mimo
|   |   Clock sources: internal, external, mimo
|   |   Sensors: mimo_locked, ref_locked
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 0
|   |   |   Freq range: -50.000 to 50.000 Mhz
|   |     _____________________________________________________
|   |    /
|   |   |       RX DSP: 1
|   |   |   Freq range: -50.000 to 50.000 Mhz
|   |     _____________________________________________________
|   |    /
|   |   |       RX Dboard: A
|   |   |   ID: XCVR2450, XCVR2450 - r2.1 (0x0061)
|   |   |   Serial: E5R15YBXX
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Frontend: 0
|   |   |   |   Name: XCVR2450 RX
|   |   |   |   Antennas: J1, J2
|   |   |   |   Sensors: lo_locked, rssi
|   |   |   |   Freq range: 2400.000 to 6000.000 Mhz
|   |   |   |   Gain range LNA: 0.0 to 30.5 step 15.0 dB
|   |   |   |   Gain range VGA: 0.0 to 62.0 step 2.0 dB
|   |   |   |   Connection Type: IQ
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       RX Codec: A
|   |   |   |   Name: ads62p44
|   |   |   |   Gain range digital: 0.0 to 6.0 step 0.5 dB
|   |   |   |   Gain range fine: 0.0 to 0.5 step 0.1 dB
|   |     _____________________________________________________
|   |    /
|   |   |       TX DSP: 0
|   |   |   Freq range: -250.000 to 250.000 Mhz
|   |     _____________________________________________________
|   |    /
|   |   |       TX Dboard: A
|   |   |   ID: XCVR2450 (0x0060)
|   |   |   Serial: E5R15YBXX
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Frontend: 0
|   |   |   |   Name: XCVR2450 TX
|   |   |   |   Antennas: J1, J2
|   |   |   |   Sensors: lo_locked
|   |   |   |   Freq range: 2400.000 to 6000.000 Mhz
|   |   |   |   Gain range VGA: 0.0 to 30.0 step 0.5 dB
|   |   |   |   Gain range BB: 0.0 to 5.0 step 1.5 dB
|   |   |   |   Connection Type: QI
|   |   |   |   Uses LO offset: No
|   |   |     _____________________________________________________
|   |   |    /
|   |   |   |       TX Codec: A
|   |   |   |   Name: ad9777
|   |   |   |   Gain Elements: None

Thanks a lot for your help.

-Mike
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