Bug with USRP2/SBX and UHD when launching the acquisition

GNU Radio
1

Hello all,

I have a problem with my USRP2 (with a SBX board) :
Most of times when I launch the acquisition, no data are received.

For example with uhd_fft.py :

$ uhd_fft.py
linux; GNU C++ version 4.5.2; Boost_104200; UHD_003.002.001-fc349d3
– Opening a USRP2/N-Series device…
– Current recv frame size: 1472 bytes
– Current send frame size: 1472 bytes

and the FFT Plotter appear but is empty.

I have to try up to five times to make it work.

Anyone having the same problem ? Or do you know what may it be ?

If it can help, I am using a Gigabit Switch and Ubuntu 11.04

–
Emmanuel

2

On 08/05/2011 07:33 AM, Emmanuel Caill wrote:

– Current recv frame size: 1472 bytes
– Current send frame size: 1472 bytes

and the FFT Plotter appear but is empty.

I have to try up to five times to make it work.

Anyone having the same problem ? Or do you know what may it be ?

  1. If there were no samples, you would see a timeout error printed to
    the terminal.

  2. If the samples were all zero, press autoscale, you should see a
    horizontal blue line.

Which one do you see?

3

On 05/08/2011 10:33 AM, Emmanuel Caill wrote:

– Current recv frame size: 1472 bytes
– Current send frame size: 1472 bytes

and the FFT Plotter appear but is empty.

Also, what do you get with

uhd_usrp_probe --args “addr=192.168.10.2” (or whatever you’ve set the
IP addr of the USRP2 to).

4

2011/8/5 Marcus D. Leech [email protected]:

linux; GNU C++ version 4.5.2; Boost_104200; UHD_003.002.001-fc349d3

There are no samples (autoscale don’t do anything) and there are no
timeout errors.
I perfectly ping the device (with 0% packet loss).
I don’t understand why sometimes it works and at other times it
doesn’t (without changing any option).

$ uhd_usrp_probe
linux; GNU C++ version 4.5.2; Boost_104200; UHD_003.002.001-fc349d3

– Opening a USRP2/N-Series device…
– Current recv frame size: 1472 bytes
– Current send frame size: 1472 bytes

/
| Device: USRP2 / N-Series Device
| _____________________________________________________
| /
| | Mboard: USRP2-REV4
| | rev: 1024
| | mac-addr: 00:50:c2:85:3a:a4
| | ip-addr: 10.66.160.164
| | gpsdo: none
| | serial: 2724
| |
| | 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: SBX (0x0054)
| | | Serial: E7R10Y0XS
| | | _____________________________________________________
| | | /
| | | | RX Subdev: 0
| | | | Name: SBX (0x0054)
| | | | Antennas: TX/RX, RX2
| | | | Sensors: lo_locked
| | | | Freq range: 68.750 to 4400.000 Mhz
| | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | RX Codec: A
| | | | Name: ltc2284
| | | | Gain Elements: None
| | _____________________________________________________
| | /
| | | TX DSP: 0
| | | Freq range: -250.000 to 250.000 Mhz
| | _____________________________________________________
| | /
| | | TX Dboard: A
| | | ID: SBX (0x0055)
| | | Serial: E7R10Y0XS
| | | _____________________________________________________
| | | /
| | | | TX Subdev: 0
| | | | Name: SBX (0x0055)
| | | | Antennas: TX/RX
| | | | Sensors: lo_locked
| | | | Freq range: 68.750 to 4400.000 Mhz
| | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB
| | | | Connection Type: QI
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: ad9777
| | | | Gain Elements: None

(I had the same problem when I used the 192.168.10.2 IP)

5

2011/8/8 Emmanuel Caillé [email protected]:

$ uhd_fft.py
addr of the USRP2 to).
linux; GNU C++ version 4.5.2; Boost_104200; UHD_003.002.001-fc349d3
| | rev: 1024
| | | RX DSP: 0
| | | _____________________________________________________
| | | /
| | | ID: SBX (0x0055)
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: ad9777
| | | | Gain Elements: None

(I had the same problem when I used the 192.168.10.2 IP)

I fixed my problem : I replaced my Gigabit Switch with a crossed cable
and know everything work fine.

Thanks for your advices.

–
Emmanuel