| | | | Bandwidth range: 250000000.0 to 250000000.0 step 0.0 Hz
| | | | Connection Type:
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: B
| | | | Name: dac37j82
| | | | Gain Elements: None
| | _____________________________________________________
| | /
| | | TX Dboard: A
| | | ID: Unknown (0x0152)
| | | Serial: 316D810
| | | _____________________________________________________
| | | /
| | | | TX Frontend: 0
| | | | Name: Rhodium
| | | | Antennas: TX/RX, CAL, TERM
| | | | Sensors: lo_locked
| | | | Freq range: 1.000 to 6000.000 MHz
| | | | Gain range all: 0.0 to 60.0 step 1.0 dB
| | | | Bandwidth range: 250000000.0 to 250000000.0 step 0.0 Hz
| | | | Connection Type:
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: dac37j82
| | | | Gain Elements: None
| | _____________________________________________________
| | /
| | | RFNoC blocks on this device:
| | |
| | | * Replay_0
| | | * Radio_0
| | | * Radio_1
| | | * DDC_0
| | | * DDC_1
| | | * DUC_0
| | | * DUC_1
| | | * FIFO_0
| | | * FIFO_1
If you see warnings such as:
[WARNING] [UDP] The recv buffer could not be resized sufficiently.
You need to resize the socket buffers for your network interface card:
sudo sysctl -w net.core.rmem_max=288000
sudo sysctl -w net.core.wmem_max=288000
sudo sysctl -w net.core.rmem_max=33554432
The UHD driver includes several example programs, which may serve as test programs or the basis for your application program. The source code can
be obtained from the UHD repository on github at:
https://github.com/EttusResearch/uhd/tree/master/host/examples
You can quickly verify the operation of your USRP N3xx by running the
rx_ascii_art_dft
UHD example program.
The
rx_ascii_art_dft
utility is a simple console −based, real-time FFT display tool. It is not graphical in nature, so it can be easily run over an SSH
connection within a terminal window, and does not need any graphical capability, such as X Windows, to be installed. It can also be run over a serial
console connection, although this is not recommended, as the formatting may not render correctly.
You can run a simple test of the N3xx USRP by connecting an antenna and observing the spectrum of a commercial FM radio station in real-time,
following the steps below:
1. Attach an antenna to the
Ch0/RX2
− antenna port of the N3xx.
2. From your host computer, run the command:
N300/N310
$ /usr/local/lib/uhd/examples/rx_ascii_art_dft --args "master_clock_rate=125e6,mgmt_addr=192.168.1.151,addr=192.168.10.2" --freq 98.5e6 --rate 2.5e6 --gain 50 --ref-lvl="-50" --dyn-rng 90 --ant "RX2" --subdev "A:0"
N320/N321
$ /usr/local/lib/uhd/examples/rx_ascii_art_dft --args "master_clock_rate=250e6,mgmt_addr=192.168.1.151,addr=192.168.10.2" --freq 98.5e6 --rate 2.5e6 --gain 50 --ref-lvl="-50" --dyn-rng 90 --ant "RX2" --subdev "A:0"
NOTE: Modify the command− line argument
freq
?above to specify a tuning frequency for a strong local FM radio station. You will also need to update
the IP Address to match your device IP.
3. You should see a real-time FFT display of 2.5 MHz of spectrum, centered at the specified tuning frequency.
4. Type "
Q
" or
Ctrl−-C
to stop the program and to return to the Linux command line.
5. You can run with the
?−−--help
?argument to see a description of all available command-line options.
Example Output:
$ /usr/local/lib/uhd/examples/rx_ascii_art_dft --args "master_clock_rate=125e6,mgmt_addr=192.168.1.151,addr=192.168.10.2" --freq 98.5e6 --rate 2.5e6 --gain 50 --ref-lvl="-50" --dyn-rng 90 --ant "RX2" --subdev "A:0"
Creating the usrp device with: master_clock_rate=125e6,mgmt_addr=192.168.1.151,addr=192.168.10.2...
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_3.11.1.HEAD-0-gad6b0935
[INFO] [MPMD] Initializing 1 device(s) in parallel with args: mgmt_addr=192.168.1.151,type=n3xx,product=n310,serial=313ABDA,claimed=False,master_clock_rate=125e6,addr=192.168.10.2
[INFO] [MPM.main] Launching USRP/MPM, version: 3.11.1.0-gunknown
[INFO] [MPM.main] Spawning RPC process...
[INFO] [MPM.PeriphManager] Device serial number: 313ABDA
[INFO] [MPM.PeriphManager] Found 2 daughterboard(s).
[INFO] [MPM.RPCServer] RPC server ready!
[INFO] [MPM.RPCServer] Spawning watchdog task...
[INFO] [MPM.PeriphManager] init() called with device args `mgmt_addr=192.168.1.151,product=n310,master_clock_rate=125e6'.
