Simple Radio Example with USRP X310 on ORBIT Sandbox 2

Description

This tutorial shows a simple radio example - transmit a sine wave using an USRP X310 on ORBIT SB2, receive it on another X310 and view it.

Set Up

Make a reservation on the ​Orbit Scheduler for using SB2.

Prepare the nodes

• Load baseline-uhd-3_13.ndz on nodes 1-1 and 1-2.

  prasanthi@console.sb2:~$ omf load -i baseline-uhd-3_13.ndz -t node1-1,node1-2
  

• Once imaging is done, turn the nodes on and log in

  prasanthi@console.sb2:~$ omf tell -a on -t node1-1,node1-2
  prasanthi@console.sb2:~$ ssh root@node1-1
  

Prepare network setup for USRP access

Run the experiment

• Run rfnoc_spec_sense_display on the receive node. The command below starts the application to receive spectrum sensing samples from 4 USRP X310s at 100MSPS.

  root@node1-19:~/uhd/host/build/examples# ./rfnoc_spec_sense_display --args="addr0=10.10.23.11,addr1=10.10.23.12,addr2=10.10.23.13,addr3=10.10.23.14,skip_ddc,skip_duc" --freq 5e9 --gain 15 --ddc-args="input_rate=200000000.0,output_rate=100000000.0" --num-usrp 4 --spec-sense-args="avg_size=256"
  

• Run rfnoc_spreader on the transmit node. The command below starts the application to send a 50MHz wide PN signal on node23-17.

  root@node1-20:~/uhd/host/build/examples# ./rfnoc_spreader --args="addr=10.10.23.17,skip_ddc,skip_duc" --freq 5e9 --gain 15 --duc-args="input_rate=50000000.0,output_rate=200000000.0"
  

• Download spec_sense_display.html and open it in your browser. Once you click the Start button, you should see power spectrum display as shown below.