In this section we will review and construct basic signals. For this tutorial, use the Y option when calling doing SSH. First you are going to want to resolve a space on SB3 before continuing on with the tutorial. {{{ ssh -Y username@sb3.orbit-lab.org }}} Check that the nodes are powered ON: {{{ omf stat -t all }}} If one or both of the nodes are in a powered off state turn them on with: {{{ omf tell -a on -t all }}} Next to get the latest updated image with updated gnuradio libraries enter: {{{ omf load -t all -i ubuntu-14-04-64bit-sdr-full.ndz }}} After calling the nodes will power down after imaging. Turn them back on and enter: {{{ ssh -Y root@node1-1 }}} *Note if this doesn't work the first time, the node might be recovering from imaging. Wait a few seconds and try again. Enter on the command line: {{{ gnuradio-companion & }}} From the available blocks construct the schematic displayed in: [[Image(sawtoothbuild.png)]] this will allow you to view the signal and its frequency plot equivalent similar to the image below: [[Image(sawtooth.png)]]