Configuring the Graphical UHD Source/Sink Block
Figure 1: GNUradio icon for an UHD Sink
By double clicking the UHD Source/Sink icon as shown in Figure 1, a couple important parameters must be configured. Refer to the Frequency Mechanics and Tuning Guide and Bandwidth and Sample Rate Calculations application notes for more information regarding the center frequency and sample rate.
For either a Source (RX) or Sink (TX):
Select the desired stream channel; 0 to 4 refer to channels A to D respectively.
Choose whether to use shorts or complex - the latter is fine for lower sample rates.
Pick a reasonable sample rate, depending on your bandwidth.
Enter the desired center frequency.