This is the GNU Radio UHD package. It is the interface to the UHD library to connect to and send and receive data between the Ettus Research, LLC product line. To use the UHD blocks, the Python namespaces is in gnuradio.uhd, which would be normally imported as: from gnuradio import uhd See the Doxygen documentation for details about the blocks available in this package. A quick listing of the details can be found in Python after importing by using: help(uhd)