No particular fault. However, the outputs from the USRP are almost
always some kind of complex values. They may be encoded as 16-bit I &
Q, or 8-bit I & Q or 4-bit or 2-bit or 1-bit. The question is how do
we want to deal with them downstream from the USRP? The existing
usrp.source_s could be considered broken (although there are users of
it.) The data is really interleaved 16-bit I & Q, though it's
presented as if each sample was only 16-bits wide. In fact a "sample"
is really composed of 2 16-bit values.