[Discuss-gnuradio] How is "UU" generated

[Feng Andrew Ge]

Another question is how "UUU" gets generated---I still got many of 
them?  Further, "UUU" makes sense when GNU Radio works with an audio 
device; however, I am not sure about its use when GNU Radio sends 
non-continuous data to USRP. When this "UUU" happens, will it be 
possible that some samples get held somewhere or even get dropped? I 
assume not, but like to get your confirmation.

Andrew