Hi,
    I'm trying to use USRP to receive signals and collect the samples.Here is 
the flow graph:
    usrp_source_c-->stream_to_vector-->complex_to_mag-->vector_sink_f
    dst = gr.vector_sink_f()
    data =  dst.data()
    In my opinion, what stores in data should be the amplitude of the samples. 
But I found that len(data) is quite different for each running. I don't know 
why. I also want to know the time duration for each sample collecting. Thank 
you!
  Ally
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