[Discuss-gnuradio] about samples

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