Re: [Discuss-gnuradio] Spectrum_sense of a smaller banwidth

[Adi85]

Ok..here is my code and my error message:

class topBlock(gr.top_block):
    def __init__(self):
        gr.top_block.__init__(self)

        fftsize = 4096
        udecim = 256

        mywin = window.blackmanharris(fftsize)
        fft = gr.fft_vcc(fftsize, True, mywin)

        signal = usrp.source_c(0,udecim)    # signal from Basic RX,
decimation=256
        throttle = gr.throttle(gr.sizeof_gr_complex, 100000)    #
throttle=100k
        v = gr.stream_to_vector(gr.sizeof_gr_complex, fftsize)    # complex
in, 4096 length

        v_sink = gr.vector_sink_c()
       
        self.connect(signal, throttle, v, fft, v_sink)

        # Do stuff with v_sink.data()

if __name__ == "__main__":
    print "Initilizing.."
    tb = topBlock()
    print "Flowgraph start.."
    tb.start()
    print "Exiting.."


Error message:
Initilizing..
Traceback (most recent call last):
  File "u0.py", line 30, in <module>
    tb = topBlock()
  File "u0.py", line 24, in __init__
    self.connect(signal, throttle, v, fft, v_sink)
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py",
line 70, in connect
    self._connect(points[i-1], points[i])
  File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py",
line 76, in _connect
    dst_block.basic_block(), dst_port)
  File
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py",
line 1469, in connect
    return _gnuradio_swig_py_runtime.gr_top_block_sptr_connect(*args)
ValueError: itemsize mismatch: fft_vcc_fftw(1):0 using 32768,
vector_sink_c(5):0 using 8


To be more specific I have a complex fft connected to a complex vectors sink
so I do not know why it apears Item size mismatch!

Thank you 
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