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

[Dimitris Symeonidis]

On Mon, Mar 9, 2009 at 17:22, Adi85 <address@hidden> wrote:
>
>
> 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
> --
> View this message in context: 
> http://www.nabble.com/Spectrum_sense-of-a-smaller-banwidth-tp22413464p22413681.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
>
>
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>

throw out the gr.throttle and the gr.stream_to_vector

Dimitris Symeonidis
"If you think you're too small to make a difference, try sleeping with
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