Hi Ali - I think the issue is that the output of the C2M is of item_size 'fftsize', whereas the message_sink has item_size of 'gr.sizeof_float'. Try incorporating the 'gr.vector_to_stream' you created between the C2M and the message_sink. - MLD

On May 21, 2009, at 11:34 AM, ali siddiqi wrote:
signal source --> stream2vector -->  fft -->  c2m --> msg_sink


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