i'm trying to demodulate a *cpfsk* modulation implemented through the block

*gr.cpfsk_bc( )*

my scheme is :

*bytes_source (a byte vector_source with one byte of stuffing inserted as first element of the vector)
gr.packed_to_unpacked_bb(1,  gr./GR_MSB_FIRST/ )
gr.cpfsk_bc(10,1,200)
file_sink (complex type)*

then after different un-succeeded attempts to demodulate the modulated file through the quadrature demodulator and converting the float output to byte i was wondering a different approach to demodulate the file by using the block

*gr.constellation_decoder_bc( )*

and then removing the stuffing byte to obtain the original file. My question so is which are , if possible, the parameters to pass to the constellation decoder in order to demodulate the CPFSK.

thx in advance

    Arturo
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