[Discuss-gnuradio] Problems with dvbt 8k 64QAM

Hello, I am trying to receive a real channel of 8K 64QAM 1/4 2/3 using as a base the example dvbt_rx_demo_8k and a hackrf

If I use the adv16.cfile file as a source, the constellation hooks independently of whether I put 16QAM or 64 QAM (the representation is only 16 points). But  if I do use the hackrf (many oooooooooooooooooooooo) or the hackrf recording using gqrx (here there is no ooooooo ) I only get a central point in the output of the FFT block

and many points moving wildly at the exit of the block dtv_dvbt_demod_reference_signals_0

If the signal does not engage in the constellation in my opinion it is clear that everything that comes after will not be useful at all

Best  Regards