AD9361 loopback test

I know there is a lppoback test ,

When you tested things you set RX to FM Radio band (88..108 MHz) and TX to 2.4 GHz.

Then you used my spectrum analyzer FM demod function to demod FM radio @ 2.4.

I know you set the REG_CHAN_CNTRL_7 to  0x08,and I want to know to do this.

thanks