A question about AD-FMCOMMS1-EBZ

Hi all:

We have a question about measurement AD-FMCOMMS1-EBZ

When we use this no-OS Driver from  ANALOG DEVICES WIKI

Set up the ML605 and AD-FMCOMMS1-EBZ

but the RF_out signal look like not lock in the spectrum with carrier frequency 2.4 GHz SPAN 100kHz(Signal offset range about 10kHz)

What S1 register configuration can i adjust RF_out signal?

Thanks for answer!