The system is specified as operating in X-Band, but the building blocks of the signal chain are rated up to Ku band. Is the system capable of operating over a different frequency spectrum?

Yes. The ADAR1000EVAL1Z is rated from X to Ku Band and the ADXUD1AEBZ RF frequency is rated up to 17 GHz in Ku Band. We are providing a reference design for X-Band RF frequencies and C-Band IF frequencies. The RF/IF filtering of the ADXUD1AEBZ can be modified to fit a customer's specific band of interest and filter rejection requirements. The mixer on the ADXUD1AEBZ can also be tuned to provide an IF in the frequency range of DC to 8 GHz allowing flexibility to fit specific system requirements.