From my limited understanding of the Y factor noise measurement you only need to measure power ratio in a not so critical frequency band. Correct?
If yes. The CH1 input can function as a power meter with a not so we'll defined bandpass filter
Sensitivity is limited by the noise factor of the SA or about 5 and leakage from the SI5351
In console mode you can switch to measuring the CH1 power without the DSP filter so you use the adc anti alias filter as band filter. It's basically working as a direct conversion to DC receiver.
