Receiver NF questions for ADRV9002 eval board (0.03-3 GHz)

I would like to measure receive NF at 470 MHz on the evaluation board by measuring analog FM sensitivity and then calculating NF from there.  Figure 40 on page 34 of the data sheet displays about 12 dB NF when GAIN INDEX=255.  I understand when GAIN INDEX=255, the analog front end attenuation should be near 0 dB.  Figure 40 also lists "Baseband Frequency = 5.6 MHz and ADC=High Performance".  By "baseband frequency" is ADI referring to the receive IF frequency which is entered on the Carriers tab of TES?  I am using the RX2 input because that's the input TES enables when Analog FM is selected.

Thank you,

Eric 

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