[Discuss-gnuradio] USRP FLEX900 Daughter Boards Calibration

Dear All:

I need to calibrate my USRP with Flex900 daughter boards to take real world
measurements in dBm. But I am confused with the gain parameter that is used
in usrp_fft.py.

1. Not sure whether the RFX900 board has a PGA of its own
2. Or is it just the AD9862 PGA before the ADCs
3. The gain bar/parameter varies over 0-90, what does this represent?
4. When you increase the gain from 0 till 30 or abouts there is no change in
the noise floor? why is that? 

If you have any docs that I can go through to understand the gain
characteristic, please.

Kind regards,

Shabbir
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