AGC and PGC

Dear all,

I would like to compare two signals in two distinct bands of frequencies
(energy in particular) with the TVRX module.

Is there an AGC in the USRP/TVRX module ? If yes, how can I get its
value ?
How the programmable gain (set with the command set_gain of the sub
device) impacts on the energy signal ?

Thanks for your answer !

Pierre Jallon