The only card with AGC is TVRX2, and it cannot be disabled.
Oh, you were talking about the daughterboard
itself. No guarantees there, but the schematics are all
available. I think there was a recent discussion about this on
the list. What I was saying specifically, was that there is no
AGC in the USRP motherboards/FPGA. Daughterboards are separate,
but in general, I don;t think they have AGC. The WBX and some
others, for instance, use fixed gain amplifiers with a variable
attenuator to control power.