As far as I understand the TVRx board has two AGC stages: An RF and IF AGC. Look in this file: (gnuradio-3.1.1/gr-usrp/src/db_tv_rx.py) to see how GnuRadio models the gain characteristics in the data sheet and subsequently sets the appropriate registers.
Here you will note that the PGA is also set, the PGA though does not reside on the daughterboard, but is part of the AD9862.
I'm sure the list will correct me, if i'm mistaken.
I would be interested to see how your work in this area progresses and I would appreciate it if you would keep me updated.
perhaps we could collaborate, i too am interested to investigate USRP and TVRx performance in various characteristics.
I'm working towards eventually building a PCL radar.
regards,
Aadil
Date: Thu, 13 Dec 2007 09:40:27 +0100 From: "JALLON Pierre 201932" <address@hidden> Subject: [Discuss-gnuradio] AGC and PGC
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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 ?