Re: [Discuss-gnuradio] AGC using RXPGA on MxFE

[Eric Blossom]

On Tue, Jul 19, 2005 at 06:08:27AM +0500, Ahmad Sheikh wrote:

> The USRP user guide states that there is 20 db of gain on the
> USRP. Assuming that this is on the Receive path Programmable Gain
> Amplifier on the MxFE, can this be used as an AGC?

Yes.

> I want to control the strength of the signal received. The way to do
> this, I think, would be to dynamically alter the value written to
> the Rx A/Rx B registers, using some feedback control
> mechanism. Would this control be on the FPGA, or GNU Radio
> Python/C++ software using usrp.source_c().set_pga()? Is there
> already some structure provided to do this?

The easiest way is using usrp.source_c().set_pga()

Eric