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Re: [Discuss-gnuradio] USRP - GNURADIO AGC

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] USRP - GNURADIO AGC
Date: Fri, 25 Jul 2014 16:09:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Hi Simone,

On 25.07.2014 15:55, Simone Ciccia S210664 wrote:
> Hi Marcus,
> thank you for your answer...
> Ok, suppose that we are in reception,
> I said before the PGA thinking that at this stage the signal is already in
> baseband ( MIXER -> FILTER -> PGA -> ADC ), so in this way I will have
> compared signal level before PGA with the full scale of ADC.
Actually, compare the schematics I linked to: the variable attenuation
comes before the mixer, so
Antenna->LNA->PGA->mixing->ADC is the order.
> But your are right, comparing energy is more simple!
> Just another question...
> Using the USRP as receiver, we set the gain as "variable" in UHD source
> block "options".
> Now, the changes of this variable take effect on the USRP during runtime???
> or just set the initial value and we need to use set_gain() ???
I suppose we're talking about GRC flow graphs now :)
Yes, there is a callback that will automatically set the gain when you
change the variable at runtime.
You *can* use set_gain() directly, too.


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