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Re: [Discuss-gnuradio] How to capture the Rx data using uhd_rx_cfile and

From: LD Zhang
Subject: Re: [Discuss-gnuradio] How to capture the Rx data using uhd_rx_cfile and agree with the uhd_fft Scope mode data
Date: Fri, 28 Sep 2012 16:34:37 -0700

I looked and ran the attached GRC file. It does work. I have a question on whether the slider gain is applied before or after the ADC?


On Fri, Sep 28, 2012 at 3:28 PM, Josh Blum <address@hidden> wrote:

On 09/27/2012 02:42 PM, LD Zhang wrote:
> Yes. I can understand the LFRX does not have any adjustable gain. But what
> comes out of the USRP source should be samples already digitized. Surely
> there is gain to be adjusted before the ADC. According what I see, it is
> from 0 to 6dB (in voltage?). I don't see how this can be inserted into the
> USRP source block.

You are correct. The N210 has a 6db digital gain. Attached is a GRC
flowgraph that loopsback TX and RX with Basic daguhterboards. You can
see the digital gain slider in action.

The gain parameter in the GRC block is a amalgamation of ADC and RF
frontend gain elements. The API also allows for individual control, but
this level of control is not available in the GRC gain parameter.

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