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?
LD On Fri, Sep 28, 2012 at 3:28 PM, Josh Blum <j...@ettus.com> 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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