Re: [Discuss-gnuradio] USRP dynamic range / DBSRX measurements

[Jens Elsner]

Hi Firas,

yes, it's only somewhat related. I posted a question about the USRP
dynamic range a while ago (see link below) but didn't get a response.
Maybe you can comment on it.

The algorithm I used to calculate the figure on the Y axis was the sum 
over an estimate of the power spectrum density. The estimate was
calculated by averaging a 5000 FFTs of length 200, if I remember
correctly. I then used the same setup to measure the power of other
"stationary" but non-white signals in the bandwidth.

Best regards,
Jens

Link: http://lists.gnu.org/archive/html/discuss-gnuradio/2007-09/msg00153.html

On Wed, Dec 26, 2007 at 08:36:28AM -0800, Firas A. wrote:
> 
> Hi,
> 
> I think we are trying to do something different. We are trying to
> investigate the possibility of increasing USRP dynamic range by modifying
> some USRP FPGA stages. 
> By the way, what was the equation used to calculate the ADC output in dB in
> you graph?
> 
> Firas
> 
> 
> Jens Elsner wrote:
> > 
> > I noticed the discussion about the USRP dynamic range.
> > 
> > A while ago I made some measurements with a noise generator to calibrate
> > the USRP with a DBSRX daughterboard.
> > 
> > The resulting graph is attached.
> > 
> > Settings: room temperature, USRP, DBSRX, 2 MHz measurement bandwidth at
> > 940 MHz center frequency, cable loss accounted for.
> > 
> > Best regards,
> > Jens Elsner
> > 
> >  
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > 
> > 
> 
> -- 
> View this message in context: 
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> Sent from the GnuRadio mailing list archive at Nabble.com.
> 
> 
> 
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