Re: [Discuss-gnuradio] GRC: sending IQ samples of square is resulting with lot of noise.

[srinivas naga vutukuri]

Thank you Jason, I could able to see the exact waveform of the samples 
from One USRP2 to another USRP2. But i found the scaling of the 
amplitude when I see from usrp2_fft.py and attaching a Scope Sink (like 
oscilloscope scope sink), there is much variance, which usrp2_fft.py is 
showing much amplified scale, but the real one of Scope Sink in the GRC 
is showing very very low amplitude factor, Is there any understanding is 
required here? And if i want to get some amplified result what to be done?


best regards,
srinivas.

Jason Uher wrote:
> On Wed, Jan 27, 2010 at 3:31 AM, srinivas naga vutukuri
> <address@hidden> wrote:
>   
> > Am sending a +1 to -1 amplitude square wave samples from Tx and when i
> > capture on Rx end its not almost a square wave. I have generated the above
> >     
>
> I believe this is the maximum output power for the USRP2, and your are
> likely seeing distortions from the non-linearity of the circuits
> involved.  I'm not sure what the linear range is for your
> daughterboards, but try turning it down to +/- 0.3 and see what
> happens.
>
> Also, make sure that your decimation/interpolation factors are
> correct.  That is, if the DAC and ADC are operating at different
> sample rates, you have to adjust your int/dec factors or samples per
> symbol accordingly.
>
> Jason
>
>