Re: [Discuss-gnuradio] E100 Performance

[Marcus D. Leech]

On 29/06/2011 9:11 AM, Ralf wrote:
> Hi,
>
> the simple GRC in the attachment creates lots of underflows on our 
> E100 ("U" on console)
> and dropouts when looking at the spectrum.
>
> Is this as expected or how can this overload of the embedded Linux be 
> avoided?
>
> Thanks,
> Ralf
Well, for one, 60Khz isn't a proper divisor of the 128MHz sample rate of 
the DAC, which means it can't be properly interpolated.

The minimum sample rate that you can deliver to the USRP-E100 is 
128MHz/512 = 250kHz, so you'll have to interpolate your
  data stream up to 250kHz prior to "presentation" to the UHD sink block.