Re: [Discuss-gnuradio] USRP2 and Data Rate

[Marcus D. Leech]

On 07/07/2010 11:32 AM, Garrett Wenger wrote:
> Hi all,
> A few days ago I made a simple program using grc to fsk modulate and
> transmit a pn sequence at 10kbps. Since I was using a USRP1, I set my
> samples per symbol to 25 and the interpolation to 512 to get this data
> rate.
>
> The place I work at just received a couple USRP2's, so I am trying to
> get this same program working with the new devices.  I realize that
> the DAC rate for the USRP2 is 100 MS/s instead of 128 MS/s, so I
> changed the samples per symbol and interpolation rate to  25 and 400,
> respectively, but this does not give me the 10kbps rate like I
> expected it would. 
>
> Is there something major that I am missing here?
>
> Thanks a lot,
> Garrett
Garrett:

The DACs on the USRP2 run at 400Msps, not 100Msps.  Although the *ADCs*
on the USRP2 do run
  at 100Msps, and that's perhaps where the confusion comes in.


-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org