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Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passe

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format.
Date: Mon, 25 Apr 2011 07:19:16 -0400
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On 04/25/2011 03:45 AM, ton ph wrote:
> Thank marcus for the information ,
>   Thou it may be a out of track question , is that possible by using
> any of the daughter board available to process 100 Mhz of bandwidth
> ... more correctly what can i do, for Exp: if i want to access a
> bandwidth of range 105 Mhz ... will usrp be able to support, because
> as i think gnuradio can support only 8Mhz bandwidth at a time , will
> we be able to make changes in gnuradio ? ....  I highly apologize if
> any of my question is illogical or out of track.
> Thanks
The USRP2 and N2XX series sample signals at 100Msps, so the FPGA "sees"
100MHz of incoming
  bandwidth.  But the absolute most you can send down the 1GiGE
interface to the host is 25Msps.

If you modified the FPGA code to send 8-bit samples to the host, you
might be able to do 50Mhz,
  and with 4-bit samples, 100Mhz.   At least in theory.

In practice, you'll have a hard time processing that much bandwidth on
the host computer, unless it's
  a really fast computer, and you're not doing anything even vaguely
complicated with the signals
  on the computer.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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