Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format.

[ton ph]

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

On Fri, Apr 22, 2011 at 7:14 PM, Marcus D. Leech <address@hidden> wrote:

On 04/22/2011 01:54 AM, ton ph wrote:
>
> Hi guys ,
>     I am using DBSRX , now i am trying to trace the data flow in the
> usr-gnuradio . I see AD9862 ADC  in the usrp and some of the block
> diagrams , and i think that the daughterboard
> passes the analog signals to the ADC in the I and Q format . Please
> guide me if this is right or wrong ... Thanks .
>

That is precisely correct, yes.  Most daughterboards use an analog
quadrature mixer to produce
 a complex (I and Q) baseband signal.

The TV_RX is one that *doesn't* -- it's a conventional superheterodyne
receiver, with a final IF
 frequency of (as I recall) 5.75MHz, which is passed to a single ADC
channel, and the FPGA
 mixes it down to a complex baseband digitally using a digital
quadrature mixer.

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



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