Re: [Discuss-gnuradio] USRP with Basic_RX

[ematlis]

> From: Marcus D. Leech <address@hidden>
> Subject: Re: [Discuss-gnuradio] USRP with Basic_RX
> To: "Johnathan Corgan" <address@hidden>, address@hidden
> Date: Tuesday, June 1, 2010, 2:32 PM
> On 06/01/2010 03:15 PM, Johnathan
> Corgan wrote:
> >
> > I think he's using a USRP2.  Isn't the dual
> source USRP1 only?
> >
> > What he's asking for is a dual, coherent DDC for the I
> and Q inputs of
> > a BasicRX in a USRP2.  This is a common enough
> request that I think it
> > would be useful to put into the stock FPGA
> functionality of UHD, using
> > VRT to separate the samples into two separate
> streams.
> >
> > Johnathan
> >
> >   
> Yes, that's precisely what I want.  I want to be able
> to treat the two
> inputs of a Basic_RX as
>   real-sampled data that are largely independant, but
> they're both tuned
> to the same frequency.
> 
> This is for precision radiometry, with a "outside world"
> channel and a
> "reference" channel.
> 
> There are a couple of approaches--one using a reference
> channel, and the
> other switching the
>   entire gain chain between "outside world" and
> "reference".  I want to
> explore both options.
>   The switching option would use a single input, with
> the input switched.
> 
> 
> 
> -- 
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
> 
> 
> 
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> 

If there is going to be a discussion on adding more functionality to the USRP2, 
then I would like to endorse the development of another independent DDC in the 
FPGA of the USRP2.  I currently use 2 LFRX daughter cards in the USRP1 to 
obtain 4 independent real channels; I would love to be able to do the same with 
2 USRP2's connected via a MIMO cable.

Thanks,
eric