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Re: [Discuss-gnuradio] USRP with Basic_RX

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] USRP with Basic_RX
Date: Tue, 01 Jun 2010 15:32:14 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4

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

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