> From: Marcus D. Leech <mle...@ripnet.com> > Subject: Re: [Discuss-gnuradio] USRP with Basic_RX > To: "Johnathan Corgan" <jcor...@corganenterprises.com>, > Discuss-gnuradio@gnu.org > 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 > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio