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Re: [Discuss-gnuradio] Multiple Channel USRP Confusion

From: dan s
Subject: Re: [Discuss-gnuradio] Multiple Channel USRP Confusion
Date: Wed, 10 Mar 2010 10:34:02 -0800 (PST)

Thanks so much, this is exactly what I am eventually trying to accomplish.
Sampling 4 real signals using two LFRX daughtercards


--- On Wed, 3/10/10, Sebastiaan Heunis <address@hidden> wrote:

From: Sebastiaan Heunis <address@hidden>
Subject: Re: [Discuss-gnuradio] Multiple Channel USRP Confusion
To: "Karthik" <address@hidden>
Cc: "dan s" <address@hidden>, address@hidden
Date: Wednesday, March 10, 2010, 1:13 PM


I haven't used GNURadio companion before, but what you need to do is the following:

Set the mux to (0xf1f0f1f0).  This will connect ADC0 (which is the first ADC on side A) to the I input of the first DDC in the USRP.  ADC1 (which is also on side A) will be connected to the I input of the second ADC.  Then you just wire up your two chains in your GNURadio apps and use a deinterleaver to connect the appropriate channel to the right blocks in your app.  There is an example app somewhere in the Gnuradio installation directory that shows how to receive 4 real channels with 2 LFRX boards.



On Tue, Mar 9, 2010 at 10:33 PM, dan s <address@hidden> wrote:
Hi all,

I am looking to simultaneously record two real signals (not with IQ) using a single LFRX daughtercard.

How can I do this with GNURadio companion?  I have spent a while looking at the USRP Source and Dual USRP Source blocks and could not figure out.

I am looking to record from Side A with RXA and RXB.  I tried setting the RX Antenna setting to RXAB and used the complex to real block to extract channel RXA, and complex to imaginary block to extract RXB.  I don't think this worked properly.

I also tried using two separate USRP source blocks, each on side A but one for RXA and the other for RXB.  When I did this I got an error related to already having one USRP side A block running.

Any help would be greatly appreciated


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