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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 10:38:07 -0800 (PST)

Thanks Karthik!

I will take a look at the attachment.  That is great, I want to eventually sample 4 real channels, and want to avoid the overrun/underrun problems.

Thanks for your help!!


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

From: Karthik <address@hidden>
Subject: Re: [Discuss-gnuradio] Multiple Channel USRP Confusion
To: "dan s" <address@hidden>
Cc: address@hidden
Date: Wednesday, March 10, 2010, 12:52 PM


I have a solution that I have been using for a while. I have attached the relevant files and a working example. You will need to put all the files except the .grc file into your .grc_gnuradio directory and restart grc. Not sure if this is a good way to do it, but it works for me.

the helper blocks are the core, the dual_a, dual_b are heir blocks that add on top of this one. I also included a quad source block for real inputs using 2 LFRX in case you are interested. I have changed the fusb parameters such that I can records data at high sampling rates (4MSps) without getting overruns.

Hope that helps.


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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