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Re: [Discuss-gnuradio] Possible to build such a multiple input system on

From: Moritz Fischer
Subject: Re: [Discuss-gnuradio] Possible to build such a multiple input system on USRP/USRP2 ?
Date: Tue, 22 Dec 2009 12:11:01 +0100

On Tue, 2009-12-22 at 00:35 -0500, senlin peng wrote:

> I want to build a multiple input system with four incoming channels
> based on USRP/USRP2. The incoming samples of these four channels must
> be synchronized and feed into one computer.  The center frequencies of
> these four channels are different, but they are within the range of
> the DBSRX daughter board.  
My experiences showed me, that the DBSRX doesn't work that well in
multiantenna systems with synchronisation (in general for
synchronisation). I'd go for RFX1800s instead (in case you have the
> My question is how many USRP/USRP2 boards I
> need? 
If you manage to synchronize two USRPs then two, if you go for USRP2s
afaik it's 4. 
> Are there any examples about building a multiple input system?
In case of USRPs check the multiusrp code, I submitted a patch to get it
running with trunk some time ago. But I did not check since then.



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