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Re: [Discuss-gnuradio] Full duplex problem in usrp N200

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Full duplex problem in usrp N200
Date: Tue, 09 Aug 2011 22:43:51 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110617 Lightning/1.0b2 Thunderbird/3.1.11

On 08/09/2011 09:52 PM, tahir siddiqui wrote:
> Hello,
> I am currently working on DSA in mesh network for this purpose I have been 
> using
> Gnuradio and USRP for practical implementation.
> Previously I was using USRP1 with RFX2400 board for that the full duplex
> mode was working fine (.i.e. Transmit and receive simultaneously).
> However last week we purchased new USRP N200 with SBX daughterbard for
> our project but I am unable to perform full duplex operation on it. I
> can either transmit or receive at a time. When I try to perform transmit
> and receive operation together (starting receive first then transmit
> later or vice versa) I get an error "that device not found at the
> specified address:".
> I have installed the latest firmware and image as well as the gnuradio+uhd 
> version.
> can anyone help me to sort out this problem ?

I assume you are trying to open the same device in multiple processes?
In this case, it is working perfectly. The rule is 1 process per device.


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