Re: [Discuss-gnuradio] problem with flowgraph

[Eric Blossom]

On Wed, Jul 29, 2009 at 11:46:12AM -0400, Sriram Krishnan wrote:
> Hello,
> I am working on a small application which is supposed to receive/send  
> data packets(i have two usrp nodes)  and sense spectrum for any energy  
> that may be present.
>
> I am using benchmark_rx/tx.py for the same. I have modified the  
> receive_path.py in order to accomodate the spectrum sensing ability  
> (have used code bits from usrp_spectrum_sense.py) . Hence ,on the  
> receive side, I have a couple of flow graphs branching out of the usrp  
> source instance.
>
> I am able to sense the spectrum appropriately but the problem is that  
> the data packet transfer between the nodes is deteriorating 
> significantly.
> Further, if I comment out the spectrum sense branch, the data packets  
> are exchanged very well.
> Can somebody help me figure out why this is happening.

Are you getting an uU's or uO's?  If so, you're running out of CPU
cycles.

Eric