[USRP-users] Rx/Tx Loopback

Marcus D. Leech mleech at ripnet.com
Wed Apr 1 22:58:14 EDT 2015

On 04/01/2015 05:57 PM, Rob Kossler via USRP-users wrote:
> I would like to run a simple Rx to Tx loopback using gnuradio 
> companion with my X310.  The attached flowgraph contains two blocks, a 
> UHD source and UHD sink, which are directly connected to each other on 
> each of the 2 channels.
> When I run it, I get numerous "L" indications.  To me, this indicates 
> that I'm not delivering the samples to the Tx Streamer when it wants 
> them.  Perhaps the start times for RX streaming and TX streaming need 
> to be specified?  If so, can this be done from GRC?
> Thanks.
> Rob
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> USRP-users at lists.ettus.com
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The only thing I notice is that you've specified a really-low sample 
rate, one which I'm thinking the X310 cannot support, did you get any 
error messages
   to that effect when it's running.

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