[USRP-users] Rx/Tx Loopback

Rob Kossler rkossler at nd.edu
Wed Apr 1 23:38:58 EDT 2015

Here is the screen shot.

On Wed, Apr 1, 2015 at 6:53 PM, Richard Bell <richard.bell4 at gmail.com>

> Rob,
> If you attach a screenshot, as opposed to the actual grc file, you will
> get a lot more people to look at it.
> v/r,
> Rich
> On Wed, Apr 1, 2015 at 2:57 PM, Rob Kossler via USRP-users <
> usrp-users at lists.ettus.com> 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
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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