[USRP-users] Rx/Tx Loopback

Rob Kossler rkossler at nd.edu
Wed Apr 1 23:00:31 EDT 2015

I don't recall any error message with the low sample rate.  But, I was also
using higher rates like 1 MS/s and 10 MS/s also.

On Wed, Apr 1, 2015 at 10:58 PM, Marcus D. Leech via USRP-users <
usrp-users at lists.ettus.com> wrote:

>  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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>  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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