[USRP-users] Rx/Tx Loopback

Marcus D. Leech mleech at ripnet.com
Wed Apr 1 23:41:36 EDT 2015


On 04/01/2015 11:38 PM, Rob Kossler via USRP-users wrote:
> Here is the screen shot.
>
> On Wed, Apr 1, 2015 at 6:53 PM, Richard Bell <richard.bell4 at gmail.com 
> <mailto:richard.bell4 at gmail.com>> wrote:
>
>     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
>
I have to admit that I vastly prefer the .grc file--that way, I can open 
it up, look at parameter settings in blocks, etc.  A screenshot of the 
flow-graph
  tells only a small part of the story....

>
>     On Wed, Apr 1, 2015 at 2:57 PM, Rob Kossler via USRP-users
>     <usrp-users at lists.ettus.com <mailto: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
>
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>
>
>
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