[USRP-users] Rx/Tx Loopback
Marcus D. Leech
mleech at ripnet.com
Wed Apr 1 23:38:07 EDT 2015
On 04/01/2015 11:35 PM, Rob Kossler wrote:
> ok. I'll try that. Thanks.
> Yes, the streams are going to the same physical device. But no 1 PPS
> input. My intention is to use X310 internal PPS. I think the GRC UHD
> sink/source setting for clock source is "default". I'm assuming that
> means internal PPS.
> On Wed, Apr 1, 2015 at 11:04 PM, Marcus D. Leech <mleech at ripnet.com
> <mailto:mleech at ripnet.com>> wrote:
> On 04/01/2015 11:00 PM, Rob Kossler wrote:
>> 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.
> May just be a buffering elasticity issue.
> Try putting something like a multiply-const block between them,
> with a constant of 1.0. Just to put some buffering in place.
> These streams are going to the same physical device, yes? And it
> has a 1PPS input?
>> On Wed, Apr 1, 2015 at 10:58 PM, Marcus D. Leech via USRP-users
>> <usrp-users at lists.ettus.com <mailto:usrp-users at lists.ettus.com>>
>> 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?
>>> USRP-users mailing list
>>> USRP-users at lists.ettus.com <mailto:USRP-users at lists.ettus.com>
>> 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.
>> USRP-users mailing list
>> USRP-users at lists.ettus.com <mailto:USRP-users at lists.ettus.com>
YOu have "don't sync" on the sink, and "unknown PPS" on the source.
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