I assume you're using a BasicRX/TX combo and a recent UHD version (3.11 and above).
How exactly are you using receiving? Are you sending a single stream command, or multiple stream commands? If its the latter, are you setting time stamps? -- M On 06/05/2018 11:25 AM, Nicolai Kern via USRP-users wrote: > Dear all, > > I am trying to investigate the streaming and buffer behaviour of a X310 > USRP as receiver. To this purpose, one X310 generates a continuous > triangle signal with each slope spanning over 1e5 samples. For reception > I use another X310 which receives 1e6 samples in total. Transmission and > Reception start simultaneously (works fine). The Code is written in C++ > on a Ubuntu Notebook. The stream_cmd requests continuously packages > containing 1e5 samples. The rx_buffers have a size of 10000 and are > filled in a loop by calls to the recv-function (requesting 10000 > samples). The samples are written to a file. The reception aborts after > 1e6 samples have been received - with this parameters after 100 loop > iterations. > > Both USRPs use the same sampling rate (0.5 MSps) and each uses a GPSDO > as reference. From an RF and communication engineering point of view > everything works fine, but the following error occurs in the streaming/ > receiving of the samples: > > The first triangle in the puls train seems to be received normally, but > then after ~1.3e5 samples (in the falling slope of the first triangle > puls) it is suddenly interrupted and starts again from the beginning. > This occurs only during the first pulse, all subsequently received > triangles are correct. > > I cannot figure out why the X310 or UHD are mixing up/ repeating > samples. I tried different streaming modes, different buffer sizes and > so on, but nothing could solve the problem. > > As I'm at my wits' end, I would appreciate any help. > > Best regards, > Nicolai > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
