Dear Robert, thanks for the quick and helpful reply. Turning off this calibration feature solves the issue.
Kai Am Mi., 13. Feb. 2019 um 17:05 Uhr schrieb Robert via USRP-users < usrp-users@lists.ettus.com>: > Hi Kai, > > > > I faced the same issue. Apparently it is linked to the quadrature error > correction (QEC) and can be solved turning off this calibration. This can > be done by setting init_cals=BASIC, where you can add the relevant > calibrations but avoid RX_QEC_INIT, see > https://files.ettus.com/manual/page_usrp_n3xx.html#n3xx_mg_calibrations. > > > > Robert > > > > *From:* USRP-users [mailto:usrp-users-boun...@lists.ettus.com] *On Behalf > Of *Kai-Uwe Storek via USRP-users > *Sent:* Wednesday, February 13, 2019 4:53 PM > *To:* usrp-users@lists.ettus.com > *Subject:* [USRP-users] N310 Images with external LO > > > > Hey Folks, > > > > I'm struggling with the external LO feature of my N310. This issue might > be related to > http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2018-April/056233.html > . > > > > Setup: > > Signal generator outputs a continuous wave at 2.002 GHz (-50dBm) to the > RX2 of RF0. With internal LO everything is fine (see pic1). > > > > Problem: > > In the next step I use the device argument "rx_lo_source=external" and > provide a 4 GHz CW with 3 dBm at LO IN 0/1 RX. The spectrum now shows a > significant image of the input signal. I played around with level of > external LO without any changes. > > > > Any ideas? > > Thanks in advance! :) > > > > Kai > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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