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:[email protected]] On Behalf Of Kai-Uwe Storek via USRP-users Sent: Wednesday, February 13, 2019 4:53 PM To: [email protected] 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
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