Hi Cédric , For X310 USRPs, you need to loopback connect the antenna ports. For N321, you don't need. For other types, I don't know. Regards,Hongwei
On Monday, 26 February 2024 at 10:00:41 GMT, Cédric Hannotier <cedric.hannot...@ulb.be> wrote: Hello zhou, On 2024-02-23 20:44 +0000, zhou via USRP-users wrote: > It could be DC leakage. Try to run the calibration commands. For X310, you > need to loopback connect Tx and Rx antennas with 30dB attenuators. Do we need to loopback connect the antenna ports? >From the docs [1]: UHD software installs the calibration utilities [...]. Disconnect any external hardware from the RF antenna ports[...]. [1] https://files.ettus.com/manual/page_calibration.html#calibration_self_utils Regards -- Cédric Hannotier
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