I have tested the LimeSDR mini (the old and new version) in the LTE eNB from srsRAN and openairinterface5G. In figure 1, there is the spectrum when running the LTE eNB from User Guide — LibreCellular 21.04 documentation srsRAN after the LimeSDR calibration is finished. As shown, the spectrum seems OK after the calibration is finished. However, during the calibration, a lot of spurious appear in the spectrum as shown in figure 2 (span of 3 GHz) and figure 3 (span of 54 MHz). In those tests, I used tx_gain = 53 and an attenuator of 30 dB at the output of the LimeSDR mini. So, the power of those spurious is high, around 6-8 dBm. The results are similar when I use soapy or eNB from openairinterface5G, with LimeSDR v.1 or LimeSDR v.2. I am concerned that these spurious can damage the power amplifiers like ZHL-1000-3W+ from minicircuits (https://www.minicircuits.com/WebStore/dashboard.html?model=ZHL-1000-3WX%2B) whose absolute maximum rating input RF power is 0 dBm. So, I would be very grateful if someone can give me a direction how to minimize those spurious during the LimeSDR mini calibration process. Best regards, Sindi.