Hi Marcus, I am doing freq tuning in X310 USPR and find the description about sign may not be correct in the following page: https://files.ettus.com/manual/structuhd_1_1tune__request__t.html
Note that the meaning of the DSP frequency's sign differs between TX and RX operations. The target frequency is the result of target_freq = rf_freq + sign * dsp_freq. For TX, sign is negative, and for RX, sign is positive. Example: If both RF and DSP tuning policies are set to manual, and rf_freq is set to 1 GHz, and dsp_freq is set to 10 MHz, the actual target frequency is 990 MHz for a TX tune request, and 1010 MHz for an RX tune request. My results are as below (fs=200MHz): Tx Tune Result: Target RF Freq: 2080.000000 (MHz) Actual RF Freq: 2100.000000 (MHz) Target DSP Freq: -20.000000 (MHz) Actual DSP Freq: -20.000005 (MHz)Actual RF Freq + Actual DSP Freq = Target RF Freq Rx Tune Result: Target RF Freq: 2120.000000 (MHz) Actual RF Freq: 2100.000000 (MHz) Target DSP Freq: -20.000000 (MHz) Actual DSP Freq: -20.000005 (MHz)Actual RF Freq - Actual DSP Freq = Target RF Freq Kind regards,Hongwei
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