On 2022-02-09 01:32, emanuel.staudin...@dlr.de wrote:

Hi Marcus,

Thanks for thoughts on this. We also believe that is has to do with the calibration mechanism of the AD9361, due to the very low sub-sample delay change.

Any thoughts from the Ettus team? Is there a way to retrieve calibration information from the RFIC in UHD? This could help to identify if there is a correlation between calibration setting and the group delay change.

Best regards,

Emanuel


Since UHD is an API that strives to provide an *abstraction* from the hardware, the RFIC details are not exposed   through the usual UHD API.   You will need to dive into the UHD source code  and into the low-level AD9361
  driver to extract any of that information.

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