The default TCal values used for standard calibration have been updated for the Ku-Band receiver.
We have recently altered the physical layout of the Ku-band receiver hardware so that each ‘beam’ or ‘feed’ of the receiver now shares a common noise diode for both ‘L’ and ‘R’ circular polarizations. For most observers, this change should not be noticeable, although it should be noted that the default ‘TCal’ values used for standard calibration have been updated.
If you have particular concerns regarding the calibration of Ku-band data, please reach out to your project friend or contact the helpdesk at https://help.nrao.edu/