This data archive contains raw Cassini downlinked telemetry and ancillary temperature data for use in reprocessing Cassini SAR data using the Cassini SAR processor. The Cassini SAR processor is now available at https://github.com/nasa-jpl/Cassini_RADAR_Software. To remove artifacts in SAR imagery due to thermal noise and compression error the Cassini SAR processor needs to extract compression coefficients from the raw downlinked data stored in this archive. The data is not human readable and only of use for users of the SAR processing software. In addition to the raw data, ancillary temperature data is also provided. Without the temperature data the radiometric calibration of the SAR images produced by the SAR processor is slightly degraded. The data is arranged by observation. Each observation has a directory whose name is the observation identifier, specified by one or two letters to indicate the name of the target body and a number to indicate which flyby. For example, t108 indicates Titan flyby number 108. The observation directory contains two subdirectories: “raw” which contains the raw data file; and “anc” which contains the three ancillary temperature files E-2503.gph, E-2505.gph, and E-2507.gph. The work reported here was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Copyright 2021 All Rights Reserved