This communication presents the application of the source reconstruction technique to the processing of measured data in tasks such as the filtering of disturbances such as undesired coupling with the supporting structure or the feeding and in NF-NF transformation. The filtering technique is based on the dual-equation formulation of the source reconstruction method in order to obtain equivalent sources that can be effectively segmented into desired and undesired contributions. Results on measured and full-wave data confirm the effectiveness of the filtering and transformation computations and demonstrate its utility in measurement facilities.