The electrosurgical systems and methods of the present disclosure perform cable compensation using an electrosurgical generator that includes a plurality of sensors configured to sense voltage and current waveforms, a plurality of medium-band filters, a plurality of narrowband filters, and a signal processor. The plurality of medium-band filters and narrowband filters pass sensed voltage and current waveforms at a plurality of predetermined frequencies. The signal processor calculates medium-band RMS voltage and current values using the output from the plurality of medium-band filters, calculates narrowband phase and magnitude values using the output from the plurality of narrowband filters, calculates tissue impedance based on the medium-band RMS voltage and current values and the narrowband phase value, and generates a control signal to control the energy generated by the electrosurgical generator based on the calculated tissue impedance.

A method and device for operating an RF surgical assembly for the RF surgical removal of pathological tissue in hollow organs of a patient wherein the RF surgical assembly includes an RF surgical device having an RF generator for generating an RF current and a bipolar loop having two mutually insulated loop sections which can be brought electrically in contact with the tissue and wherein the RF generator has a first and an antipolar second output.