A method for locating defects in a signal transmission path by generating an HF signal having a frequency f1 and a signal modulated by a predetermined type of modulation; generating a HF signal 2 having a frequency f2; generating an intermodulation product in the form of an intermodulation product signal having frequency fIM-GENERATED from HF signals 1 and 2; introducing the HF signals 1 and 2 into the signal transmission path at an introduction point; receiving an intermodulation product from the HF signals 1 and 2 at a defective point and reflected back and corresponding to the generated intermodulation product, in the form of an intermodulation product signal; determining a time lag tx between the generated intermodulation product signal and the received intermodulation product signal by a cross-correlation and calculation of a length L between the introduction point and the place of signal reflection, from the time lag tx.