Method for locating points in a signal transmission path for a high frequency signal, said points being defective in terms of high frequency transmission characteristics of the signal transmission path, comprising the following steps, (a) Generation of a first HF signal with a constant predetermined frequency f 1 and a signal modulated by means of a predetermined type of modulation, wherein the type of modulation is an amplitude modulation or a digital modulation and/or wherein the superimposed modulated signal is a noise, in particular a pseudo-noise; (b) Generation of a second HF signal with a constant predetermined frequency f 2; (c) Generation of a predetermined iritermodulation product in the form of an intermodulation product signal with the frequency f IM-GENERATED from the first and the second HF signal (12, 18), (d) Introduction of the first HF signal and of the second HF signal into the signal transmission path at a predetermined introduction point; (e) Reception, at the predetermined introduction point, of an intermodulation product which is generated in the signal transmission path from the first HF signal and the second HF signal at a defective point and reflected back to the introduction point and which corresponds to the intermodulation product generated in step (c), in the form of an intermodulation product signal having the frequency f IM-RECEIVED; (f) Determination of a time lag t x between the generated intermodulation product signal f IM-GENERATED and the received intermodulation product signal f IM-RECEIVED by means of a cross-correlation and (g) Calculation of a length L between the introduction point and the point in the signal transmission path from which the signal received in step (e) has been reflected, from the time lag t x determined in step (f). (a) Generation of a first HF signal with a constant predetermined frequency f 1 and a signal modulated by means of a predetermined type of modulation, wherein the type of modulation is an amplitude modulation or a digital modulation and/or wherein the superimposed modulated signal is a noise, in particular a pseudo-noise; (b) Generation of a second HF signal with a constant predetermined frequency f 2; (c) Generation of a predetermined iritermodulation product in the form of an intermodulation product signal with the frequency f IM-GENERATED from the first and the second HF signal (12, 18), (d) Introduction of the first HF signal and of the second HF signal into the signal transmission path at a predetermined introduction point; (e) Reception, at the predetermined introduction point, of an intermodulation product which is generated in the signal transmission path from the first HF signal and the second HF signal at a defective point and reflected back to the introduction point and which corresponds to the intermodulation product generated in step (c), in the form of an intermodulation product signal having the frequency f IM-RECEIVED; (f) Determination of a time lag t x between the generated intermodulation product signal f IM-GENERATED and the received intermodulation product signal f IM-RECEIVED by means of a cross-correlation and (g) Calculation of a length L between the introduction point and the point in the signal transmission path from which the signal received in step (e) has been reflected, from the time lag t x determined in step (f).