Rosenberger Hochfrequeńztechnik Gmbh & Co. Kg

Benjamin Kaindl

Christian Entsfellner

Martin Schwab

A method for ascertaining an Intermodulation source by measuring intermodulation in a transmission link having the steps of simultaneously supplying a first and second test signals to the transmission link; measuring an output signal from the transmission link in response to the supplied test signals and analyzing the output signal in a discrete frequency spectrum to determine an intermodulation signal level (P) at a discrete intermodulation frequency (f), the measurement frequency range of the frequency spectrum having at least the signal level (P) associated with a further discrete measurement frequency (f).

Intermodulation measurement method, intermodulation measuring apparatus and computer program for ascertaining an intermodulation source in a transmission link

A method for measuring intermodulation produced in a measurement segment of a signal transmission path, by: producing a first HF signal (u(t)) and a second HF signal (u(t)), both having a predetermined frequency progression; feeding the first HF signal (u(t)) and the second HF signal (u(t)) to the signal transmission path, wherein an intermodulation signal is produced, which intermodulation signal has a first intermodulation signal component (u(t)) produced in an input segment of the signal transmission path and a second intermodulation signal component (u(t)) produced in the measurement segment of the signal transmission path; producing a compensation signal (u(t)) in accordance with the first intermodulation signal component (u(t)) produced in the input segment; introducing the compensation signal (u(t)) into the signal transmission path in order to reduce or cancel out the first intermodulation signal component (u(t)). The invention further relates to a measuring device for performing said method.

Method for measuring passive intermodulation and measuring device

A method for intermodulation measurement for locating points in a signal transmission path for a high-frequency signal that are faulty with regard to HF transmission properties of the signal transmission path, by generating a first HF signal u, having a carrier frequency fand a digital signal umodulated thereon; generating a second HF signal uhaving a frequency f; introducing the first HF signal uand the second HF signal uinto the signal transmission path at a predetermined introduction point; receiving an intermodulation product, which is generated in the signal transmission path from the first HF signal and the second HF signal at at least one faulty point, as an intermodulation product signal u; recovering a digital signal ufrom u; and determining a time shift tbetween the digital signal uand the recovered digital signal u. The invention further relates to a measuring device for performing this method.

Method and measuring device for intermodulation measurement

A method for locating defects in a signal transmission path by generating an HF signal having a frequency fand a signal modulated by a predetermined type of modulation; generating a HF signalhaving a frequency f; generating an intermodulation product in the form of an intermodulation product signal having frequency ffrom HF signalsandintroducing the HF signalsandinto the signal transmission path at an introduction point; receiving an intermodulation product from the HF signalsandat 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 tbetween 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 t.

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Fridolfing, Germany

Benjamin Kaindl