Method and apparatus for locating faults in communications networks

US8995517B2 · kind B2 · utility

Assignee

• Kaelus Pty Ltd · AU

Inventors

• Greg Delforce · Brisbane, AU
• Brendan Horsfield · Calle de la Era, AU

Key dates

• Filing date: Jul 19, 2011
• Grant date: Mar 31, 2015
• Expiry date: Aug 31, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B17/17
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention relates to a device for the location of passive intermodulation faults in a coaxial cable network. The test apparatus (100) according to one embodiment of the present invention utilizes a pair of high-power, frequency-synthesized, unmodulated RF carriers v1(t) (101) and v2(t) (102) are generated inside the HPA module of the apparatus. The power and frequency of v1(t) (101) and v2(t) (102) can be independently set to a range of values, v1(t), v2(t) are combined inside the instrument and then applied to the input of the device under test (DUT). The PIM signals (107,108,109) generated in the DUT are combined to produce the primary PIM signal vIM(t) (103). The apparatus also includes two receivers (110,111, 112,113,114,115) for the detection of vIM(t) 103 and vREF(t) (104). These signals are downconverted to 455 kHz. The two 455 kHz waveforms are digitized with a dual- channel A/D converter (116,117) and the amplitude ratio and phase offset between the digitized waveforms are calculated and stored.