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    • 5. 发明公开
    • METHOD AND APPARATUS FOR LOCATING FAULTS IN COMMUNICATIONS NETWORKS
    • VERFAHREN UND VORRICHTUNG ZUM LOKALISIEREN VON FEHLERN在KOMMUNIKATIONSNETZEN
    • EP2596582A4
    • 2016-01-27
    • EP11809078
    • 2011-07-19
    • KAELUS PTY LTD
    • DELFORCE GREGHORSFIELD BRENDAN
    • H03F3/68G01R23/20G01R31/08H04B17/00H04B17/345H04K1/02H04L25/00
    • H04B17/0085G01R23/20G01R31/08
    • 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.
    • 本发明涉及用于在同轴电缆网络中定位无源互调故障的装置。 根据本发明的一个实施例的测试装置(100)利用在HPA模块内部生成的一对高功率,频率合成的未调制的RF载波v1(t)(101)和v2(t)(102) 的装置。 v1(t)(101)和v2(t)(102)的功率和频率可以独立地设置为值范围,v1(t),v2(t)组合在仪器内部,然后应用于输入 的被测器件(DUT)。 在DUT中生成的PIM信号(107,108,109)被组合以产生主PIM信号vIM(t)(103)。 该装置还包括用于检测vIM(t)103和vREF(t)(104)的两个接收器(110,111,112,113,114,115)。 这些信号下变频至455 kHz。 两个455 kHz波形用双通道A / D转换器(116,117)数字化,并计算并存储数字波形之间的幅度比和相位偏移。