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      Return Path Analysis Set

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      CIU-01 Head-end return path monitor
      CIU-01 Head-end return path monitor
      On demand
      • Wide input measuring range: 40–126 dBuV
      • Frequency range: 5–865MHz
      • When works in return path analysis set:
        • measures pilot signals of GPS-01 generators
        • searches active GPS-01s
        • measures spectrum of a return path
        • measures frequency response of a return path
        • receives auxiliary information from GPS-01s
        • transmits results of all measurements through a forward path
      • Measurement in the forward path:
        • levels of carriers, carrier/noise, carrier/audio
        • spectrum with a different frequency span
      Description
      On demand
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      GPS-01 Return path pilot generator
      GPS-01 Return path pilot generator
      On demand
      • Generator can work in three modes:
        • generation of unmodulated signal
        • generation of pilot-signals
        • generation of scanning signal for measuring of frequency response function
      • The mode of GPS-01 is set with the computer, IT-081 or a built-in user interface
      Description
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      CIU-01 Head-end return path monitor.
      The monitor is intended for measuring of pilot-signals, injected by the GPS-01s, frequency response function and spectrum in the cable segment in the return band with. Results of measurements are displayed on a built-in screen and transmited through the forward path to IT-081.

      GPS-01 Return path pilot generator.
      GPS-01 forms signals for measuring frequency response function, for installation and control of the cable network state.

      IT-081: TV level meter.
      The TV level meter IT-081 performs measuring of TV signals parameters of 5 to 900 MHz range. IT-081 displays measurement results when it operates with the set.
      • The set is intended for installation purposes and maintaining of TV cable network with return band
      • The set allows to measure:
        • frequency response function of return band in the cable TV network
        • spectrum of return and forward path bands
      • All measurements are displayed on CIU’s screen and derived by IT-081 connected to any point of network

      Specification
      Frequency range
      5 - 65 MHz
      Frequency resolution
      125 kHz
      Level measurement range
      40 - 126 dBuV
      Level measurement accuracy
      ±2 dB
      Measuring time of pilot-signals
      <1,2 sec
      Measuring time of frequency response
      <2,5 sec
      Spectrum measuring time in over the range
      <15 sec
      Frequency range of dates transfer
      400 - 450, or 108-135 MHz
      Powered by
      220V ± 22V AC

      Set functioning

      The generator GPS-01 connects to a cable network point where it needs to correct level or control frequency response of return path. The mode of GPS-01 is set with a computer, IT-081 or a built-in user interface. It is possible to change number of pilot-signals (up to 4) and tune pilot signal frequencies in the 5 to 65 MHz range. Signals output levels are adjusted in the 72 to 118 dBuV range with the 0,75 dB step. Pilot-signals are generated consequently in time. Every signal contains a name code of generator and some auxiliary information. Moreover GPS-01 can work in a frequency scanning mode and an unmodulated single-tone mode. All parameters of the generator are saved during power switch-off.

      The monitor CIU-01 is installed in a head-end according to a current network configuration. After finding out the active pilot-generator and defining his signals frequencies, CIU-01 starts to measure pilot signal levels. After that searching of new pilot-generators, measuring both signals levels and a spectrum of return path is performed simultaneously. It is possible to have up to 8 active GPS-01 in the same network but pilot signals frequencies values have to differ each other. Results of measuring are transmitted back through the forward path.

      The TV level meter IT-081, connected in any cable network point, receives data from CIU-01 and displays it. It is possible to watch a spectrum of return path or pilot signals levels of any active GPS-01.

      The CIU measurement results can be read in via RS-232 interface for automatic monitoring over the cable network performance, statistics acquisition, real-time measurements and documenting the results. Documentation on the CIU communications protocol is provided upon request.

      • Vector Network Analysers
      • TV Meters
        • Compact TV Signal Analyzers Compact TV Signal Analyzers
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        • IT-100 Multisystem TV Signal Analyzer IT-100 Multisystem TV Signal Analyzer
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        • Mobile object monitoring system «Cupol-Zenit» Mobile object monitoring system «Cupol-Zenit»
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