Clear-Com IF4W4
4 Channel, 3- or 4-Wire Camera Interface


The IF4W4 modular 4-wire interface connects camera intercoms, two-way radios, fiber optics, and other 4-wire devices to a standard Clear-Com intercom line. The 1-RU chassis holds up to four individual interface modules, each with its own 4-wire terminal block and XLR-3M connector to interface with Clear-Com.

The IF4W4 accepts balanced or unbalanced 4-wire input and is transformer isolated. It is powered by the Clear-Com intercom line, using standard two-conductor shielded mic cable.

Front Panel Capabilities
Front-panel controls allow the user to adjust the operating parameters for each interface module, optimizing the interface between the 4-wire device and the party line. Capabilities include: adjusting the transmit and receive levels between the intercom system and the 4-wire line; optimizing the hybrid null balance; switching the transmit level between mic and line level; and emulating either a carbon or a dynamic microphone. A two-color LED transmit-level indicator gives a visual indication of send levels to the transmit lines.

A front-panel test jack is connected to a built-in oscillator. Using the null control and an earphone with a 1/8" plug or 4-pin headset, the user can quickly null the send/receive hybrid. Set-up switches allow the user to assign the interfaced devices to separate intercom channels, or to assign any or all to a single party line.

Each interface module has its own set of transformer-isolated connectors. The terminal block provides a pair of connections for both transmit and receive signals, with a 600-ohm load across the receive line. An XLR-3M connector provides the link between the interface and the Clear-Com intercom line.

Clear-Com IF4W4 Features:

  • Interfaces TV cameras, 2-way radios, fiber-opticcircuits, and other devices to Clear-Com party-line intercom
  • Each interface has individual transmit, receive, andnull controls
  • Transmit output switchable between mic and linelevel, with transmit-level indicator
  • Built-in test jack and oscillator enable quicknulling of the transmit/receive hybrid
  • Selective party-line capability
  • Accepts balanced or unbalanced 4-wire input
  • Terminal block and XLR connectors provided for eachinterface
  • Powered by the Clear-Com line

Clear-Com IF4W4 Specifications:

  • Program Line Input\
    • Input Impedance : >= 1K ohm
    • < /UL>
    • Party Line Output
      • Output Impedance: >10K ohms
    • Stage Announce/Balanced Line Out
      • Type: Balanced
      • Output Impedance:>= 80 ohms
      • Load Impedance: >= 600 ohms
      • < /UL>
      • Frequency Response
        • Program Input - Party Line: 200 - 18KHz ±3dB
        • Party Line - Line Out: 200 - 18KHz ± 3dB
      • Max Distortion
        • Program Input - Party Line: <= 0.2%
        • Party Line - Line Out: <= 0.5%
        • < /UL>
        • Noise
          • Program Input - Party Line: < -85dBu
          • Party Line - Line Out: < -60dBu
        • Max Gain
          • Program Input - Party Line: >= -16dB
          • Party Line - Line Out: >= 24dB
          • < /UL>
          • Min Gain
            • Program Input - Party Line: <= -20dB
            • Party Line - Line Out: <= -45dB
            • < /UL>
            • Line Out LED Threshold
              • Green: -7dBu ± 2dB=
              • Red: +5dBu ± 2dB
            • Party Line LED Threshold
              • Green: -10dBu ± 2dB
              • Red: 0dBu ± 2dB
            • Power
              • Input Voltage Range: 20-30 VDC
              • Input Current (Idle): <=40mA
              • Input Current (Max): <= 50mA
            • Rear Panel Connectors
              • Intercom: (4) XLR-3F (1 per channel)
              • 4-WireTerminal Block Connectors: (4) Connectors (1 per channel) 4-WireTransmit
              • Level Switches: (4) Switches (1 per channel)
            • Front Panel Connectors
              • Headset: (1) XLR-4M
              • TS1 Earphone: (1) 3.5mm Jack Socket
            • Front Panel Controls & Indicators
              • Green Level LED: (4) LEDs (1 perchannel)
              • Red Level LED: (4) LEDs (1 per channel)
              • Link LED: (4) LEDs (1per channel)
              • Power LED: (4) LEDs (1 per channel)
              • Null Test Button: (4)Buttons (1 per channel)
              • Receive Level Adjust: (4) In controls (1 perchannel)
              • Transmit Level Adjust: (4) Out controls (1 per channel)
              • NullingAdjust: (12) Null controls (3 per channel)
              • Channel Link Switch: (3) Link switches (A+B, A+C, A+D)
            • Environmental: 32 - 122°F
            • Dimensions (W x H x D): 19" x 1.75" x 7.75"
            • Weight: 5.83 lbs

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