Clear-Com IF4W4

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.

Connections
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.

Features

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

Specifications

• Program Line Input
  Input Impedance : >= 1K ohm
• Party Line Output
  Output Impedance: >10K ohms
• Stage Announce/Balanced Line Out
  Type: Balanced
  Output Impedance: >= 80 ohms
  Load Impedance: >= 600 ohms
• 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%
• Noise
  Program Input - Party Line: < -85dBu
  Party Line - Line Out: < -60dBu
• Max Gain
  Program Input - Party Line: >= -16dB
  Party Line - Line Out: >= 24dB
• Min Gain
  Program Input - Party Line: <= -20dB
  Party Line - Line Out: <= -45dB
• 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-Wire Terminal Block Connectors: (4) Connectors (1 per channel) 4-Wire Transmit
  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 per channel)
  Red Level LED: (4) LEDs (1 per channel)
  Link LED: (4) LEDs (1 per channel)
  Power LED: (4) LEDs (1 per channel)
  Null Test Button: (4) Buttons (1 per channel)
  Receive Level Adjust: (4) In controls (1 per channel)
  Transmit Level Adjust: (4) Out controls (1 per channel)
  Nulling Adjust: (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

TMGR# IF4W4