Clear-Com HB-702

The HB-702 is a two-channel-selectable, full-duplex headset station, able to be mounted into a wall or other surface. These head-set stations are ideal for installation in theatrical, performance, broadcast, and industrial facilities - wherever a multi-channel, full-duplex headset communications panel is desired.

The unit is mounts in a standard U.S. two-gang outlet box. The stations offer excellent speech intelligibility even in high noise environments. Microprocessor-controlled logic plus a set of internal and external controls allow the features of these stations to be tailored to the needs of the user. Electronic switching for the talk button, blue-color LED (on) or amber-color (off), permits momentary or latching operation. A Remote Mic Kill (RMK) signal on the intercom line will turn off the talk function if it is accidentally left on.

A red-color LED tracks the incoming call signal, so it can be used for visual cueing. An associated call button allows the user to place a call signal on the selected intercom line. The standard 4-pin XLR headset jack accommodates Clear-Com and compatible dynamic headsets. A sidetone level control adjusts the amount of the user's voice heard in the headset. An automatic limiter circuit adjusts and limits the microphone output to the intercom line. A two-position switch allows the user to select from the attached intercom channels. Connections to the intercom lines are made via a screw-terminal block, using standard two-wire shielded mic cable.

The station may be used with the optional TW (two channels on a single mic cable) daughter board. With the TW board, the stations become plug-in compatible with a Clear-Com TW system. The HB-702 may be used with the optional 4-wire board, which creates separate send and receive circuits so that the station may be attached to fiber-optic lines or other audio routing systems with 4-wire connections. The HB-702 is housed in a durable package with a steel front panel.

Features

• Selectable two-channel full-duplex communication
• Microprocessor controlled logic and switching
• Momentary/latching talk switch with LED
• Visual call signaling with bright LED indicator
• Headset connector with volume control and sidetone adjust
• Use with optional TW or 4-wire circuit boards
• Easy installation and connection

Specifications

• Headset Microphone Input
  Input Type : Dynamic
  Input Impedance: >= 1K ohm
  Mic Limiter Threshold: -2dBu ± 3dB
  Mic Limiter Range: >= 15dB
• Program Line Input
  Input Impedance: >= 5K ohms
• Headset Output
  Load Impedance: >= 8 ohms
  Output Impedance: <= 25 ohms
  Output Limiter Threshold: +5dBu ± 3dB
  Maximum Output Level before Distortion: >= 17dBu
• Party Line Output
  Off Noise: < -74dBu
  Output Impedance: >10K ohms
• Party Line Input
  Crosstalk: < -60dB
  Max level before Clipping: >= 12dBu
• Frequency Response
  Headset Mic - Party Line: 300 - 15KHz ± 3dB
  Party Line - Headset Out: 300 - 15KHz ± 3dB
• Max Distortion
  Headset Mic - Party Line: <= 0.5%
  Party Line - Headset Out: <= 0.2%
• Noise
  Headset Mic - Party Line: < -70dBu
• Max Gain
  Headset Mic - Party Line: 41dB ± 2dB
  Party Line - Headset Out: >= 34dB
• Power
  Input Voltage Range: 20-30 VDC
  Input Current (Idle): <= 50mA
  Input Current (Max): <=100mA
• Internal Adjustments and Connections
  Intercom Line: Seven terminal connector
  Option Switches: Two DIP switches
  Option Board Jumper: Two sets of options jumpers
• Front Panel Connectors
  Headset: (1) XLR-4M
• Front Panel Controls & Indicators
  (1) Sidetone control
  (1) Talk button
  (1) Call button
  (1) Channel select switch
  (1) Volume control
• Environmental: 32 - 122°F
• Dimensions (W x H x D): 4.625" x 4.5" x 1.75"
• Weight: 0.46 lbs

TMGR# HB-702