Clear-Com HB-702, HB-704 Datasheet

The HB-702 is a two-channel-selectable, full-duplex headset
station, able to be mounted into a wall or other surface. The HB-704
is identical, but can access four channels of intercom. These head­set stations are ideal for installation in theatrical, performance,
broadcast, and industrial facilities – wherever a multi-channel,
full-duplex headset communications panel is desired.

Both units mount 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 on the HB-702, and a four-position switch on the HB-704,
allow 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.

www.clearcom.com

Either of the stations 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 and HB-704 are
housed in a durable package with a steel
front panel.

Features:

• Selectable two- or four-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

Clear-Com Encore

TM

HB-702-704 Wall-Mount Remote Intercom Stations

HB-702

HB-704

Dimensional Drawings

www.clearcom.com

Americas & Asia 850 Marina Village Parkway, Alameda, CA 94501 USA Tel: [phone]
Europe, Middle East & Africa 7400 Beach Drive, Cambridge Research Park, Cambridge, UK Tel: [phone]

© 2007, Vitec Group Communications, LLC. All rights reserved. ® Clear-Com is a registered trade mark of The Vitec Group plc.

Clear-Com Encore

TM

HB-702-704 Wall-Mount Remote Intercom Stations

HB-702 FRONT VIEW HB-702 SIDE VIEW

Technical Specifications:

dBu is an absolute measurement. 0 dBu is
referenced to 0.775 volts RMS

Headset Microphone Input

Input Type : Dynamic
Input Impedance: >= 1KΩ
Mic Limiter Threshold: -2dBu ± 3dB
Mic Limiter Range: >= 15dB

Program Line Input

Input Impedance: >= 5KΩ

Headset Output

Load Impedance: >= 8Ω
Output Impedance: <= 25Ω
Output Limiter Threshold: +5dBu ± 3dB
Maximum Output Level
before Distortion: >= 17dBu

Party Line Output

Off Noise: < -74dBu
Output Impedance: >10KΩ

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
(HB-702/HB-704): 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 (0 - 50˚C)

Dimensions (HB-702/HB-704)

4.625 in. W x 4.5 in. H x 1.75 in. D
(117 mm x 114 mm x 44 mm)

Weight

0.46 lbs. (0.21 Kg)

Notice About Specifications

While Clear-Com makes every attempt to maintain the
accuracy of the information contained in its product
manuals, that information is subject to change without
notice. Performance specifications included in this manual
are design-center specifications and are included for
customer guidance and to facilitate system installation.
Actual operating performance may vary.

1.25 *
(32)

* 1.75" with

option modules

(13)

4.50

(114)

.5

4.50

3.25

(114)

(83)

1.81
(46)

4.63

(117)