HB-704

Technical Specifications

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: 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
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)

Product Spares List

Product Spare Part	Spare Part Description
810351Z	HB-702/HB-704 MANUAL