Stereo Infrared Headset System (SIHS  2000NG) Communications, Passenger Address and Entertainment


The SIHS 2000 NG is a cordless infrared headset for communication. Designed for fixed and rotary wing aircraft with the purpose of overcoming reported information with current public address systems in general, and to add a safety feature in particular as it removes the potential hazards that may be encountered by passengers while evacuating in an emergency.

 

The system consists of a control unit, charging station, transmitters and headsets.

 

The control unit receives audio signals from the aircraft PA, intercommunication and entertainment systems and transmits them to passenger headsets via a number of transmitters suitably mounted within the cabin. The control unit receives and processes audio inputs which can be selected externally as required.

 

The transmitters are lightweight devices similar in shape and dimension to passenger reading lights and consist of diodes, which emit infrared signals.


Equipment specification:

Infrared control unit P/N 2003-2NG


Power requirements: 28 VDC nominal

 

Voltage supply variation: 24 to 35 VDC

 

Power consumption: 200 mA standby,
4.5 Amp max. with 10 transmitters in each section

 

Audio frequency range: 20 Hz to 20 kHz

 

Input:

  • Up to 3 independent entertainment inputs
  • 2 PA inputs (pilot, copilot)
  • 1 intercom input (flight attendant station or aircraft intercom system)

 

Input audio level: 300 mV to 10 VRMS

 

Input audio impedance: 600 Ω

 

Modulation: FM

 

Carrier frequency channel 1: 2.3 MHz

 

Carrier frequency channel 2: 2.8 MHz

 

Distortion: at 1 kHz, less than 1%

 

Weight: 750 g


Infrared transmitter P/N 2002-3NG

Control Transmitter Headset Charging


Power requirements: 28 VDC (supplied by control-unit)

 

Supply voltage variation: 24 to 33 VDC

 

Power consumption: 120 mA

 

Infrared wavelength: 950 nm

 

Radiation angle: 120°

 

Weight: 150 g


Stereo infrared headset P/N 2010-2NG


Frequency response: 20 Hz to 18 kHz

 

Power requirements: 3.6 VDC (rechargeable battery pack)

 

Distortion: at 1 kHz, less than 1%

 

Modulation: FM

 

Max volume: 110 dB

 

Battery type: NiMh

 

Battery capacity: 900 mAh

 

Battery voltage: 3.6 VDC

 

Operating time: more than 15 h

 

Weight: ≈ 400 g


Automatic charging station P/N 2002-4NG


Power requirements: 230 VAC / 50 Hz, 450 W

 

Standard charge current: 200 mA (each headset)

 

Trickle charge current: 25 mA (each headset)

 

Output: for 20 headsets