BATTERY-POWERED EMERGENCY HANDSETS

The Vitavox Emergency Handset can be significantly enhanced to meet user requirements. Multiple emergency handsets can form a stand alone, non-interfering communication channel and can be configured for different purposes. Up to 30 handsets can be connected on one emergency circuit. The handsets are hard wired through standard two-wire copper cable. As these units are hard wired there is no signal barrier caused by bulkheads and other metalwork.

The system created is called ‘emergency’ because it has no requirement for power from any of the vessels systems. All power is provided by PP3 9V batteries included in each handset. If a ship, submarine or boat has lost main communications through power failure the emergency systems based on these handsets will still operate. The handsets are used to provide direct communication between strategic positions and can also be used where lines are not already wired, for field use on 'on the fly' communication.

Many ships use these as alternative communication channels, avoiding clogging the main broadcast communication system. Each handset has approximately twelve hours of constant use which includes a battery indicator diode. During speech operation the call-tone is locked out and under normal circumstances, all users can listen to those that are speaking on the connected circuit. Operators who wish to speak press their ‘Press to talk’ switch.

Specifications:

Microphone Inset
Input Impedance :	300ohms
Frequency Resp:	200Hz to 3.4kHz
Sensitivity:	-80dB re 1V/0.1M/m²
Receiver Inset
Input Impedance	300ohms
Frequency Resp:	200Hz to 3.3kHz
Sensitivity:	45dB above 0.1N/m²/mW
Call tone noise:	80 phons at 1.8m
Dimensions:	230 x 57 x 90mm
Weight:	380g
Earphone output:	12 chained 115dB(A), 24 108dB(A), 30 105dB(A)