Most of the problems that arise during the ground-ground, ground-board and board-ground communications, onboard or in proximity of aircrafts with engines or rotors running, are related with the high-level noise operative conditions and the consequent difficulties to understand the communications and to sustain the noise levels.
These problems make the working environment not easily sustainable, and can
compromise the hearings of the personnel (bringing them to deafness),
reduce the attention during the job operations
reduce the number of operative consecutive hours. To solve all these problems, and consequently to
Improve the speech intelligibility and, in general, the understanding of the communications,
Reduce the noise level perceived by the operator,
Improve the number of consecutive working hours (less noise means less stress and an improved working sustainability),
Making the working environment more sustainable and healthy, reducing the acoustic damages,
GEMELLI introduced a line of passive headsets based on new construction technologies for better improve the noise protection and the protection device performances.
HEADSET CHARACTERISTICS
The GEMELLI passive headset has the following main characteristics:
Compatibility with both high impedance and low impedance systems;
Dynamic or electrect microphones availability;
Flexible microphone arm for a better adjustment of the microphone;
Audio volume adjustment;
High performances loudspeakers;
Capability of reducing external noises (high performances with external noises up to 130 dB);
ETSO certifiable.
ANNEX 1 - TECHNICAL CHARACTERISTICS
CHARACTERISTIC VALUE
Frequency response ± 6 dB in the interval 350 Hz - 3 kHz
Distortion < 5 %
Loudspeaker Impedance within 8 ? and 16 ? at 1 kHz (low impedance)
within 150 ? and 600 ? at 1 kHz (high impedance)
Microphone types
electret Input impedance: 150 O (nominal)
Input sensitivity: 20 mV to 1.5 V
Power supply: 9 Vdc (nominal)
dynamic Input impedance: 5 O (nominal)
Input sensitivity: equivalent to M-87/M-101
Total weight Less than 700 g
ANNEX 2 - ENVIRonMENTAL CHARACTERISTICS
ENVIRonMENTAL ConDITION VALUE
Storage temperature range -55 °C to +85 °C
Operative temperature range -40 °C to +70 °C
Operating altitude 25000 ft
Relative Humidity 30% 90%
