pilot headset, closed back headset, helicopters, propeller aircraft
General Description
Featuring excellent passive attenuation and a wide frequency response, this closed-back headset will make communications clear. The HME 120 is fitted with a volume control for the headphones; flexible, noise-compensated boom microphone for right or left-side use; and a cushioned, foldable headband. A high-quality bag is supplied with the unit.
Features
- Lightweight and comfortable
- Volume control
- MKE 45 flexible boom mic for right or left-side use
- Switchable mono/stereo
- Single-sided, round cable
- High-quality carrier bag
- Helicopter version for high impedance)
Delivery Includes
- HME 120 headset
- MKE 45-1 microphone
pilot headset, closed back headset, helicopters, propeller aircraft
Technical Data
| Attenuation (passive) |
> 10-40 dB |
| Connector |
U 174/U |
| Contact pressure |
Approx. 10 N |
| Ear coupling |
Around-the-ear |
| Frequency response (headphones) |
45-15,000 Hz |
| Frequency response (microphone) |
300-5,000 Hz |
| Max. sound pressure level (active) |
120 dB |
| Min. terminating impedance |
150 Ω |
| Nominal impedance |
150 Ω (mono), 300 Ω (stereo) |
| Operating voltage (mains) |
8-16 VDC, 8 -25 mA |
| Output voltage |
400 mV ± 3 dB @ 114 dB/SPL |
| Transducer principle |
Dynamic, closed back |
| Transducer principle |
Electret, noise-canceling |
Connector Image
pilot headset, closed back headset, helicopters, propeller aircraft
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Article No. |
pilot headset, closed back headset, helicopters, propeller aircraft
Variants
Glossary
| Attenuation (passive) |
| Reduction in ambient noise achieved by mechanical means, such as wearing headphones or ear defenders. |
| Connector |
| A standardised single or multi-pole plug for connecting units or accessories. |
| Contact pressure |
| The wearing comfort of a set of headphones is determined not only by its weight but also by the force with which the earpieces are pressed onto the ears. This force is given in newtons (N), whereby 1 N corresponds to the compressive force which a mass of about 100 g exerts on a solid surface. The DIN Standard 45500 Part 10 limits the maximum permissible contact force to 5 N. Values of between 1.3 and 4 N are common, although lower values apply for open headphones. Higher values can be found in the case of closed headphones. Here, a higher contact pressure is required in order to achieve sufficient sealing, which is important for the reproduction of low frequencies. |
| Ear coupling |
| A distinction is made between headphones which are worn on the external ear (supra-aural) and those which surround the ear (circumaural). Open headphones have foam ear pads that rest on the ears or ring pads that surround the ears. Closed headphones, on the other hand, nearly always have circumaural ear pads. |
| Frequency response (headphones) |
| The frequency response of a pair of headphones is given within limits defined by the manufacturer. |
| Frequency response (microphone) |
| The frequency response of a microphone is given within the limits defined by the manufacturer. In studio condenser microphones it is generally within the range of between 20 Hz and 20 kHz. |
| Min. terminating impedance |
| Impedance at which the connected unit meets the specified technical data. If the unit is connected to a lower impedance, it will usually have a lower output voltage or a greater distortion. |
| Nominal impedance |
| See impedance. |
| Operating voltage (mains) |
| Gives the (mains) voltage range for which a unit has been designed. |
| Output voltage |
| The (signal) voltage which a unit supplies at its output. |
| Transducer principle |
| Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way. |
| Transducer principle |
| Two transducer principles have become established for the conversion of electric energy into mechanical energy: electrodynamic and electrostatic transducers, whereby the latter is only to be found in audiophile systems, due to their relatively high manufacturing costs. Electrodynamic transducers basically consist of a ring-shaped permanent magnet and an oscillation coil, which is fixed to the receiver diaphragm. When an audio-frequency alternating current is passed through the oscillation coil, it is caused to vibrate in accordance with the audio-frequency alternating current, thus causing the diaphragm to vibrate in the same way. |
