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Instructions for use
Headset
HME 100
HME 105
HME 120
HMD 120
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Contents Safety tips ......................................................................................................27 Headset features ................................................................................................28 Product variants ......................................................................................................... 29 Delivery includes ................................................................................................31 Preparing the h
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The HME 100, HME 105, HME 120 and HMD 120 are pilot headsets with closed ear protector headphones for use in helicopters, propeller and turboprop aircraft. Safety tips • When using a headset, typical aircraft sounds (for example, those from engines, propellers, warning alarms, etc.) may sound different to you. Before operating any aircraft, make sure that, while wearing a headset, you can hear and recognize these sounds. Set the volume to safe levels that do not interfere with your ability to he
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Headset features HME 100 headset • New passive headset with excellent noise attenuation • Excellent comfort due to very low weight, soft ear cushions and padded headband as well as best possible freedom of movement due to unilateral connecting cable • Foldable headband for easy and space-saving storage • Clear communications due to MKE 45-1 electret microphone with adjustable sensitivity (sensitivity adjustment must be carried out by authorized personnel) • Microphone can be easily positioned an
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Product variants HME 105 headset The HME 105 differs from the HME 100 in the following features: • No Mono/Stereo switch • Connection of headphones and microphone via XLR-5 plug HME 120 headset The HME 120 differs from the HME 100 in the following features: • No Mono/Stereo switch • Coiled cable • Connection of headphones and microphone via U-174/U jack plug to a high impedance interface in the helicopter 29
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HMD 120 headset The HMD 120 differs from the HME 100 in the following features: • No Mono/Stereo switch • Coiled cable • M-87/AIC dynamic microphone and low impedance headphones • Connection of headphones and microphone via U-174/U jack plug to a low impedance interface in the helicopter 30
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Delivery includes HME 100, HME 105 and HME 120 headsets • Headset • Padded carry and storage bag with shoulder strap for headset and accessories • Wind screen for microphone • Cable clip MZQ 2002-1 (Cat. No. 4470) HMD 120 headset • Headset • Padded carry and storage bag with shoulder strap for headset and accessories • Cable clip MZQ 2002-1 (Cat. No. 4470) Recommended Accessories • Replaceable gel ear cushions (Cat. No. 83140) 31
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Preparing the headsets for use Connecting the headsets HME 100 headset: 1 1 / ” (6.35 mm) stereo jack plug for connecting the headphones 4 1 PJ-068 jack plug for connecting the microphone 1 Connect the / ” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack 4 Connecting cable for HME 100 plug for the microphone to the corresponding jack sockets of your intercom. HME 105 headset: 1 XLR-5 plug for connecting the headphones and the microphone Connect the XLR-5 plug for the headpho
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HME 120 and HMD 120 headsets: 1 U-174/U jack plug for connecting the headphones and the microphone Connect the U-174/U jack plug for the headphones and the microphone to the U-174/U socket of your intercom. Connecting cable for HME 120 and HMD 120 33
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Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: Wear the headset so that the headband runs over the top of your head. Adjust the length of the headband so that • your ears are completely inside the ear cushions, • you feel even, gentle pressure around your ears, • a snug fit is ensured. Note: Make sure not to squeeze any connecting cable when adjusting the headband. Squeezing can damage the connecting cab
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Positioning the microphone Relocating the microphone boom The microphone boom can be worn on either side of the mouth. Loosen the quick-fixing device. Rotate the microphone boom by 180°. Tighten the quick-fixing device. Positioning the microphone towards the corner of the mouth The HME 100, HME 105 and HME 120 headsets feature a flexible microphone boom. Bend the microphone boom so that the microphone is placed at the corner of the mouth. Maintain a distance of approx. 2 cm between microph
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For positioning the microphone of the HMD 120 headset, proceed as follows: Adjust the length of the microphone boom so that the microphone is placed at the corner of the mouth. To do so, loosen the quick-fixing device and adjust the microphone boom in length. Pull the middle part of the microphone boom towards the mouth so that the distance between microphone and mouth is approx. 2 cm. Tilt the microphone for final positioning. 36
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Using the headsets Mono/Stereo selection (HME 100 only) In general, you‘ll receive a mono sound source so that the Mono/Stereo switch can remain set to ‘Mono’. When using a stereo intercom system, set the headset to stereo operation. Remove the ear cushion ( ‘Replacing the ear cushions’) from the earcup with the micro- phone boom attached and set the Mono/Stereo switch to ‘Stereo’. Adjusting the volume Exposure to loud sounds can cause hearing damage! Set the volume control to a medium value. M
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Adjusting the microphone gain Mic Gain Adjustment According to JTSO approval C58a, the microphone output voltage is factory-preset to 400 mV. If the microphone output voltage is too high or too low for your intercom system, it can be re-adjusted on the microphone. To do so, use a small slotted screwdriver and turn the ‘Mic Gain Adjustment’ screw (see illustration on the left) until you have reached the desired setting. Folding up the headphones For easy and space-saving transportation, the earcu
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Additional information for helicopter use of the HME 120 headset The polarity of the microphone connection in helicopters is not standardized. If the microphone of your headset does not work with the existing polarity, you can reverse the polarity on the headset by simply rotating the microphone module. To do so, please proceed as follows: 1. Pull the wind screen from the microphone. 2. Loosen the screws by approx. half a turn. 3. Pull the microphone module from the boom-arm. 4. Rotate the micro
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Spare parts The following spare parts are available from your Sennheiser agent: • Wind screen for MKE 45-1 electret microphone • Cable clip • Carry and storage bag with shoulder strap • Ear cushions Replacing the wind screen If the wind screen for the electret microphone shows signs of wear such as tears or holes, replace the wind screen. Pull the wind screen from the microphone. Gently slide-on the new wind screen and ensure that it fits securely over the microphone. Replacing the ear cushions
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Connector assignment 3 2 4 1 5 solder side 1 2 3 4 U174/U jack plug XLR-5 connector 1 Microphone Lo 1 Audio Hi 2 Audio Hi 2 Audio Lo 3 Microphone Hi 3 Microphone Hi 4 Audio Lo 4 Microphone Lo 5— 1 2 3 123 1 / ” (6.35 mm) stereo jack plug PJ-068 jack plug 4 1 Audio Hi left 1 Not assigned! 2 Audio Hi right 2 Microphone Hi 3 Audio Lo 3 Microphone Lo 41
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In case of difficulty If problems occur that are not listed in the below table, please contact your Sennheiser agent. Possible cause and what to do Problem Communications in one ear only You are using a stereo intercom system but the headset is set to mono operation. (HME 100 only) Set the Mono/Stereo switch to ‘Stereo’. You are receiving a mono source but the headset is set to stereo operation. Set the Mono/Stereo switch to ‘Mono’. Very low volume communication The volume control is set too
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Problem Possible cause and what to do Microphone output voltage too Re-adjust the output voltage on the microphone. high or too low To do so, use a small slotted screwdriver and turn the ‘Mic Gain Adjustment’ screw (see illustration on page 38) until you have reached the desired setting. 43
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Technical data HME 100 HME 105 and HME 120 HMD 120 Headphones Transducer principle dynamic Ear coupling circumaural, closed Frequency response 45–15,000 Hz Nominal impedance 150 , mono, 300 , stereo 150 , mono 16 , mono Attenuation > 10–40 dB Contact pressure approx. 10 N Microphone incl. preamplifier Transducer principle electret mic capsule, electret mic capsule, dynamic, noise-compensated noise-compensated noise-compensated MKE 45-1 MKE 45-1 M-87/AIC Frequency response 300–5,000 Hz
