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Connect the XLR-3 plug of the headset connecting cable to the of the adapter cable. . Connect the plugor right-angled jack plug of the adapter cable to the cigarette lighter socket. Preparing the headsets for use Adjusting the headband For good noise attenuation and best possible comfort, the headband has to 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 Squeezing can damage the connecting cables. . Turn on the NoiseGard™ active noise compensation setting the ON/OFF switch to ON ( “Turning NoiseGard™ on/off”). . Final adjustment is best made in a 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 The HMEC 300, HMEC 302, HMEC 305, HMEC and HMEC 400 headsets feature a flexible microphone that the microphone is placed at the 2 cm between microphone and mouth. For positioning the microphone of the HMDC 322 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. Additional information for helicopter use of the HMEC 322 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 polarity on the headset by simply rotating the microphone module. To do so, 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 microphone module by 180° . 5. Put the rotated microphone module back into the boom-6. Now tighten the screws from the other side. 7. Slide the windscreen over the microphone. Rotating the microphone module does compensating pick-up pattern, the Using the headsets Turning NoiseGard™ on/off With the NoiseGard™ active noise compensation turned off, the headset can a conventional headset. Turn on the NoiseGard™ active noise compensation by setting the ON/to ON. When using the BP-03 battery pack, set the NoiseGard™ ON/OFF switch to ON and use the ON/OFF switch on the battery pack. Mono/Stereo selection (except HMEC 305, HMEC HMDC 322) In general, you’ll receive a mono sound source so set to “Mono”. When using a stereo intercom “Stereo”. Adjusting the volume Exposure to loud sounds can Set the volume control to a medium value. Make such as warning alarms. Mic Gain Adjustment Adjusting the microphone gain According to JTSO approval C58a, the microphone output voltage has to be factory-preset to 400 mV. If this output voltage is too high or too low for your intercom it can...

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