• For optimum reception, always align the antennas vertically. Suitable cable types and corresponding amplification settings Depending on the cable length, you have to adjust the amplification using the selector (see diagram on page 2). Amplification setting for RG 58 cable / GZL 1019 b 5 dB 10 dB 15 dB Amplification setting for RG 213 cable / GZL5000 b 5 dB 10 dB 15 dB Amplification setting for very low-attenuation 1/2 " cable b 5 dB 10 dB 15 dB 0 10 20 30 40 50 60 70 80 90 100110m 0 30 60 90

7 EK 3253 bodypack receiver ........................................................... 8 The operating controls ................................................................... 9 Indications and displays .............................................................. 10 The LC display .......................................................................... 10 Preparing the receiver for use .................................................... 13 Inserting and replacing the batteries ........

Merkmale • Vierstufig einstellbare Verstarkung bis 15 dB zum Ausgleich der Kabeldampfung • Spannungsversorgung uber den HF-Ausgang des Antennenverstarkers • Bypass bei Spannungsausfall • Gut sichtbare LED-Anzeige der Betriebszustande • Robustes, spritzwassergeschutztes Ganzmetallgehause • Einfache Montage am Stativ durch integrierte 3/8“ oder 5/8“ Gewinde Lieferumfang • Breitband-Antennenverstarker AB 3700 • Bedienungsanleitung • Einstellwerkzeug Ubersicht uber die Bedienelemente . LED Betriebs

self-adhesive piece of velcro . MZQ 2002-1 Supply schedule 1 HMEC 25-KA or HMEC 25-CA 1 Carrying case 1 wind-shield MZW 45 (Art.No 75823) 1 self-adhesive piece of velcro, fig. . 1 MZQ 2002-1 clip (Art.No 44740), fig. . 16 17 Technical data NoiseGard ™ HMEC 25-KA / -CA Headphone Transducer principle dynamic, open, supra-aural Frequency response 16 Hz - 22 kHz Impedance active/passive 200 . (mono) 400 . per side (stereo) same volume for active and passive THD < 1 % Compensation active and passive

With the NoiseGard ™ system, Sennheiser has come up with an effective solution. These operating instructions explain the NoiseGard ™ principle and show you how to use the NoiseGard ™ headset. Noise levels 140 dB Jet engine (at a distance of 25 m) 130 dB Aircraft engine (This is the treshold of pain) 120 dB Pneumatic drill 110 dB Blacksmith's hammer, concrete works 100 dB Die-cast machine 90 dB Metal workshop 80 dB Tractor 70 dB Office 60 dB Conversation 50 dB Ambient noise 40 dB Living room 30 d

No. 44740) HMEC 302, HMEC 305 and HMEC 306 headsets • Headset • Padded carry and storage bag with shoulder strap • Wind screen for microphone • MZQ 2002-1 Cable clip (Cat. No. 44740) Recommended accessories Replaceable gel ear cushions (Cat. No. 83140) BP-03 battery pack (except for HMEC 302, HMEC 305 and HMEC 306) Battery pack with XLR-3 socket for powering the NoiseGard™ electronics HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets. Four alkaline manganese batteries (IEC LR 6) ensure approx

Set the Mono/Stereo switch to ‘Stereo’. HMEC 306 and HMEC 306) You are receiving a mono source but the headset . Set the Mono/Stereo switch to ‘Mono’. Microphone output voltage set too high or too low Re-adjust the output voltage on the . To do so, use a small slotted screwdriver (see illustration on page 133) 137 Valuable information on NoiseGard™ The NoiseGard™ principle One of the greatest stress factors today is noise. Research has shown that noise the nervous system, and can cause tiredness

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 e

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 cushi

Connecting the headset to the on-board system The NoiseGard™ electronics can be connected to on-board power supply systems operating voltages between 12–35 V DC. Danger of short circuit! Before turning on NoiseGard™, ensure that the on-board power supply protected by a 1 A fuse. The HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC supplied with an XLR-3 socket for panel mounting in the be mounted by a technician qualified to perform this type HMEC 300 and HMEC 400 headsets: . Connect the 1/ 4”