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User Instructions
Stratus 50-D
Active Noise Reduction Headset
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Replaceable Wide Head Pad Detented Sliders Adjust to Any Size Head Earcups Pivot on Two Planes to Conform to Patented Wearer Tension Adjust Knob (Comfort tm Cam ) Flexible Boom Permits Precise Mic Placement Replaceable Ear Cushions Noise Canceling Patented Ball and Socket Electret Microphone Jointed Boom Rotates Overhead for Mic Placement on Either Side of Head Figure 1 Stratus Reference View
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General Description The Telex Stratus 50-D is a medium-weight, active noise-reduction headset with an amplified, noise-canceling, electret microphone. It provides up to 25+dB digital tonal noise reduction of engine and blade noise, up to 15+dB of analog broadband noise reduction, and 29+dB of passive noise reduction. At 90 Hz the accumulative total is 50+dB of noise reduction. This device complies with part 15 of the FCC Rules, Operation is subject to the following two conditions: (1) This dev
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Microphone Bias Voltage Requirements The boom microphone operates on a voltage of 8-16 VDC. Output voltage is 50 ohms (Designed for radio input impedances from 50-600 ohms). If you are uncertain whether your avionics equipment meets this requirement, consult the avionics equipment manufacturer. Headset Power The headset will operate with either 4 AA batteries or panel power from 8- 32 Vdc. Panel Power Option An optional power cord is provided for use in negative ground electrical systems only.
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Headset Operation 1. Connect the headset as shown in Figure 4. Set the MONO/STEREO headphone switch to match the type of sound system in your aircraft. If the headset is set for stereo and the intercom is set for mono, sound will only come out of one earcup. Figure 4 Headset Connections 2. Rotate the entire boom overhead to wear the microphone on either the right or left side of the head (See Figure 5). Figure 5 Microphone Placement 3. Reshape the boom so that the microphone will be in front o
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Headset Operation (Cont.) 6. With the headband resting securely on the top of the head, check that the ear cups are centered over the ears. Reposition them if necessary by moving the headband sliders up or down (See Figure 9 on the next page). Proper performance depends on proper fit of the headset as described below. 7. Headband Pressure Adjustments: There are three pressure settings. Increasing the pressure will improve the seal between the earcup and the head for greater noise reduction. To c
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Headset Operation (Cont.) 8. Headband Size Adjustment To adjust the headband size, move the earcup sliders up or down on the headband (Figure 9). Size is properly adjusted when the earcups are centered over the ears. It is important to adjust both sides of the headband the same to keep the headband and pad properly centered over the head. Figure 9 Headband Size Adjustment 9. Volume Adjustment When the microphone is worn on the left side, volume is increased by rotating the top of the volume cont
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Stratus Controls Power Switch the ON/OFF button to turn the Stratus on or off. Green LED indicates power on. Low Battery Red LED indicates 20% or less battery life remaining. Figure 11 Stratus DSP Controller Microphone Gain Adjustment The microphone gain has been factory-adjusted to the nominal level required for FAA certification, and it should normally not require readjustment. Any changes to the mic gain should be done by a qualified avionics technician. To access the gain trimmer, insert a
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Ear Cushion Replacement To remove an old ear cushion, simply grasp it and pull it off the earcup. To install a new ear cushion, start at the top of the earcup. Place the flap on the back of the ear cushion over the lip along the top of the earcup. Then, pull the bottom of the ear cushion down over the lip at the bottom of the earcup. Wiring Diagram .206 DIA. MICROPHONE PLUG MIC + RED MIC - BLK SHLD .250 DIA. SPEAKER PLUG RED SPKR - L BLUE SPKR - R BLK WHITE SHLD SPKR - GND Figure 13 Wiring Dia
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Specifications Receivers: Type: Dynamic Frequency Response: 50 Hz - 10 kHz Sensitivity: 95 ± 5 dB SPL (1 kHz, 1 mW input) Impedance (Max. Volume): Stereo.........................................300 ohms per side Monaural...................................................150 ohms Headset Power: 4AA Batteries or Panel Power from 8-32 Vdc Microphone and Amplifier: Element Type: Noise-canceling electret Frequency Response: 100 Hz - 3.5 kHz Sensitivity: -53 +2/-1 dB (ref:1 V/ µbar at 1 kHz with 12 Vd
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ORDERING INFORMATION Stratus Headset, with electret mic, battery module, and carrying case . ............................................. Catalog no. 301125-000 Aircraft Power Cord ............................................ Catalog no. 550216-001 1” Foam-filled ear cushions (package of 2) ......... Catalog no. 800456-015 Headband Pad.................................................... Catalog no. 800456-017 Replacement electret microphone ...................... C
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LIMITED WARRANTY — VALID ONLY IN UNITED STATES AND CANADA TELEX Communications, Inc. (“Telex”) warrants to the user, who originally purchased the product delivered with this card, that the product will be free from defects in material and workmanship for the following periods after such date of purchase: Material 36 months, workmanship 36 months. Telex will, at its option, repair or replace, free of charge, such defective products subject to the following conditions: 1. Delivery of the product o
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CUSTOMER SERVICE For information or technical assistance, call or write to Telex at: Customer Service Department Telex Communications, Inc. 12000 Portland Ave. So. Burnsville, MN 55337 U.S.A. (952) 884-4051 When returning equipment for repair, please enclose an explanation of the problem. And, if the equipment is covered under warranty, please enclose a copy of your proof of purchase. The equipment must be accompanied by documentation stating your name, return address, and telephone number. Retu
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Notes
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Notes
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38110-073 Rev D 7/02
