Telex
User Instructions
Stratus 50 Digital
Active Noise Reduction Headset
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General Description
The Telex Stratus 50 Digital is a medium-weight, active noise-reduction headset
with boom-mounted microphone. It provides up to 25+dB patented 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 - the best in the marketplace.
Design Features (See Figure 1)
Fit and Comfort
The Stratus 50 Digital incorporates unique features that allow the user to “custom
fit” the headset for comfortable operation. Among the features is a headband
design that distributes ear cushion pressure evenly over the entire ear with no
pressure points. A detented slide adjustment on the headband allows the ear
cup to be easily raised or lowered for proper fit. Contributing to the comfort fit is a
yoke design that allows the ear cup to pivot in two planes assuring proper
positioning on the head.
To adjust ear cup pressure, a patented “Comfort Camtm” is rotated to one of three
tension settings. The last component in the fit and comfort is the 1” cushion made from
heat sensitive slow recovery foam which will conform to your head to provide a perfect
seal while spreading the weight over a large area eliminating pressure points.
Boom Microphone
The Stratus 50-D utilizes an amplified electret noise-canceling microphone to
eliminate unwanted cabin noise from entering the communication system. To
assure proper operation the microphone must be positioned perpendicular to
the mouth close to the lips, slightly off center to the mouth. To facilitate pilot/co-
pilot wearing, the boom rotates up to allow the boom to be worn on the left or right
side. To minimize windscreen loss, “retaining hooks” are designed into the
microphone housing to securely hold the windscreen in place.
Cordage and Plugs
The Stratus 50-D uses shielded cables to protect against RFI (Radio Frequency
Interference) and EMF (Electro Magnetic Frequency). Strain relief is added to the
cords and plugs to provide protection from wear and tear resulting from normal
usage. The headset includes separate receiver and microphone plugs. The receiver
plug is set up for stereo usage but a switch on the cordage controls stereo/mono
operation.
A separate power cord is provided to allow aircraft power (via cigarette lighter
adapter) to plug into the battery module on the headset cord. This will accommodate
aircraft power from 8-32 Vdc.
Two cords for connecting cellular telephone and audio devices are included.
These cords are standard straight through types. The smaller of the two (2.5
mm connectors) is for connecting cellular telephones. The larger of the two (3.5
mm connectors) is for connecting audio devices.
Page 1
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Auto Shut-Off
The Stratus 50 Digital contains noise-sensing features to measure ambient noise
levels. When ambient noise levels are low for 5 to 7 minutes continuously, the
headset automatically shuts off. This feature will prolong battery life and prevent
discharge of batteries if the headset is accidentally left on after use.
Cellphone / audio interface
The Stratus 50 Digital includes a unique amplified interface allowing for the
connection of a cellular telephone and an audio input simultaneously. This
configuration allows the user to set up before take-off and eliminates the need
to re-configure cords and equipment when operating the aircraft.
The other unique feature of this interface is the ability to obtain power from the
aircraft’s communications system. This feature results in increased battery
life for the ANR system while maintaining the benefits of an amplified inter-
face. By amplifying the inputs, the Stratus 50 Digital allows the user to adjust
volume level at the headset contributing to the ability to not need re-configur-
ing while in flight.
The Telex Stratus 50 Digital cell phone / audio interface has been designed to
function with the widest array of cellular telephones and portable audio
devices. There are cell phones and audio devices on the market not designed
to industry physical and electrical standards. These devices are not
guaranteed to function properly with the Stratus 50 Digital headset.
Cell phone usage while in the air or under situations requiring full attention is
not recommended.
Please see the Telex web site for additional information.
Microphone Bias Voltage Requirements
The boom microphone operates on a voltage of 8-16 VDC. Output impedance 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.
The cellular telephone/auxiliary audio interface of the Stratus 50 Digital relies on
this same microphone bias voltage for operation. If less voltage/higher
impedance is normal in your system, this interface may not operate properly. If
unusual or unacceptable performance of the boom microphone or cellular/audio
interface is discovered, the cellular/audio interface should be disabled using
the accessory mute (described later in this manual.)
Page 2
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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. Do not attempt to use with positive ground electrical systems. The power
cord is designed to connect the battery module to the aircraft power via the
cigarette lighter jack.
Power Cord
450 Locking
Figure 2
Panel Power Option
Battery Power
The battery module requires 4 AA batteries. Alkaline batteries are recommended
for best performance. Do not use nickel-cadmium/NiMH rechargeable or lithium
batteries.
1. Slide the battery door down in the direction of the arrow, then up to
rotate the battery door (Figure 3).
2. Place the batteries into the battery module as shown.
3. Slide the battery door back into place.
Cellular telephone / auxiliary audio input – see above for details
Figure 3
Battery Installation
Headset Operation
1. Verify batteries are installed and headset powers on (see previous
section.) Connect panel power cord (if not using battery power.)
Page 3
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Headset Operation (cont.)
2. Connect the headset as shown in Figure 4. If using the standard
version, set the stereo/mono 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.
Mute Switch
To Radio Microphone “IN” Jack
Cell Phone Jack
Auxilary Jack
To Radio Receiver “OUT” Jack
Stereo/Mono Switch
Figure 4 Headset Connections
3. Connect cellular telephone and/or audio input devices as desired.
4. 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
5. Reshape the boom so that the microphone will be in front of
the mouth.
6. For best noise cancelation, position the microphone as close to the
mouth as possible and speak in a normal voice (Figure 7).
7. For mic replacement, press the release catch and carefully pull out
the mic element. Avoid pulling the connecting wires (Figure 6).
Figure 6
Figure 7
Mic Element Removal
Mic Placement
Page 4
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Headset Operation (cont.)
8. 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.
9. 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 change the pressure setting, remove the headset and fold the
earcup inward as shown in Figure 8, then rotate the Comfort Camtm to
the desired setting. Repeat for both earcups. Both sides of the
headband should be set to the same pressure setting to keep the
headband properly centered on the head.
Comfort Camtm Adjustment Settings
HIGH
MEDIUM
LOW
Side View
Top View
Figure 8
Headband Pressure Adjustment
Page 5
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Headset Operation (cont.)
10. 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 make
the same adjustments on both sides of the headband the same
to keep the headband and pad properly centered on the head.
Figure 9
Headband Size Adjustment
11. Volume Adjustment
When the microphone is worn on the
left side, volume is increased by
rotating the top of the volume controls
toward the front of the head. Control
operation is reversed when the
microphone is worn on the right side
(Figure 10).
Volume
Control
Volume control affects communications
as well as cellphone and auxiliary audio
inputs.
12. Accessory muting
The Stratus 50 Digital headset is
equipped with a switch to quickly and
completely disable the cellphone and
auxillary audio devices (Figure 4).
Figure 10
Volume Adjustment
Page 6
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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 percent or less battery life remaining.
Figure 11
Stratus Battery Box
Microphone Gain Adjustment
The microphone gain has been factory-adjusted to the nominal level required
for aviation use, 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 small flat-blade screwdriver through
the access hole in the mic assembly. Clockwise rotation of the trimmer
increases gain.
MIC GAIN
ADJUSTMENT
ACCESS
Figure 12
Microphone Gain Adjustment
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.
Page 7
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Wiring Diagram
.206 DIA. MICROPHONE PLUG
MIC +
MIC -
RED
BLK
SHLD
.250 DIA. SPEAKER PLUG
BLUE
SPKR - L
SPKR - R
W
H
ITE
SHLD
SPKR - GND
Figure 13
Standard Version
Page 8
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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:
Element Type: Amplified noise-canceling electret
Frequency Response: 100 Hz - 3.5 kHz
Sensitivity:
-50 ± 6 dB (ref: 1V/ µbar at 1 kHz with 12 Vdc
supply voltage and 470 ohm DC, 150 ohm AC load)
Matching Impedance:
50-600 ohms
Gain Adjustment Range: ± 5 dB (clockwise rotation increases gain)
Operating Voltage: 8-16 Vdc (supplied by aircraft radio)
Cordage:
Straight Y-cord, 9 ft (2.74 m)
Connectors:
Microphone Plug: PJ-068 or equivalent
Receiver Plug: PJ-055 or equivalent
DC Jack: 2.5mm Dia. Pin +
2.5mm 3 conductor audio jack for connection to cell phone connection
3.5mm 3 conductor audio jack for connection to auxiliary audio
Weight:
Effective Head Weight: Approximately 18.5 oz. (524 g)
Color: Dark Grey/Black
Page 9
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Ordering Information
Stratus Headset, with electret mic, battery module,
and carrying case (Dark Grey/Black)
Catalog no. PRD000010000
Aircraft Power Cord........................................................ Catalog no. 550216001
1” Foam-filled ear cushions (package of 2) ................. Catalog no. 800456021
Headband Pad .............................................................. Catalog no. 800456017
Replacement electret microphone ............................... Catalog no. 800136100
Microphone windscreen (electret) ................................ Catalog no. 800456000
Clothing Clip .................................................................. Catalog no. 590637000
Zippered Pouch ...................................................... Catalog no. CME000009000
Cell Phone Accessory Cable......................................... Catalog no. 550216002
Auxillary Device Accessory Cable.................................. Catalog no. 550216003
Page 10
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TELEX COMMUNICATIONS, INC. - LIMITED WARRANTY
Uniform Limited Warranty: Telex branded products are warranted by Telex Communications, Inc.
against malfunction due to defects in materials and workmanship for a specified period, as noted in the
individual product line statements below, beginning with the date of original purchase by the end-user.
If such malfunction occurs during the specified period, the product will be repaired with new or
remanufactured equivalent parts and products or replaced (at our option) without charge. The product
will be returned to the customer postage prepaid.
Exclusions and Limitations: The limited warranty does not apply to: (a) exterior finish or appearance;
(b) certain specific items described in the individual product line statements below, (c) malfunction
resulting from use or operation of the product other than as specified in the product data sheet or
owner’s manual; (d) malfunction resulting from misuse or abuse of the product, including accidents; (e)
defects resulting from excess moisture, lightning or power surges; or (f) malfunction occurring at any
time after repairs have been made to the product by anyone other than a Telex Service Department
employee or any of its authorized service representatives. The warranty is void if the label bearing the
product serial number (if applicable) has been removed or defaced.
Other Express or ImpliedWarranties Excluded: TO THE EXTENT PERMITTED BYAPPLICABLE LAW,
THE WARRANTIES SET FORTH HEREIN ARE IN LIEU OF, AND EXCLUSIVE OF, ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED. SPECIFICALLY EXCLUDED, WITHOUT LIMITATION, ARE
THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR USE OR FORAPARTICULAR PURPOSE,
AND WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE OR ANY
OTHER MATTER. IF, UNDER APPLICABLE LAW, IMPLIED WARRANTIES MAY NOT BE VALIDLY
EXCLUDED, THE DURATION OF SUCH IMPLIED WARRANTIES IS LIMITED TO THE WARRANTY
PERIOD.
Limitation of Remedies; Certain Damages Excluded: REPAIR OR REPLACEMENT OF DEFECTIVE
PRODUCTS ARE THE SOLE AND EXCLUSIVE REMEDIES PROVIDED BY TELEX TO THE CUSTOMER
OR TO ANY OTHER PERSON AND SHALL CONSTITUTE FULL SATISFACTION OF ALL CLAIMS,
WHETHER BASED ON CONTRACT, NEGLIGENCE, STRICT LIABILITY OR OTHERWISE. TELEX’s
MAXIMUM LIABILITY SHALL NOT EXCEED THEACTUAL PURCHASE PRICE PAID FOR THE PRODUCT
BY THE CUSTOMER. TELEX AND ITS SUBSIDIARIES SHALL NOT BE LIABLE FOR ANY INDIRECT,
INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES INCLUDING, WITHOUT
LIMITATION, INJURY TO PERSONS OR PROPERTY OR LOSS OF USE. SOME STATES AND
COUNTRIES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF CERTAIN DAMAGES, SO THE
ABOVE LIMITATION OR EXCLUSION MAY NOTAPPLYTO YOU. IN SUCH STATESAND COUNTRIES,
TELEX SHALL BE LIABLE FOR NO MORE THAN THE DIRECT DAMAGES FOR BODILY INJURY
AND/OR REAL OR PERSONAL PROPERTY ARISING FROM THE NEGLIGENCE OF TELEX.
Other Rights: This warranty gives you specific legal rights, and you may also have other rights,
depending upon where you live.
ObtainingWarranty Service: To obtain warranty service, a customer must deliver the product, prepaid,
to the appropriate Telex Service Department listed below or any of its authorized service representatives
together with proof of purchase of the product in the form of a bill of sale or invoice.
Applicable Law. The validity, performance and construction of this limited warranty shall be governed
by the laws of the State of Minnesota without reference to its choice of law principles. The Minnesota
federal courts and/or the state courts located in Hennepin County, Minnesota, shall have exclusive
personal and subject matter jurisdiction over, and the parties shall each submit to the jurisdiction of
such courts and to venue in Minnesota with respect to any dispute concerning the product or pursuant
to this limited warranty, and all objections to such jurisdiction or to such venue are hereby waived.
For additional warranty repair or service information, contact theTelex Service Department listed
below:
USA, Canada, & Latin America
1720 E 14th Street
Glencoe, MN 55336
Tel: 320-864-3177
Fax: 320-864-3225
Page 11
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CUSTOMER SERVICE
For information or technical assistance, call, write, or email Telex at:
Customer Service Department
Telex Communications, Inc.
12000 PortlandAve. 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.
Return equipment for factory repair to:
Customer Service Department
Telex Communications, Inc.
1720 East 14th St.
Glencoe, MN 55336 U.S.A.
(320) 864-3177
Warranty Repairs - If in warranty, no charge will be made for the repairs.
Equipment being returned for warranty repair must be sent prepaid and
will be returned prepaid.
Non-warranty Repairs - Equipment that is not under warranty must be
sent postage prepaid to Telex. If requested, an estimate of repair costs
will be issued prior to service. Once you approve repair, and repair of
equipment is completed, the equipment will be returned on a collect on
delivery basis. Collect charges may be avoided by sending a signed
check for payment in full along with your signed estimate approval form
(the estimate includes the shipping charge).
Telex Warranty Term Lengths
1
3
12
24
60
Other
Month Months Months Months Months
AVIATION
Stratus 50 Digital
X
Note: Subject to change without notice.
Page 12
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Notes
Page 13
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LIT000010 Rev A
04/2006
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