Telex Headphones Stratus 50 User Manual

Telex  
User Instructions  
Stratus 50 Digital  
Active Noise Reduction Headset  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
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  
 
Notes  
Page 13  
 
LIT000010 Rev A  
04/2006  
 

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