Telex Stratus 50 User Manual
Telex
®
User Instructions
Stratus 50 Digital
Active Noise Reduction Headset
The Stratus 50 Digital provides the best noise reduction available on the market.
Detented Sliders
Adjust to
Any Size Head
Patented
Tension
Adjust Knob
(Comfort
Camtm)
Replaceable
Wide Head Pad
Earcups Pivot on
Two Planes to
Conform to
Wearer
Ball and Socket
Jointed Boom Rotates
Overhead for Mic
Placement on Either
Side of Head
Flexible Boom Permits
Precise Mic Placement
Figure 1
Stratus 50 Digital Reference View
This device complies with part 15 of the FCC Rules,
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference,
and (2) this device must accept any interference received, including interference that may cause undesired operation.
Replaceable
Ear Cushions
Noise Canceling
Electret Microphone
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.
tm
To adjust ear cup pressure, a patented “Comfort Cam
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/copilot 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.
” is rotated to one of three
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 interface. 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-configuring 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.
www.telex.com/aircraft
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.)
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