Telex STRATUS 50-D User Manual

®

Te l e x

User Instructions

Stratus 50-D
Active Noise Reduction Headset

Detented Sliders

Adjust to

Any Size Head

Patented

Tension

Adjust Knob

(Comfort

Camtm)

Replaceable

Ear Cushions

Replaceable

Wide Head Pad

Earcups Pivot on

Two Planes to

Conform to

Wearer

Flexible Boom Permits
Precise Mic Placement

Noise Canceling

Electret Microphone

Stratus Reference View

Patented Ball and Socket

Jointed Boom Rotates

Overhead for Mic

Placement on Either

Side of Head

Figure 1

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 device may not cause harm­ful interference, and (2) this device must accept
any interference received, including interference
that may cause undesired operation.

Design Features (See Figure 1)

Fit and Comfort

The Stratus 50-D 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 performance to 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 electric noise-canceling microphone to eliminate
unwanted cabin noise from entering the communication system. To assure
proper operation the mic 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, “teeth” are designed into the mic
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. Separate receiver and microphone plugs
are provided as standard. 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.

Page 1

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 8­32 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
rechargeable batteries 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.

Figure 3

Battery Installation

Page 2

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 of
the mouth.

4. For best noise cancellation, position the microphone as close to the
mouth as possible and speak in a normal voice (Figure 7).

5. For mic replacement, press the release catch and carefully pull out
the mic element. Avoid pulling the connecting wires (Figure 6).

Figure 6

Mic Element Removal

Page 3

Figure 7

Mic Placement