User Instructions

Stratus Heli-XT

Active Noise Reduction Headset

LIT000293000 Rev B 12/2008

Noise Reduction Passive noise reduction: >29dB

Active noise reduction: up to 16dB

Fit and Comfort Detented slide adjustment on the headband allows the ear cup to be easily raised or lowered for proper fit. Yoke design allows the ear cup to pivot in two planes assuring proper seal to the head and distributing ear cushion pressure evenly over its entire surface. Adjust ear cup pressure by rotating the patented

“Comfort Cam™” to one of three(3) tension settings.

1” thick ear cushion made from heat sensitive slow recovery foams Conforms to your head to provide a perfect seal while spreading the weight over a large area eliminating pressure points.

Boom

Microphone

Cordage and

Plugs

Amplified electret noise-canceling microphone prevents unwanted cabin noise from entering the communication system.

Boom rotates up to allow the boom to be worn on the left or right side. Retaining hooks are designed into the microphone housing to securely hold the windscreen in place and prevent it from slipping off.

All cables are shielded to protect against RFI (Radio Frequency

Interference). Strain relief is added to all cord entry points to provide protection from tugging resulting from normal usage.

Bend relief is added at high-flex cord entry points to protect cords from breakage due to bending.

•

Cable with 2.5mm plugs is provided for interfacing to a cellular telephone.

•

Cable with 3.5mm plugs is provided for interfacing to a portable music device, such as a CD player or MP3 player.

Cigarette lighter adapter is provided to power the headset off of aircraft power and to recharge the batteries.

AC wall adapter is provided to recharge the batteries when user is away from the aircraft.

Introduction 5

Auto Shut-Off

Headset will shut off automatically after 15 minutes in low-noise environments.

When Auto Shut-off is enabled, audio signals that keeps the headset active are:

•

communication over the aircraft radio/intercom system

•

cellular phone conversations

•

listening to music

•

cabin noise greater than 90dB SPL

Battery/User Interface Module

Puts most commonly used controls at the pilot’s fingertips. Cell phone jack for communication on your cell phone using the headset microphone and speakers.

Auxiliary input jack for listening to portable CD and MP3 players using the headset speakers. Power ON/OFF button turns ON and OFF all function to and from the headset except for to and from the radio/intercom system. Accessory mute button quickly and completely disables the cell phone and auxiliary audio devices, while maintaining radio/intercom communication. LED indicates power ON/OFF, accessory enabled/muted, low battery and battery charging. CD input jack to power the headset OFF of aircraft power and to recharge the batteries.

Electrical Requirements

Microphone Bias Voltage

8-16VDC. Output is designed for radio input impedances from 50-600 Ohms.

Headset Power

2AA Alkaline or NiMH batteries or panel power from 8-32VDC negative ground electrical systems.

6 Introduction

Wiring Diagram

FIGURE 2.

Wiring Diagram

Introduction 7

Specifications

Receivers

Type:

Dynamic

Frequency Response:

50Hz - 10kHz

Sensitivity:

95±5dB SPL (1kHz, 1mW input)

Impedance (Max. Volume):

Monaural, 150 Ohms

Headset Power:

2 - AA batteries or panel power from 8-32 Vdc

Microphone

Element Type:

Amplified noise-canceling electret

Frequency Response:

100Hz - 3.5kHz

Sensitivity:

-50 ±6dB (ref: 1V/ μbar at 1kHz with 12Vdc supply voltage and 470 Ohm DC, 150

Ohm AC load)

Matching Impedance:

50 - 600 Ohms

Gain Adjustment Range:

±5dB (clockwise rotation increases gain; counterclockwise rotation decreases gain)

Operating Voltage:

8-16Vdc (supplied by aircraft radio/intercom)

Cordage

Coiled Cord 8.5 ft. (2.6m) extended

Connectors

Microphone and Receiver Plug:

U174u equivalent TP120

2.5mm 3 conductor audio jack for connection to cell phone connection

3.5mm 3 conductor audio jack for connection to auxiliary audio

DC Jack:

1.3mm ID, 3.5mm OD, pin +

Weight

Effective Head Weight:

Color

Approximately 18.5oz. (524g)

Grey/Black

8 Introduction

CHAPTER 2

Operation

Headset Operation

Headband Size Adjustment

To adjust the headband size, do the following:

1.

With the headband resting securely on the top of the head, verify the ear

cups are centered over the ears.

Operation 9

2.

Reposition the ear cups, if necessary, by moving the headband sliders up or down.

FIGURE 1.

Headband Size Adjustment

Headband Pressure Adjustment

There are three(3) pressure settings. Increasing the pressure improves the seal between the ear cup and the head for greater noise reduction.

To change the pressure setting, do the following:

1.

2.

3.

Remove the headset and fold the ear cup inward.

Rotate the Comfort Cam™ to the desired setting.

Repeat for both ear cups.

NOTE: Both sides of the headband should be set to the same pressure setting to keep the headband properly centered on the head.

10 Operation

COMFORT CAM™ ADJUSTMENT SETTINGS

Side View

FIGURE 2.

Headband Pressure Adjustment

Top View

Operation 11

Noise Reduction Passive noise reduction: >29dB

Active noise reduction: up to 16dB

Fit and Comfort Detented slide adjustment on the headband allows the ear cup to be easily raised or lowered for proper fit. Yoke design allows the ear cup to pivot in two planes assuring proper seal to the head and distributing ear cushion pressure evenly over its entire surface. Adjust ear cup pressure by rotating the patented

“Comfort Cam™” to one of three(3) tension settings.

1” thick ear cushion made from heat sensitive slow recovery foams Conforms to your head to provide a perfect seal while spreading the weight over a large area eliminating pressure points.

Boom

Microphone

Cordage and

Plugs

Amplified electret noise-canceling microphone prevents unwanted cabin noise from entering the communication system.

Boom rotates up to allow the boom to be worn on the left or right side. Retaining hooks are designed into the microphone housing to securely hold the windscreen in place and prevent it from slipping off.

All cables are shielded to protect against RFI (Radio Frequency

Interference). Strain relief is added to all cord entry points to provide protection from tugging resulting from normal usage.

Bend relief is added at high-flex cord entry points to protect cords from breakage due to bending.

•

Cable with 2.5mm plugs is provided for interfacing to a cellular telephone.

•

Cable with 3.5mm plugs is provided for interfacing to a portable music device, such as a CD player or MP3 player.

Cigarette lighter adapter is provided to power the headset off of aircraft power and to recharge the batteries.

AC wall adapter is provided to recharge the batteries when user is away from the aircraft.

Introduction 5

Auto Shut-Off

Headset will shut off automatically after 15 minutes in low-noise environments.

When Auto Shut-off is enabled, audio signals that keeps the headset active are:

•

communication over the aircraft radio/intercom system

•

cellular phone conversations

•

listening to music

•

cabin noise greater than 90dB SPL

Battery/User Interface Module

Puts most commonly used controls at the pilot’s fingertips. Cell phone jack for communication on your cell phone using the headset microphone and speakers.

Auxiliary input jack for listening to portable CD and MP3 players using the headset speakers. Power ON/OFF button turns ON and OFF all function to and from the headset except for to and from the radio/intercom system. Accessory mute button quickly and completely disables the cell phone and auxiliary audio devices, while maintaining radio/intercom communication. LED indicates power ON/OFF, accessory enabled/muted, low battery and battery charging. CD input jack to power the headset OFF of aircraft power and to recharge the batteries.

Electrical Requirements

Microphone Bias Voltage

8-16VDC. Output is designed for radio input impedances from 50-600 Ohms.

Headset Power

2AA Alkaline or NiMH batteries or panel power from 8-32VDC negative ground electrical systems.

6 Introduction

Wiring Diagram

FIGURE 2.

Wiring Diagram

Introduction 7

Specifications

Receivers

Type:

Dynamic

Frequency Response:

50Hz - 10kHz

Sensitivity:

95±5dB SPL (1kHz, 1mW input)

Impedance (Max. Volume):

Monaural, 150 Ohms

Headset Power:

2 - AA batteries or panel power from 8-32 Vdc

Microphone

Element Type:

Amplified noise-canceling electret

Frequency Response:

100Hz - 3.5kHz

Sensitivity:

-50 ±6dB (ref: 1V/ μbar at 1kHz with 12Vdc supply voltage and 470 Ohm DC, 150

Ohm AC load)

Matching Impedance:

50 - 600 Ohms

Gain Adjustment Range:

±5dB (clockwise rotation increases gain; counterclockwise rotation decreases gain)

Operating Voltage:

8-16Vdc (supplied by aircraft radio/intercom)

Cordage

Coiled Cord 8.5 ft. (2.6m) extended

Connectors

Microphone and Receiver Plug:

U174u equivalent TP120

2.5mm 3 conductor audio jack for connection to cell phone connection

3.5mm 3 conductor audio jack for connection to auxiliary audio

DC Jack:

1.3mm ID, 3.5mm OD, pin +

Weight

Effective Head Weight:

Color

Approximately 18.5oz. (524g)

Grey/Black

8 Introduction

CHAPTER 2

Operation

Headset Operation

Headband Size Adjustment

To adjust the headband size, do the following:

1.

With the headband resting securely on the top of the head, verify the ear

cups are centered over the ears.

Operation 9

2.

Reposition the ear cups, if necessary, by moving the headband sliders up or down.

FIGURE 1.

Headband Size Adjustment

Headband Pressure Adjustment

There are three(3) pressure settings. Increasing the pressure improves the seal between the ear cup and the head for greater noise reduction.

To change the pressure setting, do the following:

1.

2.

3.

Remove the headset and fold the ear cup inward.

Rotate the Comfort Cam™ to the desired setting.

Repeat for both ear cups.

NOTE: Both sides of the headband should be set to the same pressure setting to keep the headband properly centered on the head.

10 Operation

COMFORT CAM™ ADJUSTMENT SETTINGS

Side View

FIGURE 2.

Headband Pressure Adjustment

Top View

Operation 11

Microphone Boom Rotation

To rotate the boom microphone, do the following:

>

Rotate the entire boom overhead to wear the microphone on either the right or left side of the head.

FIGURE 3.

Microphone Boom Rotation

Microphone Placement

To accurately place the microphone, do the following:

>

Reshape the boom so the microphone is in front of the mouth.

NOTE: To assure optimal performance, the user should position the microphone close to the lips as possible, near the corner of the mouth with the flat part of the microphone parallel to the user’s face. Speak in a normal voice.

12 Operation

FIGURE 4.

Mic Placement

Battery Installation

NOTE: Rechargeable NiMH Batteries supplied with the Stratus Heli-XT need to be fully charged before first use.

To install the batteries, do the following:

1.

2.

3.

Press the thumb-grip area of the battery cover and slide the battery cover down, and then lift off the cover.

Place the batteries into the battery compartment in the direction indicated.

Slide the battery cover back into place.

Accessory Connections

Connect cellular telephone and/or audio input devices, as desired.

The Telex Stratus Heli-XT 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 Heli-XT headset.

See the Telex website (www.telex.com/aircraft), for additional information.

Operation 13

Speaker 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. Volume control affects communications, as well as cell phone and auxiliary audio inputs.

FIGURE 5.

Volume Adjustment

Powering ON/OFF

To power the headset ON, do the following:

>

To turn the headset ON, press the ON/OFF button.

A blinking LED indicates the power is ON.

To power the headset OFF, do the following:

14 Operation

>

To turn the headset OFF, hold down the ON/OFF button until the LED blinks rapidly, and then let go.

The blinking LED stops when the unit is OFF.

Accessory Muting

To mute accessories, do the following:

>

To either enable or mute the accessories, press the accessory mute button.

When the accessories are muted, the LED blinks at a slower rate than when they are enabled.

Battery Charging

To charge the batteries, do the following:

>

Connect either the AC wall adapter or the aircraft cigarette lighter to the

DC input jack.

If the headset is OFF, the LED lights solid red during charging. If the unit is

ON and the batteries are charging, the LED will be mostly ON, but blink

OFF occasionally, as opposed to being mostly OFF but blinking ON occasionally when the batteries are not charging.

Disable Auto Shut-Off

To disable the auto shut-off feature, do the following:

1.

2.

3.

Remove the batteries from the unit (see “Battery Installation” on page 13).

Locate the DIP switch in the battery compartment.

Using a small, flat-blade screwdriver, set switch position 3 to the ON

position (away from the number 3.

Auto Shut-Off can be re-enabled by setting switch 3 to the OFF position

(toward the number 3).

Operation 15

Reading the LED Indicator

TABLE 1. LED Indicator Descriptions

Power OFF

Power ON/

Accessories

Enabled

Power ON/

Accessories

Muted

Battery

Normal

LED OFF

Blinks

Green every two (2) seconds

Blinks

Green every four (4) seconds

Battery Low

LED OFF

Blinks Red every two (2) seconds

Blinks Red every four (4) seconds

Battery Charging

LED Solid Red

Blinks OFF every two (2) seconds

Blinks OFF every four (4) seconds

Microphone Gain Adjustment

The microphone gain has been factory-adjusted to the nominal level required for aviation use, and should not require adjustment. Any changes to the microphone gain should be done by a qualified avionics technician.

To access the gain trimmer, do the following:

1.

2.

Insert a small, flat-blade screwdriver through the access hole in the microphone assembly.

Turn the gain pot clockwise to increase the gain.

OR

Turn the gain pot counterclockwise to decrease the gain.

16 Operation

FIGURE 6.

Microphone Gain Adjustment

Microphone Replacement

To replace the microphone, do the following:

1.

2.

On the boom assembly, press the release catch and carefully pull the microphone from the mic mount.

Be sure not to pull the connecting wires from the mic mount.

Detach the microphone from the connector.

FIGURE 7.

Mic Element Removal

Operation 17

3.

4.

Re-attach the new microphone to the connector.

Carefully rejoin the microphone and microphone mount, taking care not to fold the connecting wires.

Ear Cushion Replacement

To remove an old ear cushion, do the following:

>

Grasp the ear cushion and pull it off the ear cup.

To install a new ear cushion, do the following:

1.

2.

Starting at the top of the ear cup, place the back flap of the ear cushion over the top lip of the ear cup.

Pull the bottom of the ear cushion over the bottom lip of the ear cup.

18 Operation

Notes

Operation 19

TELEX COMMUNICATIONS, INC. • 12000 PORTLAND AVE S., BURNSVILLE, MN 55337 U.S.A