Telex Airman ANR 500 User manual

Operating Instructions
Airman ANR™ 500 Headset
38110-014 Rev D 09/2010

2
Airman ANR™ 500 Headset
PROPRIETARY NOTICE
The product information and design disclosed herein were
originated by and are the property of Bosch Security
Systems, Inc. Bosch reserves all patent, proprietary
design, manufacturing, reproduction, use and sales rights
thereto, and to any article disclosed therein, except to the
extent rights are expressly granted to others.
COPYRIGHT NOTICE
Copyright 2010 by Bosch Security Systems, Inc. All
rights reserved. Reproduction, in whole or in part, without
prior written permission from Bosch is prohibited.
WARRANTY AND SERVICE INFORMATION
For warranty and service information, refer to the appro-
priate web site below:
Headsets................. www.intercomheadsets.com/warranty
RTS ................................ www.rtsintercoms.com/warranty
RTSTW...................................... www.rtstw.com/warranty
AudioCom ................. www.telexaudiocom.com/warranty
RadioCom................... www.telexradiocom.com/warranty
CUSTOMER SUPPORT
Technical questions should be directed to:
Customer Service Department
Bosch Security Systems, Inc.
Attn: Service
8601 E Cornhusker Hwy
Lincoln, NE 68507
800-898-6723

3
Airman ANR™ 500 Headset
NOTE: See page 11 for available
replacement parts.
FIGURE 1. Reference View

4
Airman ANR™ 500 Headset

Table
of
Contents
INTRODUCTION ......................................................................3
General Description ......................................................................... 3
Design Features (See Figure 1) ........................................................ 4
OPERATION .............................................................................5
Headset Operation ............................................................................ 5
Specifications ................................................................................. 10
Order Information .......................................................................... 11

3
CHAPTER 1
Introduction
General Description
The Telex Airman ANR™ 500 Active Noise Reduction headset combines design
features of a lightweight headset with the advanced techniques of electronic noise
reduction. The result is a comfortable light-weight headset that provides good
electronic reduction of high frequency ambient noise. To take advantage of this
improved listening environment, the Airman ANR™ 500 also features extended
response receivers for improved reproduction not only of radio communications, but
also of stereo music played back over the aircraft entertainment system.
The headset comes in a fixed-wing version for use in aircraft with medium to low
noise levels. This version can be plugged into an aircraft radio for standard monaural
communications or into an intercom system wired for stereo entertainment.
The Airman ANR™ 500 headset is approved for aircraft use under FAA TSO’s C57a
and C58a.

Introduction
4
Design Features (See Figure 1)
Fitting and Comfort
An adjustable ratcheted headband allows the wearer to make quick and easy
adjustments to fit a wide range of head sizes, while the gimbal mounted earcups
improve the headset comfort.
Control Module
The power on/off switch and the stereo/mono switch are both located on the control
module. The control module can be clipped to a shirt collar or pocket, using the
clothing clip.
Boom Microphone
A flexible gooseneck boom permits precise microphone placement. The boom rotates
120° to use the microphone on either side of the head. The microphone features a
noise-canceling electret element. The microphone amplifier is built into the headset
and operates on power supplied by the aircraft radio. The microphone amplifier has
an adjustable gain control to provide an output level equivalent to carbon microphone
levels. (Adjustment by a qualified avionics technician is recommended.)
Cordage and Plugs
The microphone cordage is protected inside the boom arm. Shielded wire throughout
the headset protects against RFI and EMI. Strain reliefs on all cords provide
maximum durability.

5
CHAPTER 1
Operation
Headset Operation
1. Connect the headset as shown in Figure 1.
2. Rotate the entire boom to wear the microphone on either the right or left
side of the head.
3. With the Airman ANR™ 500 headband resting securely on the top of the
head, check the earcups are centered over the ears. Proper performance
depends on proper fit of the headset.
4. For best noise canceling, position the microphone as close to the mouth as
possible with the hole in the microphone housing pointing directly at the
mouth and speak in a normal voice. (See Figure 2)
5. Select stereo operation if the headset is plugged into an aircraft intercom
system that is wired for stereo, otherwise select mono operation.

Operation
6
FIGURE 1. Connections
FIGURE 2. Microphone Placement

Operation
7
Microphone Gain Adjustment
The microphone gain has been factory-adjusted to the nominal level required for
normal radio operation and should normally not require adjustment. If needed,
adjustment by a qualified avionics technician is recommended. To access the
microphone gain, insert a small phillips head screwdriver through the access hole in
the headset (see Figure 3) Clockwise rotation increases the microphone gain.
NOTE: The microphone gain adjustment does not have a stop; at one point the
gain will go abruptly from maximum to minimum and will remain at
minimum gain for approximately 30° of rotation.
Microphone Bias Voltage Requirements
The boom microphone requires a bias voltage of 8-16VDC through 170ΩDC
resistance, 150ΩAC resistance (per RTCA DO-170). If you are uncertain whether
your avionics equipment meets this requirement, consult the avionics equipment
manufacturer.
FIGURE 3. Microphone Gain Adjustment

Operation
8
Module Battery Installation
The battery module requires one (1) 9-volt battery. Alkaline batteries are
recommended for best performance. Do not use nickel-cadmium rechargeable
batteries or lithium batteries.
1. To remove the battery door press down on the detente while sliding the bat-
tery door over in the direction of the arrow, then lift up.
2. Install the battery, as shown.
The unit will not operate properly if the battery is installed incorrectly.
3. Replace the battery door.
NOTE:
•Avoid unplugging the headset while noise reduction is turned
on, as this could cause a loud popping sound in the ears.
•If the batteries are low, the red LED lights on the battery
module. Replace batteries as soon as possible to ensure
continued ANR™ 500 operation.
•If the ANR operation shuts down due to low batteries, the
Airman ANR™ 500 functions as a conventional headset.
FIGURE 4. Battery Installation

Operation
9
Optional Aircraft Power Supply Module
The power supply module is designed for use in negative ground electrical systems
only. Do not attempt to use with positive-ground electrical systems.
FIGURE 5. Power Supply Module

Operation
10
Specifications
Receivers
Type: Dynamic
Frequency Response:±6dB re 1000Hz over the range 350-3000Hz
Sensitivity: 90±5dB SPL (1kHz, 1mW input per earcup side)
Impedance: 300Ωstereo or 150Ωmonaural mode
Stereo/Mono:
Switch located on the control module, allows stereo or monaural headset
operation.
Microphone/Amplifier Assembly
Element Type: Noise-canceling electret
Frequency Response: 300 to 5kHz
Sensitivity:
-51±3dB (ref. 1V/μbar at 1kHz with 12VDC and 470ΩDC load 150ΩAC
load
Matching Impedance: 50-600 Ohms
Gain Adjustment Range: ±5dB (clockwise rotation increases gain)
Operating Voltage (supplied by aircraft): 8-16 Volts DC
Microphone Interface:
Operates from a typical aircraft radio per RTCA DO-170; 8 to 16 Volts DC
with 470 Ohms DC resistance, 150 Ohms AC resistance
Power
Switch: On/Off switch on control module
Batteries: One (1) 9V alkaline battery installed in the battery module ANR
Battery Life: Operates 40 hours continuous until the red low battery light
turns on. At that point 4 to 8 hours of ANR operation remains.
Fail-Safe Mode
If battery power is too low for normal ANR operation or if the power switch
is in the off position, communications input is automatically routed to the
headset receivers.
General
Cordage
Straight cord from headset to battery module, 5.5ft (66”)
Radio Connections
Receiver; ¼” diameter stereo plug

Operation
11
Order Information
Headset with Battery Box........................................................................... 300735-002
Microphone Windscreen............................................................................... 59688-000
Headband Pad............................................................................................. 590561-002
Ear Cushions (set of two) ........................................................................... 590619-003
Model PT-300 Push-to-Talk Switch1............................................................ 63966-000
Zippered Pouch............................................................................................. 57893-000
Clothing Clip .............................................................................................. 590637-000
Battery Module........................................................................................... 590564-002
Aircraft Power Module................................................................................. 71046-002
Microphone: 0.206” diameter plug (PJ-068 equivalent)
Weights
Headset only: 7oz. (198g)
Battery module with battery: 17oz. (482g)
Color
Black
1. For aircraft without a push-to-talk switch, a portable push-to-talk switch must be used.

Bosch Security Systems, Inc.
12000 Portland Ave South
Burnsville, MN 55337 U.S.A.
www.boschcommunications.com