Telex 25XT User Manual

Telex

®

User Instructions

Echelon 25XT
Noise Reduction Headset

Patented

Tension

Adjust Knob

(Comfort

Camtm)

Replaceable

Wide Head Pad

Detented Sliders

Adjust to

Any Size Head

Earcups Pivot

on Two Planes

to Conform to

Wearer

Volume

Replaceable

Ear Cushions

Boom Rotation for

Earcups Pivot on

Two Planes to

Conform to

Wearer

Placement on Either

Side of Head

Noise Canceling

Electret Microphone

Echelon 25XT Noise Reduction Headset

Flexible Boom

Permits Precise Mic

Placement

Headband Size Adjustment

To adjust the headband size, move the
earcup sliders up or down on the
headband. Size is properly adjusted
when the earcups are centered over the
ears. It is important to make the same
adjustments to both sides of the
headband to keep the headband and
pad properly centered over the head.

Headband Pressure Adjustment

There are three pressure settings for
headband comfort. 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, then rotate the
Comfort Cam adjustment knob 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.

Figure 1

Headband Size Adjustment

Comfort Cam™

ADJUSTMENT KNOB SETTINGS

HIGH MEDIUM LOW

Figure 2

Headband Pressure Adjustment

Left or Right Side Microphone Placement

1. Rotate the boom as shown.

2. Reshape the boom so that the
microphone will be at the
corner of the mouth.

Page 1

Figure 3

Rotating and Reshaping the
Boom

Connection

Connect the headset to the aircraft radio or intercom system as shown in
Figure 4.

To Radio Microphone “IN” Jack

To Radio Receiver “OUT” Jack

Mute Switch

Cell Phone Jack

Auxilary Jack

Stereo/Mono Switch

Figure 4

Echelon 25XT Connectors

Stereo Mono Switch

This switch is located on the Y-cord (Figure 4). Set the switch to stereo
for aircraft with a stereo intercom system. Set the switch to mono for
monaural intercom systems or for direct connection to the aircraft radio.

Cellphone/Audio Interface

The Echelon 25XT 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 possessive communications system. This feature
results in increased battery life for the ANR system while maint aining the
benefits of an amplified interface. By amplifying the inputs, the Echelon
25XT allows the user to adjust volume level at the headset contributing to
the ability to not need re-configuring while in flight.

The Telex Echelon 25XT 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 Echelon 25XT headset.

Please see the Telex web site for additional information.
www.telex.com/aircraf t

Page 2

V olume Adjustment

When the microphone is worn on the left side, volume is increased by
rotating the top of the volume controls clockwise. Control operation is
reversed when the microphone is worn on the right side.

Microphone Gain Adjustment

The microphone gain has been
factory-adjusted to the nominal
level required for aircraft use
and should normally not require

MIC GAIN

ADJUSTMENT

ACCESS

readjustment. Readjustment by
a qualified avionics technician is
recommended. To access the
gain trimmer, insert a small flat­blade screwdriver through the
access hole in the mic element
(Figure 5). Clockwise rotation of
the trimmer increases gain.

Figure 5

Mic 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.

Mic Element Removal

Press the release catch on the
microphone element, and
carefully pull out the element.
Avoid pulling the microphone
wires. Pull on the plastic
connector housing to unplug the
microphone element.

RELEASE CATCH

MIC ELEMENT

Figure 6

Mic Element Removal for
Replacement

Page 3

Specifications

Receivers

Type: Dynamic
Impedance: Accept s 150-600 ohm sources
Frequency Response: 350 Hz - 3.0 kHz ± 6dB
Sensitivity: 90 ±5 dB SPL for 1 mW, 1 kHz input
Maximum Power Input: 30 mW

Microphone/Amplifier Assembly

Microphone T ype: Noise-canceling electret condenser
Output Impedance: 50 ohms (designed for radio input impedances from
50-600 ohms)
Frequency Response: 100 Hz - 3.5 kHz
Sensitivity: -50 +/-6 dB (ref: 1V/ µbar)
Operating Volt age: 8-16 Vdc

Cords and Plugs

Cord: 5.5 ft (1.7 m) “Y” cord with stereo/mono selector switch
Receiver Plug: 1/4" stereo phone plug
Microphone Plug: PJ-068 equivalent

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Page 4

TELEX COMMUNICATIONS, INC. - LIMITED WARRANTY

Uniform Limited W arranty: 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 T elex Service Dep artment 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 Implied Warranties Excluded: TO THE EXTENT PERMITTED BY APPLICABLE
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 MERCHANT ABILITY, FITNESS FOR USE OR FOR A PA RTICULAR PURPOSE,
AND WARRANTIES ARISING FROM COURSE OF DEALING OR USAGE OF TRADE OR AN Y OTHER
MATTER. IF, UNDER APPLICABLE LAW , IMPLIED W ARRANTIES MA Y NOT BE V ALIDL Y EXCLUDED,
THE DURATION OF SUCH IMPLIED WARRANTIES IS LIMITED TO THE WARRANTY PERIOD.

Limitation of Remedies; Certain Damages Excluded: REP AIR 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 THE ACTUAL PURCHASE PRICE PAID FOR THE
PRODUCT BY THE CUSTOMER. TELEX AND ITS SUBSIDIARIES SHALL NOT BE LIABLE FOR AN Y
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 NOT APPLY TO YOU. IN SUCH STATES AND
COUNTRIES, TELEX SHALL BE LIABLE FOR NO MORE THAN THE DIRECT DAMAGES FOR BODIL Y
INJURY AND/OR REAL OR PERSONAL PROPERT Y 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.

Obtaining Warranty Service: To obtain warranty service, a customer must deliver the product, prepaid,
to the appropriate T elex Service Department listed below or any of it s 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 p arties 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 the T elex Service Department listed
below:

USA, Canada, & Latin America

1720 E 14

Glencoe, MN 55336

T el: 320-864-3177

Fax: [phone]

th

Street

Page 5

CUSTOMER SER VICE

For information or technical assistance, call, write, or email Telex at:

Customer Service Department
Telex Communications, Inc.
12000 Portland A ve. So.
Burnsville, MN 55337 U.S.A.
[phone]
www.telex.com/aircraf t

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.
[phone]

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 rep air costs
will be issued prior to service. Once you approve repair, and rep air 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).

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Notes

Notes

Notes

LIT000014 Rev A 04/2006