Telex Echelon 25XT User manual

User Instructions
Telex
®
Echelon 25XT
Noise Reduction Headset

Earcups Pivot
on Two Planes
to Conform to
Wearer
Replaceable
Wide Head Pad
Echelon 25XT Noise Reduction Headset
Volume
Detented Sliders
Adjust to
Any Size Head
Earcups Pivot on
Two Planes to
Conform to
Wearer
Patented
Tension
Adjust Knob
(Comfort
Cam
tm
)
Replaceable
Ear Cushions
Noise Canceling
Electret Microphone Flexible Boom
Permits Precise Mic
Placement
Boom Rotation for
Placement on Either
Side of Head

Page 1
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.
HIGH MEDIUM LOW
Comfort Cam™
ADJUSTMENT KNOB SETTINGS
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 SizeAdjustment
Figure 2
Headband PressureAdjustment
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.
Figure 3
Rotating and Reshaping the
Boom

Page 2
Connection
Connect the headset to the aircraft radio or intercom system as shown in
Figure 4.
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 theANR system while maintaining 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/aircraft
Auxilary Jack
Cell Phone Jack
Stereo/Mono Switch
Mute Switch
To Radio Microphone “IN” Jack
To Radio Receiver “OUT” Jack

Page 3
Figure 5
Mic GainAdjustment
Microphone Gain Adjustment
The microphone gain has been
factory-adjusted to the nominal
level required for aircraft use
and should normally not require
readjustment. Readjustment by
a qualified avionics technician is
recommended. To access the
gain trimmer, insert a small flat-
blade screwdriver through the
access hole in the mic element
(Figure 5). Clockwise rotation of
the trimmer increases gain.
MIC GAIN
ADJUSTMENT
ACCESS
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.
RELEASE CATCH
MIC ELEMENT
Figure 6
Mic Element Removal for
Replacement
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.
Volume 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.

Page 4
Specifications
Receivers
Type: Dynamic
Impedance:Accepts 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 Type: 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 Voltage: 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 5
TELEX COMMUNICATIONS, INC. - LIMITEDWARRANTY
Uniform LimitedWarranty: Telex brandedproducts arewarrantedbyTelex 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 specificitems described inthe individual productline 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 Telex Service Department 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 HEREINARE IN LIEU OF, AND EXCLUSIVE OF, ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED. SPECIFICALLY EXCLUDED, WITHOUT LIMITATION, ARE
THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR USE OR FORAPARTICULAR PURPOSE,
AND WARRANTIESARISING FROM COURSE OF DEALING OR USAGE OF TRADE ORANYOTHER
MATTER. IF, UNDERAPPLICABLE LAW, IMPLIED WARRANTIES MAYNOTBE VALIDLY EXCLUDED,
THE DURATION OF SUCH IMPLIED WARRANTIES IS LIMITED TO THE WARRANTY PERIOD.
Limitation of Remedies;Certain Damages Excluded: REPAIR OR REPLACEMENT OF DEFECTIVE
PRODUCTSARETHE SOLEANDEXCLUSIVE REMEDIESPROVIDED BYTELEX TOTHECUSTOMER
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 BYTHE CUSTOMER. TELEXAND ITS SUBSIDIARIES SHALL NOT BE LIABLE FORANY
INDIRECT, INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES INCLUDING,
WITHOUT LIMITATION, INJURY TO PERSONS OR PROPERTY OR LOSS OF USE. SOME STATES
AND COUNTRIES DO NOTALLOW THE EXCLUSION OR LIMITATION OF CERTAIN DAMAGES, SO
THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. IN SUCH STATES AND
COUNTRIES, TELEX SHALLBE LIABLE FOR NO MORE THANTHE DIRECT DAMAGES FOR BODILY
INJURYAND/OR REAL OR PERSONALPROPERTYARISING FROM THE NEGLIGENCE OF TELEX.
Other Rights: This warrantygives youspecific legalrights,and you may also have other rights, depending
upon where you live.
ObtainingWarranty Service:To obtain warranty service, a customer must deliver the product, prepaid,
to the appropriate Telex Service Department listed below or any of its 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 parties 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 theTelex Service Department listed
below:
USA, Canada, & Latin America
1720 E 14th Street
Glencoe, MN 55336
Tel: [phone]
Fax: [phone]

CUSTOMER SERVICE
For information or technical assistance, call, write, or email Telex at:
Customer Service Department
Telex Communications, Inc.
12000 PortlandAve. So.
Burnsville, MN 55337 U.S.A.
[phone]
www.telex.com/aircraft
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 repair costs
will be issued prior to service. Once you approve repair, and repair 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 RevA 04/2006