Telex ® User Instructions Echelon 25XT Noise Reduction Headset
Detented Sliders Adjust to Any Size Head Patented Tension Adjust Knob (Comfort Camtm) Replaceable Wide Head Pad Volume Earcups Pivot on Two Planes to Conform to Wearer Replaceable Ear Cushions Earcups Pivot on Two Planes to Conform to Wearer Boom Rotation for 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. Figure 1 Headband Size Adjustment Headband Pressure Adjustment There are three pressure settings for headband comfort.
Connection Connect the headset to the aircraft radio or intercom system as shown in Figure 4. Mute Switch To Radio Microphone “IN” Jack Cell Phone Jack Auxilary Jack To Radio Receiver “OUT” 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.
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. 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.
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.
TELEX COMMUNICATIONS, INC. - LIMITED WARRANTY Uniform Limited Warranty: 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.
CUSTOMER SERVICE For information or technical assistance, call, write, or email Telex at: Customer Service Department Telex Communications, Inc. 12000 Portland Ave. So. Burnsville, MN 55337 U.S.A. (952) 884-4051 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.
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LIT000014 Rev A 04/2006
