Telex Echelon 20 User Instructions
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Telex Echelon 20 User Instructions

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User Instructions
Echelon 20
Headset

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Summary of Contents for Telex Echelon 20

  • Page 1 Telex ® User Instructions Echelon 20 Headset...
  • Page 2 The Echelon 20 full cushion aviation headset offers comfort, excellent hearing protection and value. Unique Design Replaceable Head Pad Detented Sliders Adjust to Any Size Head Patented Tension Adjust Knob (Comfort Earcups Pivot on Two Planes to Conform to Wearer...

  • Page 3: General Description

    GENERAL DESCRIPTION The Telex Echelon 20 is a medium-weight noise-reduction headset with amplified, noise-canceling, electret microphone. DESIGN FEATURES (See Figure 1) Comfortable foam-filled headband pad and ear cushions. The headband pad evenly distributes the headset weight with no pressure points, for maximum wearer comfort.

  • Page 4: Operation

    OPERATION Headband Pressure Adjustments 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 adjustment knob to the desired setting.
  • Page 5 Microphone Gain Adjustment The microphone gain has been factory-adjusted to the nominal level required for aviation use. It should normally not require readjustment. Readjustment by a qualified avionics technician is recommended if adjustment is needed. To access the gain trimmer, insert a small flat-blade screwdriver through the access hole in the mic assembly.

  • Page 6: Specifications

    SPECIFICATIONS Receivers: Type: Dynamic Frequency Response: 100 Hz - 3.5 kHz Sensitivity: 95 dB SPL minimum (1 kHz, 1 mW input) Impedance (at 1 kHz): 150 ohms (receivers wired in parallel) Microphone and Amplifier: Element Type: Noise-canceling electret Frequency Response: 100 Hz - 3.5 kHz Sensitivity: -50 ±6 dB (ref:1 V/ µbar at 1 kHz with 12 Vdc supply voltage and 470- ohm DC , 150ohm AC load).
  • Page 7 (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.
  • Page 8 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.
  • Page 9 Notes...
  • Page 10 Notes...
  • Page 11 Notes...
  • Page 12 LIT000013 Rev A 04/2006...

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