Telex ANR TM 500 operating instructions Receivers, Microphone and Amplifier, Power, Fail-Safe Mode

Specifications

Receivers:

Type: Dynamic

Frequency Response: ±6dB re 1000 Hz over the range 350 - 3000 Hz

Sensitivity: 90 ±5 dB SPL (1 kHz, 1 mW input per earcup side)

Impedance: 300Ω stereo or 150Ω monaural mode

Stereo/Mono:

Switch located on the control module, allows stereo or monaural headset op- eration

Microphone and Amplifier:

Element Type: Noise-canceling electret

Frequency Response: 300 to 5 kHz

Sensitivity: -51 ±3 dB (ref: 1V/∝bar at 1 kHz with 12 VDC and 470Ω DC load, 150Ω AC load

Matching Impedance: 50-600 ohms

Gain Adjustment Range: ±5 dB (clockwise rotation increases gain)

Operating Voltage(supplied by aircraft radio): 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 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 will be automatically routed to the headset receivers.

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