Telex ANR TM 500 - Manual (Page 7)

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: 300
Ω 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/µbar at 1 kHz with 12 VDC and 470Ω DC load,
150
Ω 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.
6.