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Technical Information

Sound pressure levels (SPL) are relative to 20 micropascals.

Headphone

Damage could occur to avionics equipment

that is intended for use only with 600-ohm

headsets. If in doubt, consult the avionics

equipment manufacturer.

Impedance

Monaural mode: 160 ohms (ON) and 230

ohms (OFF) at 1 kHz

Stereo mode: 320 ohms (ON), 460 ohms (OFF)

Frequency

15 Hz to 15 kHz

response

Sensitivity: 90 dB SPL typical, measured at

1 mw, 1 kHz, full volume on KEMAR ear

simulator

Microphone

Bias required: 8 to 16 VDC through 220 to

(Electret)

2200 ohms

Sensitivity: Varies depending upon bias and

radio AC input impedance. Typical output is

300 mV at 114 dB SPL. To assure proper mod-

ulation of the radio, it is recommended that an

avionics technician adjust its input to match

the output of the microphone.

Microphone

Impedance: 5 ohms

(Dynamic)

Sensitivity: Equivalent to M-87/M-101

Maximum ambi-

115 dBC and 105 dBA SPL

ent noise level

Power source

Battery powered: 2 AA alkaline, IEC LR6

Aircraft powered: 10 to 32 VDC

Battery life

Alkaline: Up to 40 hours in typical general

aviation aircraft noise. Battery life varies with

ambient noise level, temperature, ear cushion

condition and age of batteries.

Current

Operating: 25 ma in typical aircraft noise

Fuse/breaker

recommended

AM270261_00 V.pdf May 16 2003

-amp, fast-blow fuse (AGC

-amp circuit breaker

-amp fuse) or