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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
response
15 Hz to 15 kHz
Sensitivity: 90 dB SPL typical, measured at
1 mw, 1 kHz, full volume on KEMAR ear
simulator
Microphone
(Electret)
Bias required: 8 to 16 VDC through 220 to
2200 ohms
Sensitivity: Varies depending upon bias and
radio AC input impedance. Typical output is
600 mV at 114 dB SPL. To assure proper
modulation of the radio, it is recommended
that an avionics technician adjust its input to
match the output of the microphone.
Microphone
(Dynamic)
Impedance: 5 ohms
Sensitivity: Equivalent to M-87/M-101
Maximum ambi-
ent noise level
115 dBC and 105 dBA SPL
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
1
/
4
-amp, fast-blow fuse (AGC
1
/
4
-amp fuse) or
1
/
2
-amp circuit breaker
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