MIL-PRF-26542/4E
REQUIREMENTS:
Component parts: See figure 1.
Weight: 16 grams, maximum.
Performance:
Sensitivity at ground level: 36.90 dB - 42.92 dB (re 1 µV) or 69.98 µV 139.63 µV with a SPL input
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of 2.8 Pascal's (28 dynes/cm ) at 1 kHz, when tested with the microphone sound port 0.187 inch ±
0.015 inch (4.75 mm ± .38 mm) from, and coaxial with, the opening of the artificial voice.
Sensitivity at a simulated altitude: Sensitivity shall be equal to but not more than 8 dB of the ground
level sensitivity, when tested at 25,000 feet.
Frequency response at ground level and at 25,000 feet: The envelope shall be as shown on figure 2
and figure 3, when tested with the microphone sound port 0.187 inch ± 0.015 inch (4.75 mm ± .38
mm) from, and coaxial with, the opening of the artificial voice. The frequency response range of the
element shall be 200 Hz to 6,000 Hz.
The response curves generated shall be on the same scale as shown on figures 2 and 3. The
response curve shall not exceed the upper and lower limit curves of the stationary Frequency
Response Envelope, within the frequency ranges identified in the charts (see figures 2 and 3).
Impedance: 4.0 ohms to 6.0 ohms. The electrical impedance at any frequency over the range of 200
Hz to 6,000 Hz shall not deviate from the 1,000 Hz impedance by more than 20 percent.
Resistive load: 5.0 ohms.
Intended use: Microphone element M-101/AIC is a noise canceling dynamic moving coil microphone
element designed for use on a headband type headset at low altitudes or for use in an oxygen mask or
pressure-type oxygen helmet, at altitudes where the use of an oxygen helmet is required. The
microphone element is intended to provide communication under the noise conditions encountered in
military aircraft.
The microphone assembly shall be tested in accordance with the tests specified in table I.
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