MIL-PRF-26542/11B
REQUIREMENTS
Component parts.
Microphone element: Shall be in accordance with figure 1.
Boom:
Dimensions: Dimensions of the boom shall be in accordance with USAF Drawing 67B1854, for
interchangeability with the next-higher-assembly headset-microphone.
Color: Boom shall be the same color as the microphone element.
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Finish: Shall be in accordance with MIL-PRF-26542, (see boom finish requirements).
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Operation: Shall be in accordance with MIL-PRF-26542, (see boom-operating force requirements).
Material: Shall be constructed from a high-strength, corrosion-resistant metal, meeting or exceeding
the environmental and durability requirements of MIL-PRF-26542.
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1/
Cable assembly: The cable assembly shall be PIN M22442/36-1 in accordance with either requirement
for interface to oxygen gear, interchangeability, and environmental performance. The microphone
element shall provide a complete electrical and mechanical interface with the cable assembly.
Plug assembly: U-173/U, in accordance with USAF Drawing 57B12662, or electrically and mechanically
compatible part.
Weight: 45 grams, maximum.
Performance:
Sensitivity at ground level: 34.04 dB - 42.92 dB (re 1 µV) or 50.40 µV - 139.63 µV with a Sound
Pressure Level (SPL) input of 28 dynes/cm² at 1 kHz, when tested with the microphone sound port
.187 ± .015 inch (4.75 ± .38 mm) from, and coaxial with, the opening of the artificial voice.
Frequency response envelope at ground level:
Shall be as shown on figure 2, when tested with the microphone sound port 0.187 ± .015 inch (4.75 ±
.38 mm) from, and coaxial with, the opening of the artificial voice. The response curves generated
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shall be on the same scale as shown on figure 2. 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 appropriate chart (see figure 2).
Impedance: 4.0 ohms to 6.0 ohms.
Resistive load: 5.0 ohms.
1/ The manufacturer shall meet the requirements of MIL-DTL-22442 in accordance with options
specified in MIL-PRF-26542 for `cable assemblies'.
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