MIL-PRF-26542/1E
REQUIREMENTS
Component parts.
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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Cable assembly: The cable assembly shall be PIN M22442/36-1 in accordance with either
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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: 49.77 dB - 55.79 dB (re 1 µV) or 307.96 µV - 615.88 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.
Sensitivity at altitude: Shall be within ±3 dB of initial ground level sensitivity tested at a simulated
25,000 feet.
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Frequency response envelope: Shall be as shown on figures 2 and 3, when tested with the microphone
sound port .187 ± .015 inch (4.75 ± .38 mm) from, and coaxial with, the opening of the artificial voice. The
response curves generated shall be on the same scale as shown on figures 2 & 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 appropriate chart (see figures 2 and 3).
Impedance: 150.0 ohms ±1.5 ohms.
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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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