MIL-PRF-26542/10C
Boom:
Dimensions:
Dimensions of the boom shall be in accordance with USAF Drawing 67B1854, for
interchangeability with the next-higher-assembly.
Color:
Boom shall be the same color as the microphone element.
Finish:
Shall be in accordance with MIL-PRF-26542, titled "Boom finish".
Operation:
Shall be in accordance with MIL-PRF-26542, titled "Boom operating force".
Material:
Shall be constructed from a high-strength, corrosion-resistant metal, meeting or
exceeding the environmental and durability requirements of MIL-PRF-26542.
Cable assembly: The cable assembly shall be Part or Identifying Number (PIN) M22442/38-1 in
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accordance with MIL-DTL-22442/38 and meet 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.
1/ NOTE: The cable assembly shall meet the qualification requirements of
MIL-DTL-22442, in accordance with the 2 (two) options as specified in
the "Cable assemblies", see MIL-PRF-26542.
Plug assembly:
U-173/U in accordance with USAF Drawing 57B12662 or electrically and
mechanically compatible part, on microphone end, JJ-055 type in accordance with
MIL-J-641/8, p/n M641/8-1 or equal on the free end.
Performance:
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Sensitivity at ground level: -56 dBm at 1,000 Hz with an input SPL of 2.8 Pascal's (28 dynes/cm ).
"dBm" is the power ratio in decibels (dB) of the measured power referenced to one
milliwatt (mW).
Sensitivity at altitude: Sensitivity shall be within 3 dB relative to the ground level sensitivity, when
altitude tested at 15,000 feet.
Frequency response at ground level: Shall be in accordance with figure 2. The response curves
generated shall be on the same scale as shown in 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: 150.0 ohms ± 15 ohms.
Resistive load: 150.0 ohms.
The microphone assembly shall be tested in accordance with the tests specified in table I.
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