MIL-DTL-83511/4C
REQUIREMENTS:
Interface: Shall be at the manufacturer's option using figure 1 or optional design, see figure 2. Figures
1 through 4 are for illustration purposes only and all referenced drawings and specifications cover
design.
Earphone: Two required (1000 ohms each) shall be in accordance with MIL PRF-25670/5 Part or
Identifying Number (PIN) M25670/5-01.
Microphone: M-138/G shall be in accordance with MIL-PRF-26542 and MIL-PRF-26542/10.
Microphone boom: One required, USAF Drawing 67B1854 or equal.
Switch: Toggle shall be in accordance with MS35059 or equal.
Chest mounted switch case assembly: In accordance with army drawing SM-D-436135 with the
exception of the CX-8652/GR cable assembly which is modified as detailed in this specification
sheet. Cord connection from headset to switch case shall be made in accordance with figure 2 at
the manufacturer's option.
Cordage: Connection shall be in accordance with the wiring diagram on figure 2. The construction
of the individual cable assemblies shall be in accordance with the following military specifications or
drawings:
Bail out connectors in accordance with Army drawings SM-B-933861 and SM-D-937438.
Headband cable assembly (ear to ear) - Shall be in accordance with MIL-DTL-83511.
Headset to chest switch cable assembly -5- conductor shall be in accordance with Army drawing
SCL-6608. Watertight interface with switch case assembly.
Chest switch to bailout plug -5- conductor shall be in accordance with Army drawing SCL-6608.
Watertight interface with assembly.
Cord assemblies:
Bail out connector to "Y" junction (retrax 6:1):
49.00 inches (1244.6 mm)
"Y" junction to U-229/U
8.00 inches (203.2 mm)
"Y" junction to U-229/U
9.00 inches (228.6 mm)
Wiring schematic: See figures 3 and 4.
Interchangeability: The upper and lower cable assemblies of this headset-microphone shall be
completely interchangeable between, and mate with, cable assemblies of another manufacturer's
H-161F/GR (the bailout jack of the upper assembly will mate mechanically and electrically with the
bailout jack of the lower cable from another manufacturer.) The upper cable assembly of the
H-161F/GR will mate mechanically with the lower cable assemblies of the DH-132 and DH-132A
combat vehicle crewman helmets and will be electrically interchangeable (there will be no ballistic,
bump or attenuation protection) with the DH-132 and DH-132A helmets.
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