MIL-DTL-83511/5A
Type: Bar actuated four-position (to be supplied with clothing clip). Switch is in accordance with
Army drawing SM-C-430302 or equal to Astrocom Electronics P/N 10235A.
Switch: The output of the microphone shall be transferred to the output connector by means of a four-
position switch. The switch shall be in accordance with Army drawing SM-C-430302. It shall be
watertight when assembled, and marked to show the four positions of the bar (see figure 4).
Contact sequence: The switch shall provide operation in the following sequence:
a.
Position "0" Switch not depressed, off position.
b.
Position "1" Closed halfway, non-locking for "push-to-talk" telephone.
c.
Position "2" Closed halfway, pushed forward, for "lock-on" telephone.
d.
Position "3" Closed all the way, non-locking for radio.
Switch details: The switch mechanism shall be made as follows:
a. Position "0": Without any pressure at all on the switch, the contact gap of 020-inch (0.51 mm)
minimum.
b. Position "1" and "2": The open contact shall have a gap of .015 inch (0.38 mm), minimum; the
closed contact shall develop a pressure of 15 grams, minimum, and have a contact resistance not
over 0.05 ohm.
c. Position "3": Both contacts shall be closed, and the total pressure developed shall be 25 grams,
minimum. The individual contact resistance shall not be over 0.05 ohm.
d. Position "1" and "2": The force required to maintain these positions when exerted on the flat part
of the bar, at the beginning of the radius, shall be from one to two pounds.
e. Position "3": The force required to maintain this position shall be from one to two and one-half
pounds.
f. Insulation resistance: The insulation resistance, as measured with 500 volts, alternating current,
rms., between any open contacts, terminals, or other metallic parts shall be less than 10
megohms.
g. Life test: The switch shall withstand 200,000 operating cycles.
Clothes clip: The clothes clip shall be of the alligator design, and be provided with corrugated rubber
jaws. The pressure developed at the tip when the jaws are parallel to each other shall be from three to
four pounds.
Test for clothes clip pressure: The pressure developed between the tips of the jaws, when parallel,
shall be determined in any manner, and using any equipment, which is capable of effecting this
measurement with no more than ten percent error.
Interchangeability: This headset-microphone assembly is interchangeable and replaces navy type
H-172/U headset-microphone assembly.
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