MIL-DTL-11134G
3.5.4.4 Impedance. The input impedance of the earphone at 1,000 Hz shall be 300 ohms + 50 or 30 ohms (see
3.5.5 Push-to-talk switch. See 4.6.2.5.
3.5.5.1 Make-break sequence. The microphone contacts shall make, before the control contacts make. The
control contacts shall break, before the microphone contacts break (see 4.6.2.5.1).
3.5.5.2 Endurance. The switch shall be capable of 500,000 make-break operations when tested in accordance
with 4.6.2.5.2.
FREQUENCY - Hz
Frequency
300
500
1,000
2,000
3,000
4,000
points Hz
Upper
limits (dB)
+111.0
+111.0
+111.0
+112.0
+112.0
+107.0
Lower
limits (dB)
+105.0
+105.0
+104.0
+102.0
+101.0
+97.0
FIGURE 2. Earphone response limit curves.
3.5.6 Handle assembly. The handle assembly shall be in accordance with drawing SC-D-76326 with one of three
types of inserts made of aluminum alloy 2011 with finish E511 (see 3.3).
3.5.7 Connector plug U-161/U. Connector plug U-161/U shall be in accordance with drawing SC-D-22580 and
MIL-C-10544.
3.6 Environmental. The equipment shall meet the following environmental conditions.
3.6.1 Temperature.
3.6.1.1 Low. During and after testing as specified in 4.7.1.1, the equipment shall meet the requirements of 3.5.3.1
and 3.5.4.1 with no more than a 2 dB change in response.
3.6.1.2 High. During and after testing as specified in 4.7.1.2, the equipment shall meet the requirements of 3.5.3.1
and 3.5.4.1 with no more than a 2 dB change in response.
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