MIL-DTL-11134G
3.2 Construction. The equipment shall be constructed in accordance with the requirements of this specification
and Drawings and Data List SC-DL-105364 (including the requirements for parts, materials and processes thereon)
(see 4.3).
3.2.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of handsets and components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.6).
3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.3 Finish. The equipment shall be finished in accordance with MIL-DTL-14072 and the equipment component
drawings were specified (see 4.3).
3.4 Marking. Marking shall be in accordance with MIL-STD-13231 (see 4.3).
3.5 Performance characteristics.
3.5.1 Insulation resistance. The insulation resistance between connector pins intended to be insulated from each
other and between all pins connected together and external metal shall be 10 megohms minimum. (see 4.6.2.1)
3.5.2 Operation. The handset shall transmit and receive intelligible voice signals without buzzing, rattling or other
spurious sounds. Transmission shall be possible only with the push-to-talk switch depressed. (see 4.6.2.2)
3.5.3 Microphone (M-35/U).
3.5.3.1 Microphone element. Microphone element dimensions shall be in accordance with drawing SC-C-61800.
3.5.3.2 Response. (see 4.6.2.3.1)
a. With the plane of the acoustic entrance vertical, a bias current of 85 milliamperes (dc) and a sound pressure
input of 2.8 pascals (Pa), the power output of the microphone in the range of 300 to 4,000 Hertz (Hz) shall fall
within the envelope on figure 1. For any bandwidth indicated below for the various frequency ranges, the change
in response from the lowest to the highest frequency in the band shall not exceed the limits shown.
Bandwidth (Hz)
Frequency Range (Hz)
Changes in
Response (dB)
100
300-1,000
0
+3
300
1,000-2,000
-1
+5
300
2,000-3,000
-2
+1
200
3,000-3,500
-3
+2.5
500
3,500-4,000
-5
+3
b. The response of the microphone shall be within 5 db of the response obtained in a., above, when measured
with the microphone rotated in a vertical plane +90, -90, +45 and -45 degrees.
c. With the plane of the acoustic entrance vertical, a bias voltage of 1.5 volts (dc) and a sound pressure input of
2.8 Pa, the power output of the microphone shall be not less than the values shown.
Frequency (Hz)
Response (dB above 1 mV)
300
9
500
14
1,000
22
2,000
28
3,000
29
3
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