MIL-PRF-26542 Microphone, And Microphone Assemblies, Dynamic General Specification ForThis specification covers the general requirements for moving coil, noise-canceling dynamic microphones. The products described herein are used in oxygen and gas-masks, and headset-microphones \(boom-mounted and protective-shield mounted\). These parts provide communications within moderate to high noise environments, at ground level and altitude, as specified, and meet established United States Air Force sensitivity standards \(see 6.1\).

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MIL-PRF-26542F

Inches

.125

3.18

12.000

304.80

.188

4.78

13.000

330.20

.750

19.05

13.750

349.25

6.875

174.62

14.500

368.30

7.000

177.80

14.812

376.22

7.188

183.58

15.375

390.52

7.312

185.72

16.000

406.40

7.500

190.50

25.500

647.70

9.375

238.12

26.125

663.58

11.000

279.40

27.000

685.80

NOTES:

1. Dimensions are in inches. Tolerance is 10 percent, unless otherwise specified.

2. Equivalent alternatives are allowed to the following: Lord mountings, Akoustikos felt,

Acousti-Celotex, J.R.B. microphone, and Jensen speaker.

3. Metric equivalents are given for general information only and are based upon 1 inch = 25.4 mm.

FIGURE 1. Signal-to-noise test chamber.