MIL-DTL-5794C
3.3.4 Cementing compound. Any cementing compound used in the construction of the microphone
unit, shall be of such a character and quality that it will withstand all service and test conditions specified
herein, without evidence of loosening or otherwise affecting the performance requirements of the
microphone unit.
3.3.5 Soldering flux. Only rosin or rosin-core solder may be used as a flux in the assembly of the
microphone unit.
3.3.5.1 Soft solder. Soft solder shall not be depended upon, for the mechanical strength of any
soldered joint. There shall be no evidence of "cold soldering" and the use of excessive amounts of solder
will not be acceptable. Soft solder shall be solid or rosin flux-cored in accordance with composition
Sn97Pb3 of J-STD-004, J-STD-005, and J-STD-006.
3.3.5.2 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of loudspeaker components and solder shall not exceed 97 percent, by mass. Tin
shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3)
3.3.6 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.
3.4 Detail requirements.
3.4.1 Design. The microphone units shall be of the noise-canceling carbon microphone type. In
general, the design and assembly of the microphone units shall be such that they will be inherently stable
in mechanical, electrical, and acoustical characteristics. It shall not be necessary to condition a
microphone unit by any special procedure before it is ready for use. Each microphone unit shall consist
of a plastic housing and a separate integral assembly containing the active operating elements. The
electro-acoustical performance of this element shall not be adversely affected by stresses or deformation
of the plastic housing. This element, when completely assembled, shall be mechanically rigid and sealed
to prevent entrance of moisture into the carbon chamber of the unit.
3.4.2 Microphone cover. Microphone Unit M-6A/UR shall be equipped with a cover for protection
against breath and air blasts and icing. The cover shall be a thin rugged membrane held in place over
the front and rear grids of the microphone unit. The design shall be such as to permit easy removal and
replacement of the cover. The frequency response and noise-canceling characteristics of the microphone
unit shall remain essentially unchanged with the cover in place on the microphone unit, or removed.
3.4.3 Contour and dimensions. The shape and dimensions of Microphone Unit M-6A/UR shall be as
specified on figure 1. The shape and dimensions of Microphone Carbon M-51/UR shall be as specified
on figure 2.
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