MIL-DTL-87104C
3.3.2.4.2 Adapters and flange mounted receptacles. Adapters and flange mounted receptacles shall be stamped
with the UG number, if available, the manufacturer's PIN, the manufacturer's code number, and the Federal or
National stock number.
3.3.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of coaxial assemblies and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum
of 3 percent lead, by mass (see 6.7).
3.4 Design and construction. The coaxial assembly shall be a device, consisting of a coaxial component of finite
length terminated at each end by an electrical interface, capable of mechanically and electrically interconnecting two
units of a system. The coaxial assembly shall be designed and constructed to meet the performance requirements
specified in this specification and the applicable detail specification under any combination of electrical, mechanical,
and environmental conditions specified herein.
3.4.1 Functional subassemblies. The coaxial assembly shall consist of all necessary subassemblies and
replaceable parts required to develop it into a single end item that will meet all the requirements specified herein and
in the applicable detail specification. The required functional subassemblies shall be as specified in the applicable
detail specification.
3.4.1.1 Center contact of connector. The center contact of the connector shall be mechanically attached as well
as securely soldered to the center conductor of the cable assembly.
3.4.2 Form factor. The outline dimensions, mounting provisions, and weight requirements, if applicable, for the
coaxial assembly shall be as specified in the applicable detail specification.
3.4.2.1 Weight. Unless otherwise specified in the detail specification, the coaxial assembly shall be so designed
that weight will be a minimum consistent with good engineering practice.
3.4.3 Interface design requirements. Interface design requirements for the coaxial assembly shall be as specified
in the detail specification.
3.4.4 Dielectric. Unless otherwise specified in the detail specification, the use of air or gas as a major dielectric
shall be avoided.
3.4.5 Pressurization. Any design feature requiring pressurization of the coaxial assembly with air or any other gas
shall be avoided.
3.4.6 Maintainability (see 4.8, 6.2 and 6.5). When specified by the acquiring activity, the contractor is to establish
a maintainability program.
3.4.7 Reliability (see 6.2). When specified by the acquiring activity, reliability requirements for the coaxial
assembly are to be determined.
3.4.7.1 Longevity. The coaxial assembly shall be designed to have a minimum operating life of 1,000 hours, with a
reasonable servicing and replacement of parts, when subjected to continuous periods of operation of up to 8 hours at
a time. A total operating life of 2,000 hours shall be a design objective.
3.4.7.2 Service life. The coaxial assembly shall be designed to have a life expectancy, both operating and
nonoperating, of 5 years.
3.4.8 Safety (see 6.2). Safety requirements are to be specified by the acquiring activity, when applicable.
3.4.9 Human engineering (see 6.2). Human engineering shall be specified by the acquiring activity
3.5 Performance. The coaxial assembly shall perform as specified herein and in the detail specification over the
specified frequency range when the characteristics are measured as specified in section 4 herein.
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