MIL-DTL-23971D
3.4.10.2 External surfaces. If an external surface is painted, it shall be painted with semigloss or dull black enamel
in accordance with type II of MIL-DTL-14072, or primed in accordance with MIL-PRF-22750 and coated in
accordance with best manufacturing practice (see 3.1). Aluminum alloy surfaces shall be chemically treated in
accordance with MIL-DTL-5541, anodic coatings or passivation treatments in accordance with MIL-A-8625 and
ASTM-A967 or SAE-AMS2700, respectively.
3.4.10.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally.
Tin content of power divider, power combiner and power divider/combiner components and solder shall not exceed
97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.7).
3.4.11 Threaded parts. All threaded parts shall have screw threads in the unified screw thread series in
accordance with FED-STD-H28.
3.4.12 Weight. The weight, when required, shall be as specified (see 3.1).
3.4.13 Life. The manufacturer shall submit to the acquiring activity evidence that items are designed to operate for
a period of 5 years and that electrical performance characteristics degradation for this period of 5 years shall not
exceed the specified limits (absolute maximum or minimum ratings, see 3.1). This evidence shall be in the form of a
certificate to the acquiring activity on each item for which first article is requested and a written guarantee to the
acquiring activity on each awarded contract. Any acquired item that fails to meet this life requirement shall be
replaced by the manufacturer at no cost to the Government.
3.5 Electrical performance.
3.5.1 Average coupling. When the items are tested as specified in 4.7.3, the arithmetic average of the measured
coupling (dB) to the outputs shall be as specified (see 3.1) at any frequency over the specified frequency range.
3.5.2 Voltage standing wave ratio (VSWR). When the items are tested as specified in 4.7.4, the VSWR of each
port shall be not greater than the value specified (see 3.1).
3.5.3 Insertion loss. When the items are tested as specified in 4.7.5, the insertion loss (dB) shall not exceed the
value specified (see 3.1).
3.5.4 Isolation. When the items are tested as specified in 4.7.6.1, 4.7.6.2, or 4.7.6.3, the isolation (dB) shall be not
less than the value specified (see 3.1).
3.5.5 Phase balance. When the items are tested as specified in 4.7.7.1, 4.7.7.2, or 4.7.7.3, the phase balance (°)
shall be as specified (see 3.1).
3.5.6 Amplitude balance. When the items are tested as specified in 4.7.8.1 or 4.7.8.2, the amplitude balance (dB)
shall be as specified (see 3.1).
3.5.7 Power level. When the items are tested as specified in 4.7.9, there shall be no evidence of breakdown,
charring, or arcing. Following this test, VSWR, insertion loss, and isolation values shall be as specified (see 3.1).
3.5.8 Electromagnetic interference (when specified, see 3.1). When the items are tested as specified in 4.7.10, the
electromagnetic interference shall be within the limits of MIL-STD-461.
3.6 Environmental.
3.6.1 Seal. The sealing method shall be as specified (see 3.1).
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