MIL-DTL-287J
3.4.3.3 Flexible waveguide finish. With the exception of OFHC, all copper alloy, or beryllium copper flexible
waveguides, internal surfaces shall be silver plated in accordance with ASTM-B700, with supplementary tarnish-
resistant treatment (chromate treatment), at least .0003-inch (0.008 mm) thick. OFHC copper shall be chemically
treated with copper iridite; all aluminum or aluminum alloy flexible waveguide surfaces shall be chemically treated in
accordance with MIL-DTL-5541.
3.4.4 Assembly length. The nominal relaxed length of an assembly shall be measured from the face of one
flange to the face of the other and shall be measured in inches and halves of an inch. Assembly length tolerances
shall be in accordance with table I.
TABLE I. Length tolerance.
Assembly length (Inches)
Tolerance (Inch)
± .090 (2.29 mm)
Up to 36, inclusive
± .125 (3.18 mm)
Over 36 and up to 72, inclusive
± .250 (6.35 mm)
Over 72
For indicating the length in the military part number (see 6.6), the following shall apply:
a. When the required length is less than 10 inches (254 mm), the number shall be preceded by 2 zeros.
b. When the required length is from 10 to 100 inches (2540 mm), the number shall be preceded by 1
zero.
3.5 Performance requirements.
3.5.1 Insertion loss. When assemblies are tested as specified in 4.7.2, the insertion loss shall not exceed the
value specified (see 3.1).
3.5.2 Stability of insertion loss. When assemblies are tested as specified in 4.7.3, the maximum insertion loss
shall not exceed the value specified (see 3.1) by more than 25 percent.
3.5.3 Voltage standing wave ratio (VSWR). When assemblies are tested as specified in 4.7.4, the VSWR shall
not exceed the value specified (see 3.1).
3.5.4 Pressurization. When assemblies are tested as specified in 4.7.5, there shall be no leakage or, when
applicable, loss of adherence of the jacket. Following this test, the stability of insertion loss and VSWR shall be as
3.5.5 Cold bending. When assemblies are tested as specified in 4.7.6, there shall be no checks, cracks,
fractures or other flaws in the jacket or metal structure, as applicable. Following this test, pressurization shall be as
specified in 3.5.4.
3.5.6 Vibration, high frequency. When assemblies are tested as specified in 4.7.7, there shall be no mechanical
damage to the jacket or the metal structure, as applicable. Following this test, the insertion loss and VSWR shall be
3.5.7 Retention. When assemblies are tested as specified in 4.7.8, to the force specified (see 3.1), there shall be
no physical damage to the assembly. The length of the assembly shall not change by more than .060 inch (1.54
mm) per foot of assembly length (see 3.4.4). Following this test, the VSWR and pressurization shall be as specified
3.5.8 Shock. When assemblies are tested as specified in 4.7.9, there shall be no physical damage to the
assembly. Following this test, the insertion loss and VSWR shall be as specified in 3.5.1 and in 3.5.3, respectively.
3.5.9 Salt Atmosphere (Corrosion). When assemblies are tested as specified in 4.7.10, there shall be no
evidence of destructive corrosion and the insertion loss, stability of insertion loss, and VSWR shall be as specified in
3.5.1, 3.5.2, and 3.5.3, respectively. Destructive corrosion shall be construed as any type of corrosion which in any
way interferes with mechanical or electrical performance.
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