MIL-DTL-28839B
3.4.2 Length. The length of the finished waveguide shall be as specified (see 3.1). The waveguide length
tolerance shall be in accordance with table I.
TABLE I. Length tolerances.
Waveguide length
Tolerance
(feet)
-0
0-25
inch
+1
± 2 percent
25 or greater
3.5 Voltage standing wave ratio (VSWR). When waveguides are tested as specified in 4.6.2, the VSWR shall not
exceed the value specified (see 3.1).
3.6 Attenuation. When waveguides are tested as specified in 4.6.3, the attenuation shall not exceed the value
specified (see 3.1).
3.7 Pressurization (flexible type only). When waveguides are tested as specified in 4.6.4, there shall be no
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leakage, no distortion of aperture due to pressure, and the pressure shall not have dropped more than 2 lbf/ft . After
the test, the VSWR shall be as specified in 3.5.
3.8 Bending radius (flexible type only). When waveguides are tested as specified in 4.6.5, the bend shall be
smooth and continuous without distortion of the cross-sectional aperture. After this test, the VSWR shall be as
specified in 3.5.
3.9 Axial twist. When waveguides are tested as specified in 4.6.6, the twist shall be smooth and continuous
without distortion of the cross-sectional aperture. After this test, the VSWR shall be as specified in 3.5.
3.10 Vibration, high frequency (flexible type only). When waveguides are tested as specified in 4.6.7, there shall
be no mechanical damage to the jacket or the metal structure, as applicable. After this test, the VSWR and
3.11 Shock (specified pulse), (flexible type only). When waveguides are tested as specified in 4.6.8, there shall be
no evidence of cracking or separation of the jacket, as applicable. After this test, the VSWR and attenuation shall be
3.12 Moisture resistance (flexible type only). When waveguides are tested as specified in 4.6.9, there shall be no
evidence of cracking or separation of the jacket, as applicable. After this test, the VSWR and attenuation shall be as
3.13 Thermal shock (flexible type only). When waveguides are tested as specified in 4.6.10, there shall be no
evidence of damage to the jacket or metal structure. After this test, the VSWR and attenuation shall be as specified,
3.14 Power handling capability (when specified, see 3.1 and 6.2). When waveguides are tested as specified in
4.6.11, there shall be no evidence of mechanical damage to the metal structure or the jacket, as applicable. After this
test, the VSWR shall be as specified in 3.5.
3.15 Surface roughness. When waveguides are tested as specified in 4.6.12, the interior surface roughness shall
not exceed the value specified (see 3.1).
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