MIL-DTL-3970F
3.4.1 Flanges. Flanges used as a part of the assembly (see 3.1) shall conform to the requirements of MIL-DTL-
3922.
3.4.2 Waveguides. Waveguides used as a part of the assembly (see 3.1) shall conform to the requirements of
MIL-DTL-85.
3.5 Voltage standing wave ratio (VSWR). When assemblies are tested as specified in 4.7.2, the VSWR shall not
exceed the value specified (see 3.1).
3.6 Insertion loss. When assemblies are tested as specified in 4.7.3, the insertion loss shall not exceed the value
specified (see 3.1).
3.7 Pressurization. When assemblies are tested as specified in 4.7.4, there shall be no leakage. Following the
test, VSWR shall be as specified in 3.5.
3.8 Salt atmosphere (corrosion). When assemblies are tested as specified in 4.7.5, there shall be no evidence of
destructive corrosion. Following this test, VSWR and insertion loss shall be as specified in 3.5 and 3.6, respectively.
Destructive corrosion shall be construed as any type of corrosion that interferes with mechanical or electrical
performance.
3.9 Vibration, high frequency. When assemblies are tested as specified in 4.7.6, there shall be no physical
damage to the assembly. Following this test, VSWR, insertion loss, and pressurization shall be as specified in 3.5,
3.10 Shock (specified pulse). When assemblies are tested as specified in 4.7.7, there shall be no physical
damage to the assembly. Following this test, VSWR, insertion loss, and pressurization shall be as specified in 3.5,
3.11 Power handling capability (when specified, see 3.1). When assemblies are tested as specified in 4.7.8, there
shall be no evidence of arcing, flashover, charring, breakdown, or overheating. After this test, VSWR and insertion
3.12 Marking. Assemblies must be marked in accordance with MIL-STD-1285, method I, on the external surface,
with the military part or identifying number (PIN) (see 3.1), and the manufacturer's source code. Marking characters
must be approximately .125 inch (3.18 mm) in height for assemblies covering frequencies up to 26.5 GHz and
approximately .063 inch (1.60 mm) in height for assemblies covering frequencies above 26.5 GHz. The
manufacturer's name or trademark may also be marked on the assembly provided such letters are not expressly
forbidden in the contract or purchase order. The preferred and permissible marking is as follows:
Preferred:
Military PIN:
M3970/1-XX-XXXX
Manufacturer source code:
ZZZZZ
Permissible
M3970/
1-XX-XXXX
ZZZZZ
3.13 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.
3.14 Workmanship. Assemblies shall be manufactured in such a manner as to be uniform in quality and the
assembly shall be free from tool marks, burrs, deep scratches, pits, corrosion, cracks, rough edges, chips, and other
defects that will affect life, serviceability, or appearance.
4. VERIFICATION
4.1 Test equipment and inspection facilities. Test equipment and inspection facilities of sufficient accuracy and
quantity to permit performance of the required inspections shall be the responsibility of the manufacturer.
Establishment and maintenance of a calibration system to control the accuracy of the measuring and test equipment
shall be in accordance with NCSL-Z540.3.
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