MIL-DTL-15370J
3.5.5.2 Secondary line (see 6.4.4). When directional couplers are tested as specified in 4.7.9.2, the VSWR over
the specified frequency range shall not exceed the value specified.
3.5.6 Power dissipation of secondary-line termination. When directional couplers are tested as specified in 4.7.10,
the VSWR of the secondary line at mid-frequency (see 6.4.5) of the specified frequency range shall be as specified in
3.5.7 Coaxial connector wear resistance. When directional couplers are tested as specified in 4.7.11, there shall
be no damage to the connectors that will cause an electrical failure. During and after cycling, neither lubrication nor
removal of excess material shall be permitted. After this test, directional couplers shall meet the requirements of
3.5.4 and 3.5.5. This test may be omitted if military specification connectors (such as, MIL-PRF-39012) are used in
the manufacturing of the end product.
3.6 Solderability. When directional couplers with solderable connections are tested as specified in 4.7.12, there
shall be no evidence of pin holes and blistering.
3.7 Resistance to soldering heat. When directional couplers with solderable connections are tested as specified in
4.7.13, there shall be no damage to the directional coupler or to the terminal insulator that will cause electrical failure.
Chipping of the terminal insulator shall not be cause for failure unless the chipping extends to the outer periphery.
After this test, directional couplers shall meet the requirements of 3.5.5.
3.8 Terminal strength-lead integrity. When directional couplers with terminals or leads are tested as specified in
4.7.14, there shall be no evidence of a broken terminal or lead elongation greater than one-half of the thread pitch, or
breakage, loosening or relative motion between the terminal and the directional coupler body when viewed through a
magnification of at least 10X. Any of these shall be considered a failure.
3.9 Resistance to solvents. When directional couplers are tested as specified in 4.7.15, there shall be no evidence
of illegible marking, mechanical damage, or deterioration of material or finishes to the extent that they can be readily
identified from a distance of at least 6 inches with normal room lighting and without the aid of magnification or with a
viewer having a magnification no greater than 3X. Resistance to solvents test is not required for units that are laser
marked or engraved.
3.10 Thermal shock. When directional couplers are tested as specified in 4.7.16, there shall be no evidence of
physical damage. Upon completion of this test, directional couplers shall meet the requirements of 3.5.1, 3.5.3, 3.5.4,
and 3.5.5.
3.11 Vibration. When directional couplers are tested as specified in 4.7.17, there shall be no evidence of physical
damage.
3.12 Shock. When directional couplers are tested as specified in 4.7.18, there shall be no evidence of physical
damage. Upon completion of this test, directional couplers shall meet the requirements of 3.14 or 3.15, as applicable.
3.13 Acceleration. When directional couplers are tested as specified in 4.7.19, there shall be no evidence of
physical damage. Upon completion of this test, directional couplers shall meet the requirements of 3.5.1, 3.5.3, 3.5.4,
and 3.5.5.
3.14 Seal. When hermetically sealed directional couplers are tested as specified in 4.7.20, the applicable amount
of leakage rate shall not be exceeded nor shall there be evidence of physical damage. Upon completion of this test,
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