MIL-DTL-15370J
3.15 Pressurization. When waveguide type directional couplers are tested as specified in 4.7.21, there shall be no
leakage, as detected by the continuous formation of escaping air bubbles. Upon completion of this test, directional
3.16 Barometric pressure. When directional couplers are tested as specified in 4.7.22, there shall be no evidence
of physical damage. During this test, directional couplers shall meet the requirements of 3.5.1, 3.5.3, 3.5.4, and
3.17 Moisture resistance. When directional couplers are tested as specified in 4.7.23, there shall be no destructive
corrosion. Destructive corrosion shall be construed as any type of corrosion which in any way interferes with
mechanical performance or appearance.
3.18 Salt atmosphere. When directional couplers are tested as specified in 4.7.24, there shall be no evidence of
warping, cracking, peeling, or corrosion that has passed through the plating and exposed the base metal, or any lead
breakage when viewed through a magnification of at least 10X. Any of these shall be considered a directional
coupler failure.
3.19 Electromagnetic interference (EMI). When directional couplers (excluding flat packs, TO configurations, and
printed circuit configurations) are tested as specified in 4.7.25, the RF leakage from the directional coupler shall be at
least 65 dB below the incoming signal level.
3.20 Life. When directional couplers are tested as specified in 4.7.26, there shall be no evidence of damage.
Upon completion of this test, directional couplers shall meet the requirements of 3.5.1 through 3.5.6.
3.21 Marking. Directional couplers and their individual shipping containers shall be marked in accordance with
MIL-STD-1285 with the military PIN (see 1.2), manufacturer's CAGE code, or logo, the coupling value (in dB), date
code, and serialization in the location specified. The following may be omitted from the body of the device but must
be specified on the shipping container:
a.
Serial number.
b.
Coupling value (in dB).
3.21.1 Signal power flow. On unidirectional couplers, an arrow shall be placed so as to point in the direction in
which incident power flows. On bidirectional couplers which have two different couplings, the coupling of each
secondary line shall be indicated separately in a manner that will make clear which coupling is associated with each
secondary line. Bidirectional couplers shall be marked to indicate which of the secondary lines has a nominal
response to each direction of incident power flows. Marking shall be accomplished by reverse etching on metal
identification plates, by engraving, by photo etching in accordance with MIL-P-19834, with permanent ink stamping in
accordance with MIL-STD-130, or silk screen. The marking shall be placed on the directional coupler, or other
means of identification shall be used if the package size (i.e., small to series) does not permit the above marking
manner.
3.21.2 Date code. Directional couplers shall be marked by a unique code to identify the period during which they
were manufactured. The first two numbers in the code shall be two digits of the number of the year, and the third and
fourth numbers shall be two digits indicating the calendar week of the year. When the number of the week is a single
digit, it shall be preceded by a zero reading from left to right or from top to bottom, the code number shall designate
the year and week, in that order. The date code shall not be altered or removed from the directional coupler. A new
date code followed by the letter R shall be marked on all reworked directional couplers.
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