MIL-DTL-15370J
4.7.21 Pressurization (see 3.15). Waveguide-type directional couplers shall be subjected to an internal gas
pressure of 30 pounds per square inch for at least 20 seconds while immersed in water at approximately 20°C. The
ends of the primary line shall be appropriately sealed.
4.7.22 Barometric pressure (see 3.16). Directional couplers shall be tested in accordance with method 105 of
MIL-STD-202, test condition D.
4.7.23 Moisture resistance (see 3.17). Directional couplers shall be tested in accordance with method 106 of
MIL-STD-202, step 7B shall be performed.
4.7.24 Salt atmosphere (see 3.18). Directional couplers shall be tested in accordance with method 101 of
MIL-STD-202, test condition B. The RF ports of the directional coupler shall be sealed for this test. After this test, the
directional couplers are allowed to be washed and dried before being inspected.
4.7.25 Electromagnetic interference (see 3.19). Test to be performed on units that are capable of 1 GHz or
greater. The swept frequency measurement shall be made covering the total frequency range in steps not exceeding
an octave band (the appropriate stub antenna should be tuned to a quarter wave at mid-octave).
a.
Place a fixed amount of RF power in a transmission line in series with available attenuator and spectrum
analyzer.
Place specified value of attenuation (see 3.19 or 3.1) in the line and note the difference in reading on the
b.
spectrum analyzer.
c.
Reset the attenuator to zero and place a λ/4 stub (at mid-band) at one end of the flexible coaxial cable and
connect to the spectrum analyzer.
d.
Place the test attenuator in a transmission line properly terminated and "SNIFF" the coupler with the λ/4
stub. The λ/4 stub should come as close to the coupler as possible without touching. Particular attention
shall be given to RF connections.
Any attenuation in excess of the value specified in 4.7.25.b shall be cause for rejecting the coupler.
e.
4.7.26 Life (see 3.20). Directional couplers shall be placed within a temperature chamber. The chamber
temperature shall be raised so that the measurement temperature is equal to the highest specified operating
temperature (see 3.1). Directional couplers shall remain at this temperature for a period of 1,000 hours. At the end
of this time, directional couplers shall be removed from the temperature chamber and allowed to cool down.
Directional couplers shall be considered cooled when their body temperature is equal to the room temperature.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact
the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Department or Defense Agency, or
within the Military Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
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