MIL-DTL-15370J
where
P is power.
Pr is reflected power.
Pi is input power.
α is coupling in dB.
d is the directivity.
The power (P) shall be applied for a period of one hour to the output of the secondary line, with both ends of the
primary line terminated in matched loads. Within 3 minutes after the 1-hour period, the VSWR of the secondary line
shall be measured as specified in 4.7.9.2, at mid-frequency in the specified frequency range. At the option of the
Government, the alternate test specified in 4.7.10.1 may be used.
4.7.10.1 Alternate test. The power dissipation of the secondary-line termination shall be determined over the
specified frequency range. Rated continuous-wave power (see 6.2) shall be applied for a period of one hour to the
input end of the primary line, with the output end of the primary line and the output of the secondary line terminated in
matched loads. After the 1-hour period, the VSWR of the secondary line shall be measured as specified in 4.7.9.2, at
mid-frequency in the specified frequency range (see 3.1).
4.7.11 Coaxial connector wear resistance (see 3.5.7). The connectors shall be subjected to 500 cycles of
connection and disconnection. A cycle shall consist of a firm connection made to the connectors of the directional
coupler with the coupling means tightened to normal tightness and the connectors then completely disconnected and
removed from the test circuit.
4.7.12 Solderability (see 3.6). The terminals of the directional coupler shall be tested in accordance with method
208 of MIL-STD-202.
4.7.13 Resistance to soldering heat (see 3.7). Directional couplers shall be tested in accordance with method 210
of MIL-STD-202. The following details and exceptions shall apply:
a.
Special preparation: The terminals shall not have been soldered previously.
b.
Depth of immersion in the molten solder: To a point .062 inch (1.57 mm) + .031 inch (0.79 mm), - 0 inch
(0.00 mm) from the body.
c.
Test condition: A.
d.
Cooling time: Stabilize to +25°C.
4.7.14 Terminal strength-lead integrity (see 3.8). Directional couplers shall be tested as specified in 4.7.14.1 or
4.7.14.1 Terminal strength. Directional couplers with terminals shall be tested in accordance with method 211 of
MIL-STD-202, test condition A, applied force 1.5 pounds.
4.7.14.2 Lead integrity. Directional couplers with leads shall be tested in accordance with method 211 of
MIL-STD-202, test condition C. The applied force shall be 8 ounces ± 0.5 ounce. For leads with a section modulus
equal to or less than that of a lead with a cross-section of 0.006 x 0.20, the force shall be 3 ounces ± 0.3 ounce.
4.7.15 Resistance to solvents (see 3.9). Directional couplers shall be tested in accordance with method 215 of
MIL-STD-202. All portions of the directional coupler shall be brushed.
4.7.16 Thermal shock (see 3.10). Directional couplers shall be tested as specified in 4.7.4. After this test, the
requirements of 3.5.1, 3.5.3, 3.5.4, and 3.5.5 shall be measured at the inspection conditions specified in 4.5.
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