MIL-DTL-3890C
4.5.6 RF power handling capability (see 3.9) (when specified, see 3.1). The power handling capability
shall be determined by subjecting the lines to average RF power at the specified lowest frequency, VSW R
of unity (as nearly as possible), one atmosphere of dry air (40% relative humidity maximum) pressure at
sea level and the highest temperature continuously for 30 minutes or until the line temperature stabilizes,
whichever comes first. The lines shall also be subjected to peak power at the specified lowest frequency
and the highest temperature for 30 minutes or until the line temperature stabilizes, whichever comes first.
The lines shall be terminated in a matched load. Following each power test, attenuation and VSW R shall
be measured as specified in 4.5.2 and 4.5.3, respectively.
4.5.7 Dielectric withstanding voltage (see 3.10). The lines shall be tested in accordance with method
301 of MIL-STD-202. The following details shall apply:
a. Conditions of test. One atmosphere of dry air (40% relative humidity) pressure at sea level.
b. Duration of application. W hen the specified test voltage (see 3.1) is:
(1) Less than 1,500 volts rms, the voltage shall be instantaneously applied.
(2) Above 1,500 volts rms, the voltage shall be applied at approximately 500 volts per second
until the rated test voltage is reached or breakdown occurs.
c. Points of application. The 60-cycle voltage shall be applied between the inner conductor and the
outer conductor of the line.
4.5.8 Vibration, high frequency (see 3.11). The lines shall be tested in accordance with method 204
of MIL-STD-202. The following details shall apply:
a. Method of mounting Clamp the lines to the table. No part of the lines shall touch any object
other than the clamps (one clamp at each end and one in the middle if required).
b. Test condition letter B.
c. Examination after test Attenuation and VSW R shall be measured as specified in 4.5.2 and
4.5.3.
4.5.9 Pressurization (when specified) (see 3.12). W ith the line ends properly sealed, the line shall be
subjected to the internal gas pressure specified (see 3.1) for at least 20 seconds while immersed in tap
water at a temperature of approximately 20ºC. Unless otherwise specified (see 3.1), the internal gas
pressure shall be 30 ± 1 pound per square inch. During immersion, the lines shall be observed for
evidence of leakage as indicated by escaping air bubbles.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). W hen packaging of material is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service 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.
6. NOTES
(This section contains information of a general and explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. Transmission lines are used to transmit RF energy in the microwave region of the
spectrum.
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