MIL-DTL-3890C
3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.3.1.1 Aluminum. Aluminum shall conform to 1100, temper H18 in accordance with SAE-AMS-
WW -T-700/1 and shall be chemically treated inside and outside with class 3 chemical treatment in
accordance with MIL-DTL-5541.
3.3.1.1.1 Aluminum alloy. Aluminum alloy shall conform to the chemical composition and tensile
property requirements for 6061 or 6063 of ASTM B210.
3.3.1.2 Copper. Copper shall conform to type OF or DLP in accordance with ASTM B372 or ASTM
B188.
3.3.1.2.1 Copper alloy. Copper alloy shall conform to commercial bronze, 90 percent, in accordance
with ASTM B372.
3.4 Design and construction. Lines shall be of the design, construction, and overall physical
dimensions specified (see 3.1).
3.4.1 Length. Unless otherwise specified (see 3.1), lines shall be furnished in 240-inch lengths.
Lines ordered to specific or standard lengths shall conform to the tolerances in table I.
TABLE I. Length tolerances (applicable only to full length pieces).
Length
Tolerance, inch
(all plus)
Standard (20 ft)
0.5
Specific
0.25
Up to 20 ft
Over 20 ft
0.75
3.4.2 Bow. The natural bow of the lines shall not depart from a straight line more than 0.5 inch
(12.7mm) between any two points 10 feet apart on the external surface of the line. On lines less than 10
feet long, the allowable bow shall be .100 inch (2.54mm) between two points 2 feet apart.
3.4.3 Out-of-roundness. Unless otherwise specified (see 3.1), the outer and inner diameter of the
conductors at any cross section shall not differ more than 1 percent from the specified diameter.
3.5 Attenuation. W hen lines are tested as specified in 4.5.2, the attenuation shall not exceed that
specified (see 3.1).
3.6 Voltage standing wave ratio (VSW R). W hen lines are tested as specified in 4.5.3, the voltage
standing wave ratio shall not exceed the value specified (see 3.1).
3.7 Characteristic impedance. W hen lines are tested as specified in 4.5.4, the characteristic
impedance value shall not exceed the value specified (see 3.1).
3.8 Velocity of propagation. W hen lines are tested as specified in 4.5.5, the velocity of propagation
value shall not be less than that specified (see 3.1).
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