MIL-DTL-87104C
the jacket, moisture seal, outer conductor, dielectric, and inner conductor. Tabulate the dimensions
measured.
b.
Count the number of picks per inch, the number of carriers, the number of ends per carrier, and measure
the maximum and minimum diameters of the shield strand. Compute the percent of coverage of the inner
and outer braid and angle of shield with the cable axis. The method for computing braid construction shall
be as follows:
2
Percent coverage = (2F - F ) 100
2š P (D + 2t )
NPd
For round braid: F =
, tan a =
sin a
C
For flat braid: F = wP , tan a = 2š P (D + 2t )
sin a
C
Where:
N = the number of strands per carrier.
P = picks per inch.
d = diameter of strands.
a = angle of shield with cable axis (degrees).
D = diameter of cable under shield (inches).
t = thickness of flat strip (inches).
C = the number of carriers.
w = width of the strip (inches).
c.
For the inner conductor, measure the diameter of, and count the strands. Also measure the over-all
diameter of the inner conductor. (The measurement of the diameters of the strands shall not be required
when the inner conductor has been compacted). Tabulate the measured and calculated dimensions.
4.6.1.6.1.2 Semi-flexible cable. The following characteristics shall be measured and tabulated:
a.
Using measuring instruments at least five times more accurate than the tolerances, measure at three-inch
(76.2 mm) intervals the thickness of the outer conductor, the concentricity of the outer conductor, the
diameter of the dielectric, and the diameter of the inner conductor. Tabulate the dimensions measured.
b.
If the inner conductor consists of compacted strands, the measurement of the diameter of each strand shall
not be required.
4.6.1.6.2 Workmanship. The cable shall be examined as follows to insure that the construction of the cable has
been accomplished in a thoroughly workmanlike manner:
a.
Inspect finishes of all plated surfaces for defects.
b.
Examine all parts and surfaces for good machine shop practices.
c.
Examine the cable to insure that it is free of foreign and corrosive materials which might detract from the
intended operation or function of the cable during the normal expected life of the cable.
d.
Examine the cable to insure that all markings are legible.
4.6.1.6.3 Design and construction. The prime contractor shall define the design, material, processes, and
construction of the coaxial cable.
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