NPFC - MIL-C-17
CABLES, RADIO FREQUENCY, FLEXIBLE AND SEMIRIGID, GENERAL SPECIFICATION FOR
|Publication Date:||9 March 1990|
This specification covers flexible and semirigid cables with solid and semisolid dielectric cores, with single, dual and twin inner conductors. Cables covered by this specification are primarily intended for use as transmission lines to conduct energy in a simple power transfer continuously or intermittently. In general, these cables are designed for low-loss, stable operation from the relatively low frequencies through the higher frequencies in the microwave and radar regions of the frequency spectrum. Cables may also be used as circuit elements, delay lines or impedance matching devices. These cables are supplied under a reliability assurance program as specified in section 3.
Cables shall be the part number, as specified (see 3.1).
A flexible coaxial cable is constructed of a single inner conductor covered by a flexible low-loss r-f dielectric core material, which is then surrounded by a braided outer conductor(s), with the whole covered by a protective covering. In some cases this is covered by an extra braided armor for use in extremely abusive applications. Each element of the cable is designed to contribute to the requirements of the finished product.
Semirigid coaxial cables are constructed of a single inner conductor covered by a flexible low-loss r-f dielectric core material, which is then surrounded by a solid, continuous, metallic outer conductor.
Individual dielectric cores of two-conductor cables
shall meet the requirements of solid or semisolid dielectric cores. One strand of
one of the inner conductors shall be coded for identification and shall be visible
without disturbing the stranding. That is, if all of the strands of the inner
conductors are coated, then one strand shall be bare; or if all of the strands are
bare, then one strand shall be coated.
Beneficial comments (recommondations, additions, deletions) and any pertinent
data which may be used in improving this document should be addressed to:
US Army Communications-Elect
a. Twin. Twin cables shall be constructed of individual inner conductors within individual dielectric cores, within a common outer conductor or may have individual inner conductors within a common outer core that may be filled-to-round.
b. Dual. A dual cable shall be constructed of individual coaxial cables enclosed within a common outer conductor.
Triaxial cables are constructed the same as regular coaxial cables except for an additional interlayer of dielectric material over the outer conductor, over which is laid an extra shield, with the whole covered by a protective covering.