ECA 199-A

Abstract

<strong>General</strong> <br>This standard refers to solid- and semi-solid-dielectric coaxial-cable transmission lines conasi sting of one or two inner conductors. <br><strong>Coaxial Cables</strong> <br>Basically, a 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, with the whole covered by a protective covering. In some cases this is covered by an extra outer braided armor for use in extremely abusive applications. Each element of the construction is designed to contribute to the requirements of the finished product. <br>Two-Conductor Coaxial Cables Individual dielectric cores of two-conductor coaxial cables shall meet the requirements of solid or semi-solid 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. <br><strong>Twin-Coaxial Cables</strong> <br>Twin-coaxial cables shall be constructed of individual inner conductors within individual dielectric cores, within a common outer-conductor braid. As an alternate construction, a twin-coaxial cable may be constructed of individual inner conductors within individual inner dielectric cores, within a common outer core that may be filled-to-round. <br><strong>Dual-Coaxial Cables</strong> <br>Dual-coaxial cables shall be constructed of individual inner conductors within individual dielectric cores, within individual outer conductor inner braids, within a common outer conductor outer braid. <br><strong>Application</strong> <br>Coaxial cables covered by this standard are primarily intended for use as transmission lines to conduct energy in a simple power transfer, continuously or intermittently. In general, these coaxial cables are designed for low-loss stable operation from the relatively low radio frequencies thru the higher frequencies encountered in the microwave and radar regions of the frequency spectrum. Typical uses include runs of cable carrying critically exact signals between or within units of electronic, radio, television or other communication equipment. Coaxial cables may also be used as circuit elements, delay lines or impedance matching devices. <br><strong>PURPOSE</strong> <br>The primary object of this standard is to insure the uniformity of similar-type coaxial cables obtained from different sources of supply. It is also intended that this standard shall serve as a guide in the manufacture and application of these cables. <br>In view of the extensive use of solid- and semi-solid-dielectric coaxial cables requiring a wide range of impedances, sizes and other characteristics, care has been taken in this standard to avoid unnecessarily restrictive standardization but at the same time, wherever feasible, to limit the number of designated standard types.