Recent developments in coaxial cables for television distribution

The paper outlines the requirements for coaxial cables for television distribution purposes in Bands I and III. The various factors affecting the performance of such cables are mentioned, and recent improvements in construction of the outer conductor and dielectric are discussed. A description is given of the test methods used for determining the uniformity of impedance of cable lengths and the relative screening efficiency of the various constructions. Details are given of the characteristics of the various newly developed cables and these are compared with the more standard braided constructions. The cables are divided into two classes: (a) those suitable for trunk routes, and (b) smaller cables for distribution purposes