Television wired broadcasting systems

摘要

The paper outlines the growth of television wired broadcasting in the United Kingdom. After considering the fundamental problems involved in the use of video h.f. and v.h.f. frequencies, it describes the way these problems have been solved for h.f. and v.h.f. systems. Brief descriptions of practical h.f. and v.h.f. systems are given and this is followed by a comparison of the relative costs of these two systems. It is concluded that, if a large section of a town is to be wired, the h.f. system is the most economical overall. Blocks of flats in a town that has no h.f. distribution system can most economically be dealt with by a v.h.f.system. Various borderline cases in between the two extremes are dealt with. The precautions necessary for distributing colour television are mentioned, and suggestions made for appropriate tolerances to which wired broadcasting operators should work. Finally, the author gives someindication of the way in which wired broadcasting may develop in the future