A Foam Polyethylene Insulated Coaxial Cable for Direct Burial on Community TV Systems

摘要

The development of economical expanded polyethylene insulated coaxial cables for the distribution of VHF television signals at channel carrier frequencies has stimulated further interest in the problem of controlling variations in attenuation due to moisture absorption and in reducing attenuation to a minimum in small size cables. This paper discusses the use of a longitudinal copper tape outer conductor in which a soldered seam has been used to provide a hermetic moisture seal in a cable of a type used for buried distribution in cable TV systems. A discussion of the effect of moisture on cellular polyethylene is included along with typical data on the extent to which moisture can cause an increase in the attenuation of coaxial cables in moist environments. (Author)