What type of center conductor is commonly used?

The commonly used type of center conductor in coaxial cables for telecommunications applications is the outer layer copper, inner layer clad-steel configuration. This construction offers a good balance between electrical performance and durability. Copper is an excellent conductor, ensuring efficient signal transmission with minimal loss. Clad-steel provides strength and a protective layer that resists physical damage while keeping costs down, as pure copper is more expensive and less robust.

This construction also improves resistance to environmental factors, making it particularly suitable for outdoor applications where strength and conductivity are paramount. The steel core enhances the tensile strength of the cable, which is necessary for installation in various environments.

While other options present different combinations of materials, they do not provide the same level of performance or durability required in the field. For example, pure steel lacks the conductivity needed for efficient signal transfer, and configurations with plastic or aluminum may not withstand environmental stresses as effectively.