Coaxial cables use bare copper wire as the core conductor, primarily based on copper's conductivity and high-frequency signal transmission characteristics. This design has become an industry standard in television signal transmission and network communication, underpinned by a balance between the physical principles of electromagnetic wave conduction and engineering practice.
Bare copper wire offers the advantage of the skin effect in radio frequency transmission. When high-frequency current passes through the conductor, electrons tend to flow towards the surface, and copper's low resistivity effectively reduces signal attenuation. Compared to plated copper wire, the directly exposed nature of bare copper conductors makes its surface oxide layer easier to control, which is particularly crucial in coaxial cable structures requiring precise impedance matching. The SYWV series 75-ohm cable utilizes this characteristic to achieve stable signal transmission.
The industry has clear technical routes for the selection of coaxial cable conductors. Broadcast television systems generally use bare copper wire instead of tin-plated copper because tin plating alters the conductor's surface impedance characteristics. However, bare copper wire needs to be combined with sheathing materials such as PVC to prevent oxidation. This material combination ensures signal integrity while suppressing electromagnetic interference through the outer shielding structure, reflecting a balance between transmission efficiency and durability.
In practical applications, home decoration scenarios prioritize the installation flexibility and connector compatibility of bare copper wires, while engineering applications emphasize long-term stability. When cables require frequent bending, the memory effect of single-core bare copper wires is weaker than that of multi-strand stranded wires, which is a key reason why cables like SYWV-5 use a single-core design. Understanding these differences in characteristics helps in selecting the appropriate cable structure for specific scenarios.
