RG58 is a type of coaxial cable that is commonly used in various applications, including telecommunications, computer networking, and amateur radio. Here are some key features and characteristics of RG-58 coaxial cables:

• Design: RG-58 cables have a coaxial design, which means they consist of a central conductor (usually copper or aluminium), an insulating layer, a metallic shield, and an outer insulating layer. This design helps to reduce interference and signal loss.
• Impedance: RG-58 cables typically have a characteristic impedance of 50 ohms. This impedance value is suitable for many RF (radio frequency) and data transmission applications.
• Diameter: The outer diameter of the RG-58 cable is usually around 5 millimetres (0.195 inches).
• Centre Conductor: The centre conductor carries the electrical signal and is typically made of copper or aluminium. Copper is preferred for its better electrical conductivity.
• Insulation: The centre conductor is surrounded by an insulating material, usually made of polyethylene (PE), which helps maintain the separation between the centre conductor and the outer shield.
• Shielding: RG-58 cables have a braided or spiral metallic shield around the insulation. This shield provides protection against electromagnetic interference (EMI) and radio frequency interference (RFI).
• Outer Jacket: The outermost layer of the cable is the jacket, which is typically made of PVC (polyvinyl chloride) or other materials. The jacket protects the inner components from environmental factors and physical damage.
• Applications: RG-58 coaxial cables are commonly used in applications where 50-ohm impedance is required, such as connecting antennas to radios, computer networking (particularly older Ethernet standards like 10Base2), and in some test and measurement equipment.
• Limitations: RG-58 cables are suitable for shorter cable runs and lower frequencies. They are not ideal for high-frequency applications where signal loss and attenuation are critical factors. For such high-frequency applications, cables with a lower loss (lower attenuation) and a higher characteristic impedance, such as RG-213 or LMR-400, may be preferred.
• Connectors: RG-58 cables typically use BNC or TNC connectors, which are common in RF and networking applications.