Open-wire cable, also known as open-wire transmission line, refers to a type of electrical conductor consisting of two or more bare wires suspended a certain distance apart by insulators. It is commonly used for transmitting radio frequency signals, particularly at high frequencies.

Here are some key characteristics of open-wire cable:

• Construction: It typically consists of two parallel wires made of copper or aluminum.
• Insulation: The wires are not insulated from each other, but are kept apart by insulators made of glass, ceramic, or plastic.
• Spacing: The spacing between the wires is carefully chosen to achieve a desired characteristic impedance.
• Applications: Open-wire lines are mainly used for radio transmitting and receiving applications, antenna feeders, and in some high-power applications.
• Advantages:
  • Low signal loss compared to coaxial cables, especially at high frequencies.
  • Simple construction and relatively low cost.
• Disadvantages:
  • Susceptible to interference from external sources.
  • Requires careful installation to maintain consistent spacing.
  • Can be a safety hazard due to exposed conductors.

For additional details, you can refer to these resources:

• Wikipedia: Balanced Line
• W8JI: Open Wire Feeders