What are RG71 Coaxial Cables?

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- everything RF

Jan 17, 2023

RG71 Coaxial Cables are a type of cable that is ideal for long distance signal transmission due to their excellent signal integrity and attenuation characteristics. They are best suited for telecommunications and networking applications.


The RG-71/A/B/U is a 93-ohm double-shielded coaxial cable with an overall diameter of 0.245 inches and a voltage rating of up to 750 Vrms. It has an inner copper weld wire (CW) or copper-clad steel (CCS) conductor (carrying the electrical signal), which is enclosed by an insulation layer typically made of air space Polyethylene (ASP). The insulation layer is then completely enclosed by 2 tinned copper (TC) braid shields that form the outer conductor and also provide shielding against electromagnetic interference (EMI). Finally, the structure is covered with an outermost layer - called a jacket - made of Polyethylene (PE-IIIA). The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG-71/A/B/U cable exhibits capacitance of approximately 14.0 pF/ft (46.05 pF/m), signal attenuation of around 8 dB/100 ft at 400 MHz (signal attenuation of the cable depends on the frequency) and has a velocity of propagation of 84%. It has a center conductor measuring 0.0253 inches (0.64 mm) in diameter and an insulation layer measuring 0.146 inches (3.71 mm) in diameter.

Key Specifications of RG-71/A/B/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

93 ohms

Maximum Voltage Rating (RMS)

750 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Air Space Polyethylene (ASP)

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