What are RG212 Coaxial Cables?

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- everything RF

Jan 20, 2023

RG212 Coaxial Cables are a type of cable that has been designed to carry high frequency electromagnetic signals over long distances, owing to their high degree of signal integrity and low signal loss. These features make them ideal telecommunications infrastructure and networking applications.


RG212/U Cable Construction

The RG212/U is a 50-ohm coaxial cable with an overall diameter of 0.332 inches and a voltage rating of up to 3000 Vrms. It has an internal silver-covered copper conductor (carrying the electrical signal), which is enclosed by an insulation layer made of Polyethylene (PE). The insulation layer is then completely enclosed by 2 silver-covered copper 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 Polyvinyl Chloride (PVC). The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG212/U cable exhibits capacitance of approximately 29 pF/ft (95.39 pF/m), and signal attenuation of around 6.5 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency), and a velocity of propagation of 66 %. It has a center conductor measuring 0.0556 inches (1.41 mm) in diameter and an insulation layer measuring 0.185 inches (4.69 mm) in diameter. This cable is ideal for use in wireless and data transmission systems.

Key Specifications of RG-212/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

3000 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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