What are RG223 Coaxial Cables?

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- everything RF

Jan 30, 2023

RG223 Coaxial Cables are a type of cable that is ideal for carrying high frequency radio signals over long distances, owing to their excellent signal integrity and low signal attenuation. These characteristics make them ideal for long haul communication links and telecommunication applications.


RG223/U Cable Construction

The RG223/U is a 50-ohm coaxial cable with an overall diameter of 0.211 inches and a voltage rating of up to 1900 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 RG223/U cable exhibits capacitance of approximately 30.8 pF/ft (101.3 pF/m), signal attenuation of around 8.8 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency), and has a velocity of propagation of 66%. It has a center conductor measuring 0.0350 inches (0.889 mm) in diameter and an insulation layer measuring 0.116 inches (2.94 mm) in diameter. This cable is ideal for use in interconnects, phasing harnesses, cable sets, radio systems, data transmission, broadcast, and computer applications. It has an operating temperature of -40˚C to + 80˚C.

Key Specifications of RG223/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

1900 V

Cable Capacitance (pF/ft)


Nominal Inductance (nH/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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