What are RG133 Coaxial Cables?

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- everything RF

Jan 19, 2023

RG133 Coaxial Cables are a type of cable that has been designed to enable high frequency signal transmission. These cables exhibit lower signal attenuation, making them suitable for long-haul communication links and networking applications.


The RG133/A/U is a 95-ohm coaxial cable with an overall diameter of 0.405 inches and a voltage rating of up to 4000 Vrms. It consists of an internal bare 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 1 tinned copper braid or bare copper braid shield that forms 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 RG133/A/U cable exhibits capacitance of approximately 16 pF/ft (52.63 pF/m), and signal attenuation of around 5.7 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency). It has the center conductor measuring 0.0253 inches (0.642 mm) in diameter and an insulation layer measuring 0.285 inches (7.2 mm) in diameter.

 Key Specifications of RG-133/A/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

95 ohms

Maximum Voltage Rating (RMS)

4000 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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