What are RG302 Coaxial Cables?

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- everything RF

Jan 30, 2023

RG302 Coaxial Cables are a type of cable exhibiting high degree of signal integrity and low signal attenuation. They are ideal for long haul communication links, telecommunications, and networking applications.


RG302/U Cable Construction

The RG302/U is a 75-ohm coaxial cable with an overall diameter of 0.201 inches and a voltage rating of up to 2300 Vrms. It has an internal silver-covered copper-clad steel (SCCS) conductor (carrying the electrical signal), which is enclosed by an insulation layer made of Polytetrafluoroethylene (PTFE). The insulation layer is then completely enclosed by 1 silver-covered copper braid shield that forms the outer conductor and also provides shielding against electromagnetic interference (EMI). Finally, the structure is covered with an outermost layer - called a jacket - made of Fluorinated ethylene propylene (FEP-IX). The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG302/U cable exhibits capacitance of approximately 19.5 pF/ft (64.1 pF/m), signal attenuation of around 8.0 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency), and has a velocity of propagation of 69%. It has a center conductor measuring 0.025 inches (0.635 mm) in diameter and an insulation layer measuring 0.146 inches (3.70 mm) in diameter. This cable is ideal for use in security monitoring systems and control system TV systems. It has an operating temperature of -55˚C to + 200˚C.

Key Specifications of RG302/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

75 ohms

Maximum Voltage Rating (RMS)

2300 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polytetrafluoroethylene (PTFE)

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