What are RG119 Coaxial Cables?

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- everything RF

Jan 18, 2023

RG119 Coaxial Cables are a type of cable that exhibits high degree of signal integrity and low signal loss. These cables are therefore ideal for long-haul communication links, telecommunications, and networking applications.


The RG119/U is a 50-ohm coaxial cable with an overall diameter of 0.465 inches and a voltage rating of up to 6000 Vrms. It has an internal bare copper conductor (carrying the electrical signal), which is enclosed by an insulation layer made of Polytetrafluoroethylene (PTFE). The insulation layer is then completely enclosed by 2 bare 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 FG-V. The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG119/U cable exhibits capacitance of approximately 30 pF/ft (98.68 pF/m), and signal attenuation of around 3.8 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency). It has a center conductor measuring 0.1020 inches (2.59 mm) in diameter and an insulation layer measuring 0.332 inches (8.43 mm) in diameter.

Key Specifications of RG-119/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

6000 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polytetrafluoroethylene (PTFE)

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