What are RG219 Coaxial Cables?

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- everything RF

Jan 30, 2023

RG219 Coaxial Cables are a type of cable commonly used for high frequency signal transmission. They exhibit high degree of signal integrity and low signal attenuation, making them suitable long haul communication links.


RG219/U Cable Construction (Image Credits: Pasternack Enterprises)

The RG219/U is a 50-ohm coaxial cable with an overall diameter of 0.928 inches and a voltage rating of up to 11000 Vrms. It has 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 Bare Copper Braid Shields that form the outer conductor and also provides shielding against electromagnetic interference (EMI). The shield layer is then covered by a layer- called a jacket - made of Polyvinyl Chloride (PVC). The jacket protects the cable core from mechanical, moisture, and chemical issues. Finally, the structure is covered with an outermost layer-called armor. The armor is made of an aluminum braid and offers extra mechanical protection to the cable. 

The RG219/U cable exhibits capacitance of approximately 30.8 pF/ft (101.3 pF/m), signal attenuation of around 2.5 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 0.195 inches (4.95 mm) in diameter and an insulation layer measuring 0.680 inches (17.27 mm) in diameter. It has an operating temperature of -40˚C to + 80˚C.

Key Specifications of RG219/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

11000 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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