What are RG142 Coaxial Cables?

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- everything RF

Jan 19, 2023

RG142 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.


RG142/A/B/U Cable Construction

The RG142/A/B/U is a 50-ohm coaxial cable with an overall diameter of 0.195 inches and a voltage rating of up to 1900 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 2 silver-covered copper (SC) 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 Fluorinated ethylene propylene (FEP-IX). The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG142/A/B/U cable exhibits capacitance of approximately 29 pF/ft (95.39 pF/m), and signal attenuation of around 9.0 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency). It has a center conductor measuring 0.0390 inches (0.99 mm) in diameter and an insulation layer measuring 0.116 inches (2.94 mm) in diameter. This cable is ideal for use in telecommunications, GPS, medical systems, and radar applications.

Key Specifications of RG-142/A/B/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

1900 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polytetrafluoroethylene (PTFE)

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