What are RG393 Coaxial Cables?

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- everything RF

Jan 31, 2023

RG393 Coaxial Cables are a type of cable exhibiting high degree of signal integrity and low signal attenuation. They are ideal for telecommunications, networking, and indoor (for instance, laboratory testing) applications.


RG393/U Cable Construction

The RG393/U is a 50-ohm coaxial cable with an overall diameter of 0.390 inches and a voltage rating of up to 5000 Vrms. It has an internal silver-covered copper conductor with a 7-stranding construction (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 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 RG393/U cable exhibits capacitance of approximately 29.4 pF/ft (96.5 pF/m), signal attenuation of around 5.0 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency), and has a velocity of propagation of 69.5%.It has a center 7-stranding conductor design measuring 0.0936 inches (2.37 mm) in diameter and an insulation layer measuring 0.285 inches (7.23 mm) in diameter. This cable is also ideal for general purpose and laboratory applications. It has an operating temperature of -55˚C to + 200˚C.

Key Specifications of RG393/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

5000 V

Cable Capacitance (pF/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polytetrafluoroethylene (PTFE)

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