What are RG174 Coaxial Cables?

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- everything RF

Jan 19, 2023

RG174 Coaxial Cables are an essential component in many electronic systems and networking installation applications. They offer excellent signal integrity and low loss during signal transmission, making them suitable for long-haul communication links. A high degree of durability and flexible design makes them ideal for both indoor and outdoor scenarios.


RG174/U Cable Construction

The RG174/U is a 50-ohm coaxial cable with an overall diameter of 0.110 inches and a voltage rating of up to 1500 Vrms. It has an inner copper-clad steel (CCS) conductor or copper weld wire (CW) (carrying the electrical signal) with 7x34 stranding construction. The inner conductor is enclosed by an insulation layer made of Polyethylene (PE). The insulation layer is then completely enclosed by 1 tinned 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 Polyvinyl Chloride (PVC).  The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG174/U cable exhibits capacitance of approximately 31 pF/ft (101.97 pF/m), and signal attenuation of around 14.7 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 0.0063 inches (2.43 mm) in diameter and an insulation layer measuring 0.06 inches (1.52 mm) in diameter. This cable is ideal for use in antennas, broadcast, radios, Telecom, LMR, CCTV, and microwave applications.

Key Specifications of RG-174/U Coaxial Cables


Typical Value

Overall Diameter (inch)


Characteristic Impedance (Zo)

50 ohms

Maximum Voltage Rating (RMS)

1500 V

Cable Capacitance (pF/ft)


Inductance (nH/ft)


Attenuation (dB/100 ft, @ 400 MHz)



Polyethylene (PE)

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