What are RG179 Coaxial Cables?

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- everything RF

Jan 20, 2023

RG179 Coaxial Cables are a type of cable that has been designed to enable high frequency signal transmission. These cables exhibit lower signal attenuation, making them suitable for long-haul communication links and networking applications.

RG-179/U

RG-179/U Cable Construction

The RG179/U is a 70-ohm coaxial cable with an overall diameter of 0.100 inches and a voltage rating of up to 1200 Vrms. It has an inner silver-covered copper-clad steel (SCCS) wire (carrying the electrical signal) with 7x38 stranding construction. The inner conductor is enclosed by an insulation layer made of Polytetrafluoroethylene (PTFE). The insulation layer is then completely enclosed by 1 silver-covered copper (SC) 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 Fluorinated ethylene propylene (FEP-IX) or KEL-F (PolyChloroTriFluoroEthylene).  The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG179/U cable exhibits capacitance of approximately 21 pF/ft (69.07 pF/m), and signal attenuation of around 21.0 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency). It has a center conductor measuring 0.0120 inches (0.3048 mm) in diameter and an insulation layer measuring 0.057 inches (1.44 mm) in diameter. This cable is ideal for use in applications including medical equipment, video security systems, audio security systems (where high-temperature performance is required), and computer applications.

Key Specifications of RG-179/U Coaxial Cables

Parameters

Typical Value

Overall Diameter (inch)

0.100

Characteristic Impedance (Zo)

70 ohms

Maximum Voltage Rating (RMS)

1200 V

Cable Capacitance (pF/ft)

21

Attenuation (dB/100 ft, @ 400 MHz)

21

Insulation

Polytetrafluoroethylene (PTFE)


RG-179A/B/U

RG179/A/B/U Cable Construction

The RG179/A/B/U is a 75-ohm coaxial cable with an overall diameter of 0.100 inches and a voltage rating of up to 1200 Vrms. It has an inner silver-covered copper-clad steel (SCCS) wire (carrying the electrical signal) with 7x38 stranding construction. The inner conductor is enclosed by an insulation layer made of Polytetrafluoroethylene (PTFE). The insulation layer is then completely enclosed by 1 silver-covered copper (SC) 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 Fluorinated ethylene propylene (FEP-IX).  The jacket protects the cable core from mechanical, moisture, and chemical issues.

The RG179/A/B/U cable exhibits capacitance of approximately 20 pF/ft (65.78 pF/m), signal attenuation of around 21.0 dB/100 ft at 400 MHz (signal attenuation of the cable depending on the frequency) and has a velocity of propagation of 67 %. It has a center conductor measuring 0.0120 inches (0.3048 mm) in diameter and an insulation layer measuring 0.063 inches (1.6 mm) in diameter. 

Key Specifications of RG-179A/B/U Coaxial Cables

Parameters

Typical Value

Overall Diameter (inch)

0.100

Characteristic Impedance (Zo)

75 ohms

Maximum Voltage Rating (RMS)

1200 V

Cable Capacitance (pF/ft)

20

Attenuation (dB/100 ft, @ 400 MHz)

21

Insulation

Polytetrafluoroethylene (PTFE)

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