Glossary  >  RG-58



The RG-58 is a lightweight coaxial cable commonly used for low-power signal and RF (radio frequency) connections. The standard RG-58 cable has an impedance of about 50 Ohms and a pure unleaded copper central conductor.

However, there are variations, such as the RG-58A/U, which features a flexible 7- or 19-strand center conductor. There are also variations with different core materials, such as solid or braided tinned copper conductors.

The cable has an outer diameter of about 0.195 inches and a weight of about 37 g/m, making it very flexible and ideal for indoor applications. The RG-58 is the most commonly used cable in two-way communication systems like CB radio and WLAN antennas.

Previously, the RG-58 was widely used in 10BASE2 Ethernet, which allowed a maximum run length of about 185 meters. However, it’s now almost completely replaced by Cat 5 and Cat 6 twisted pair cables.

Here’s a quick specification comparison between the different versions of the RG-58 cable:

  RG-58 RG-58A RG-58B RG-58C
Capacitance 28.8 29.6 28.8 30.8
Attenuation (at 400 MHz) 11.7 dB/100 ft 13.2 dB/100 ft 14 dB/100 ft 14 dB/100 ft

Example of RG-58 in a sentence

"The RG-58 cable is designed to work with two-way radio systems where a signal can be received and transmitted at the same time."

Related Terms for RG-58