RG coaxial cables These radio frequency cables conform to the requirements of JAN-C-17, MIL-C-17 and DSP-C-3102, and are widely used in the United States as well as Japan. The cables in this type are all designated with the letters RG-/U, where RG stands for "Radio Guide" and /U indicates "Universal." Features Features RG coaxial cables are available in many different types with features as follows: High insulation resistance High dielectric strength Lightweight and easy to handle Excellent water resistance and aging resistance High mechanical strength Conform to the RoHS directive.