When it comes to RF cable assemblies, these experts will give you the highest quality and highest performance at the lowest possible prices. For those of you who don't know it, RF means Radio Frequency, and these cable connectors are typically used with coaxial cables. You will recognize them when you see them, for sure. Coaxial cables are cables that have a core of a conducting material, usually copper, surrounded by an insulating layer, in turn surrounded by another conducting layer, which can be encased in another insulating shield. They transmit radio frequency signals.