Coax cables come in two distinct types, namely, 75 ohm and 50 ohm.
Radio frequency or application, generally, adopts 50 ohms as the norm while, for camera or TV (CCTV) applications, they generally use 75 ohms.
Coax cable comes in either stranded or a solid conductor. The single, solid conductor is accepted as the superior type and is widely accepted as being more efficient than stranded core cable.
The outer sheath on a coax cable is either PTFE or PVC material and the choice will depend on your application. PVC sheathed cable is used for indoor applications while PTFE cable is used in outdoor situations.
The highest level of coax cable is double screened. Double screened cable is where there is the centre core, the screen, usually stranded or braided and the a lapped foil outer screen as well.
The dielectric in coax cable is the space between the main conductor and the screen. This varies in size and is determined by the length of run in your application i.e. the longer the run the higher the diaelectric. |
