75 Ohms Coaxial Cable

Rg-59u is a specific type of coaxial cable, often used for low-power video and rf signal connections. The cable has a characteristic impedance of 75 ohms, and a capacitance of around 20pfft (60pfm).[1] the 75 ohm impedance matches a dipole antenna in free space. Rg (for radio guide) was originally a unit indicator for bulk radio frequency (rf) cable in the u.s. Military's joint electronics type designation system. The suffix u means for general utility use. The number 59 was assigned sequentially. The rg unit indicator is no longer part of the jetds system (mil-std-196e) and cable sold today under the rg-59 label does not necessarily meet military specifications.