In telecommunications, standing wave ratio (SWR)'s the ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line. The SWR's usually defined as a voltage ratio called the VSWR, for voltage standing wave ratio. For example, the VSWR value 1.2:1 denotes a maximum standing wave amplitude that's 1.2 times greater than the minimum standing wave value. It's also possible to define the SWR in terms of cur… (More on Vswr)