What does the term "SWR" stand for in radio terminology?

The term "SWR" stands for "Standing Wave Ratio." This concept is crucial in the field of amateur radio as it measures the efficiency of power transfer from a transmitter through an antenna system. A standing wave ratio indicates the relationship between the forward power (the power traveling towards the antenna) and the reflected power (the power that reflects back towards the transmitter due to impedance mismatches).

A lower SWR value (close to 1:1) signifies that most of the transmitted power is being effectively radiated by the antenna rather than being reflected back, which can help reduce the risk of damage to the transmitter and improve overall performance.

In contrast, the other terms provided do not accurately represent what SWR refers to in radio communication. Options related to "Signal Wave Ratio," "Standard Wave Reflection," and "Signal Wavelength Range" do not capture the specific relationship of standing waves in the context of power transmission and antenna performance, which is central to the concept of SWR.